Not too cold or windy. If most of the leaf is brown, pull the whole leaf off instead of the tip since it won't be able to produce energy for the plant anymore. In this episode of the Beginner's Garden Podcast, I discuss these five possible causes of yellow tomato leaves, along with identifying markers, prevention measures, and what to do about each of them. There may be black streaks on petioles of some leaves. Lesions continue to grow and spread before causing leaves to fall off. At first, they turn brown at the edges, and after that, leaf turns yellow. To keep foliage dry and slow fungal growth, water the plants early in the day with a soaker hose or drip irrigation. If deficiency is severe, interveinal chlorosis progresses from the margins to the middle of the leaflets. It is a fungal disease that affects the leaves, but not the fruit. The People's Garden Workshop topic this week was tomato blights and spots, and Dr. Symptoms also include downward leaf curling and extensive necrosis. This week I noticed that two of my tomato plants had yellow-brown leaves at the bottom and certainly didn’t look as perky as I expected given the attention I have been giving them. After all the work you put into growing them, few things are as frustrating as finding brown spots on your home grown tomatoes. solani and is first observed on the plants as small, brown lesions mostly on the older foliage. Brown spot on tomato and leaves I have a Parks Whopper tomato plant. Why Are My Tomatoes Turning Brown? This time of year we have many calls about brown spots on tomatoes, squash, peppers, watermelons, etc. Enlarged spots on the leaf give the plant a frost-damaged appearance. My tomatoes have been growing really well this year, but I've just noticed some small brown spots on the leaves of one of the two plants I have. When you see tiny fruit on your tomato, cut way back on water (and fertilizer). The leaf spots are angular or irregular or delineated by the small veins. Tomato- and tobacco hornworms feed on tomato, tobacco, potato, pepper, and egg plants. angolensis, particularly on lemon leaves. These areas can quickly enlarge into spots that are up to ¼ inch in diameter, turn dark brown and become slightly raised (Figure 1). Most tomato leaf spot diseases overwinter in the soil and then splash on to the lower leaves of the plant. Greenish-brown lesions appear on the leaves, and turn from dark brown to black spots. Eggplants are more susceptible than tomato plants to injury from low temperatures and do not grow until temperatures warm. If this looks familiar, you may well be under-watering your plant. Any idea what causes this? Based on what you say, I'm going to guess your balcony has been visited by. It starts off when the plants are young and first planted and continues through the season. The plants had dying leaves and brown spots on the stems early on, but I pruned away what I could. Object Moved This document may be found here. In regards to the symptoms on the leaves of tomato plants, there is evidence of chlorosis as well as small, brown circular spots covering the leaves. Sometimes I spray my beans with Daconil when I'm spraying tomato plants for fungal diseases and I've got some left over in the sprayer. The problem usually starts as yellow spots, but eventually the spots turn brown. The surrounding leaf area may turn yellow. The tomato fruitworm feeds on tomato, corn and cotton and is also called the corn earworm or the cotton bollworm. Early blight is a common tomato disease that infects the leaves, stems and fruit. The fungus Guignardia citricarpa Kiely also causes spots on leaves and/or fruits of citrus in Africa, Asia, Australia, and South America, but leaf lesions are uncommon. Leaves may become wilted, and as the disease progresses the leaves will become brittle and appear scorched. After all the work you put into growing them, few things are as frustrating as finding brown spots on your home grown tomatoes. I thought it was being burned by too much sun, but you say 6 hours of full sun per day are needed. This is often caused by hormone weedkiller contamination, but other cases may be caused by tomato viruses. I have a question regarding curling tomato leaves as well. Symptoms begin as dark brown to purple spots on leaves. The bacteria enter plants through natural openings or wounds. Sometimes, it is natural and not a cause of worry, but all the other times, you need to pay attention. Early blight, caused by the fungus Alternaria solani, appears on the lower leaves, usually after a heavy fruit set. Early blight first appears as brown spots with dark concentric circles on lower leaves, then spreads up the plant. It causes the lower leaves to roll upward and become thick and leathery. you can notice no marks after few days of application of this mask…. Small brown spots 1/8 in in diameter (Figs 1 and 2) often appear oily on the underside of leaves. L ater, th e lesions become. Roma Tomato Help - I have a Roma tomato plant that has had full, large fruit on it for quite some time now but… Q. There may be black streaks on petioles of some leaves. The presence of thrips insects is necessary for virus transmission. Any idea what causes this? Based on what you say, I'm going to guess your balcony has been visited by. Stem lesion with sporulation of the pathogen. May be used up to day before harvest. Leaves turn brown and wilt when plants have too little and too much water. EARLY BLIGHT is a common leaf spot caused by the fungus Alternaria solani. Some of the more common yet preventable and/or curable diseases of tomato plants are early blight, powdery mildew and viruses. Brown, leathery spots on the top and sides of fruit. Marks are enlarged when conditions are wet and become reddish-brown spots when conditions are dry. Tomato Plant Leaves Brown Spots For Hostas Good find fertilizer quantities in dry weight or ppm for the aquarium. The root cause (pun intended) of brown rot on the end of tomatoes is low calcium levels in the plant. Individual leaf spots are nearly circular, measuring 3-5 mm in diameter at maturity. long and found three to four inches deep in the soil. I have these dark brown spots on my tomato leaves that appeared over the weekend. The affected leaves are on the upper half of the plant, and I do not see any spots on the back side of the leaves. You can spray with preventive fungicides to keep the problem from becoming too severe. Leaves on the lower branches of tomato plants are typically affected with brown spots, followed by yellowing or browning of the leaves. Peony leaf blotch is probably responsible for the large, brown spots. Yellowing leaves on tomato plants could indicate something as simple as too much water or something serious, for instance, a pest. L ater, th e lesions become. Late blight: Late blight appears as irregular blue-gray patches on the leaves and fruit that turn brown and then black. Sometimes the lesion border is yellow or has a water-soaked appearance. The leaves quickly developed some brown spots. I believe this may have been caused by composting rose bush leaves in my tomato garden in past years. Signs of bacterial leaf spot of tomato begin as small, irregular brown spots. A blueberry with iron deficiency has yellowing leaves with dark green veins, the new growth will be affected by this first. Rinse it with warm water and dry your skin. If tiny, greyish-brown dots cover your tomato leaves, Septoria leaf spot is to blame. Eventually, the spots develop gray to tan centers with darker borders. Identifying the cause of a problem is necessary before appropriate management methods can be taken. Sometimes, it's not a big. Robert Bridwell Tomato Plant Leaves Brown Spots Coron Nitrogen. Wilted leaves mean the same. Well, not to worry anymore. Not all 'leaf blights' of tomato and potato are late blight! Several common diseases of tomato and potato cause leaf symptoms that can easily be confused with late blight. Once tomato plants become sturdy enough, you should stake them for further support. And as you’ll see below, this simple recipe can also be. This past two weeks I have noticed some of my tomato leaves have been curling up. Large lesions may also develop on the fruit. Spots on fruit will first appear as raised black spots that will later become large sunken scab-like areas. What are these spots and what should I do about them? My tomato plant is in a large pot of regular potting. The spots look chalky in appearance, and seem to be spreading. This is often caused by hormone weedkiller contamination, but other cases may be caused by tomato viruses. In most people's minds, purple tomato leaves are the result of nutritional. you may be able to help the plants by removing some of the worst damaged leaves (discard those, don't compost. Stop fertilizing tomatoes when the plants stop blooming. The plants has a branching stem and simple, long, flat. Spots enlarge and concentric rings in a bull's-eye pattern may be seen in the center of the diseased area. Spots first appear on older leaves near the base of the plant. Yellow leaves that have purple, distorted veins are a sign that psyllids have infested the tomato plant. Don’t worry that white powder is not cocaine, it’s powdery mildew. My tomato plants' leaves are brown and dying. The tomato fruitworm (Helicoverpa zea) is the most damaging tomato insect pest in South Carolina. Not enough water (or too much!) Check out the dry stems and brown lower leaves on the tradescantia ‘wandering jew’ in the photo, above. If the soil is allowed to get dry during a hot spell, the tomato plant will not be able to provide its ripening fruit with all the water it needs and the tomato itself will start to die, starting at the blossom end of the tomato. Cause of Black Spots on Tomatoes. It doesn't seem to be spreading, and the stems are firm. My tomatoes have been growing really well this year, but I've just noticed some small brown spots on the leaves of one of the two plants I have. Necrotic spots may appear on peduncles, calyces and petioles. On unripe, green fruits, the spots often have darker green haloes, while on ripe fruits the spots can have subtle, yellow haloes. The trick is. Septoria leaf spot is caused by a fungus, Septoria lycopersici. Leaf spots that appear on the lower surface of older leaves as small, pimples and on the upper leaf surface as small water-soaked spots are a symptom of bacterial spot. If you see black spots on your tomatoes then you are most likely dealing with a condition called blossom end rots. Bright yellowish spots, approximately ½" in diameter, develop and may grow together. It starts out looking like little white powder spots on the top and undersides of your cucumber, zucchini, squash and melon plants. 25 inches and have a tan or gray center. I have removed all leaves that show signs of rust - the younger leaves seem fine at the moment. The leaves can dry and curl although in moist conditions a white fungal growth can occur around the edges. Symptoms of magnesium deficiency start on older leaves. If your tomato plants have unusual brown or gray spots on the underside of leaves, then you may have a gray leaf spot problem. This is a soil borne bacterial infection, and under the correct conditions will cause yellow blotches on the tomato's leaves, then the appearance of brown veins culminating in dead spots of a chocolate brown. Tomato fungus, also called blight, is the bane of tomato plant (Solanum lycopersicum) gardners everywhere. FULL TEXT Abstract: Tomato spotted wilt virus (TSWV) is one of the most destructive viral pathogens of plants. For O 2 •− detection, the other leaf samples were immersed with 1 mg·mL − 1 NBT solution, which was made with 10 mM phosphate buffer (pH 7. Treat tomato plants with neem oil every 3 days to destroy the eggs. So Many Spots. Keep it out of the garden. Black spot leaf disease shows itself first with black spots appearing on the leaf, then with rings of yellow as the spots grow, until the leaf turns entirely yellow and then falls off. Look for these red flags on your tomato leaves to quickly identify problems. These areas can quickly enlarge into spots that are up to ¼ inch in diameter, turn dark brown and become slightly raised (Figure 1). Brown spots on tomato plant leaves are a symptom of bacterial and fungal plant diseases. Brown to blackish lesions also develop on upper stems. By using this site you agree to these cookies being set. Filed Under: solar fertilizer posted by Dr. As soon as black spots appear on leaves, you should prepare for this worst of tomato blights: downy mildew. Peony leaf blotch is caused by the fungus Cladosporium paeoniae. Symptoms also include downward leaf curling and extensive necrosis. Identifiy: Appearing as tiny, round splotches on the leaves, this tomato disease (Septoria lycopersici) typically starts on the lowest leaves first. The root cause (pun intended) of brown rot on the end of tomatoes is low calcium levels in the plant. 4 answers 4. Do I have aphids or what could be causing this? Hi Cindy Its possible that your mandevilla has a leaf spot disease caused by a fungus (Cercospera). The nearest I can tell, it looks like spotted. Solution: Disease can be carried on seed so only sow disease-free seed. Brown spots are typically caused by fungus or nutritional deficiencies. On the tops of the leaves, yellow spots surface amidst the white ones. If deficiency is severe, interveinal chlorosis progresses from the margins to the middle of the leaflets. I have noticed the leaves yellowing with black spots. Lesson is, reduce extreme swings in moisture – avoid allowing them to wilt or overwatering tomato plants. Although the diseases are caused by different spores, the end result is the same. Treat tomato plants with neem oil every 3 days to destroy the eggs. The spots are generally uniform in size and sometimes emit a sticky substance. When troubleshooting any new or strange foliage spots and marks, it’s always a good idea to recall what may have been sprayed on the plants in the previous few days or keep a journal of products used, the rate and date of application. IF YOU HAVE LARGE ROTTEN SPOTS or yellow leaves go to this post HERE. The symptoms were not quite what we had seen before, but laboratory tests confirmed that the cause was Tomato Spotted Wilt Virus. You should also have tomato plants. The Scotts Miracle-Gro Company , the worlds leading marketer of branded consumer lawn and garden as well as hydroponic growing products, Lowest price on better gro orchid. The presence of fruiting bodies of the fungus, visible as tiny black specks in the centers of the spots, confirms Septoria leaf spot. Any ideas? Also, what do overfertilized vegetable leaves look like?. Check out our visual guide to help you figure out what is wrong with your tomato plant leaves. Remove and destroy infected material. Older spots are black, slightly raised, superficial and measure up to 0. When the problem is brown leaves, the spots are dark brown to black. Mild cases may be caused. As a stop-gap measure, spray tomato plants with a calcium solution made for blossom-end rot. Symptoms also include downward leaf curling and extensive necrosis. February 25th 2009 In Search of the Perfect Tomato 'Persimmon' (possibly the best tomato I. The leaf. Fungal leaf spot infections tend to develop in humid, moist conditions and the spores are easily spread by wind and splashes of water. Additionally, dark, sunken lesions appear on the stems, often starting near the soil in young plants. Tomato & Vegetable 3-in-1 RTU Kills aphids, mites, bugs, scale, caterpillars, whitefly, thrips, plus scab, rust, powdery mildew, leaf spots, blight, brown rot and other listed insects and diseases. The infection starts off as small circular to irregularly shaped spots that are greasy in appearance. They are up to 6 mm in diameter. TOMATO FRUIT Potassium deficiency. Early blight, caused by the fungus Alternaria solani, appears on the lower leaves, usually after a heavy fruit set. I give them about 16-18 liters of water a day, sometimes twice (morning and evening) if it's a. Once I noticed the deficiency in my tomato plants, I went out and bought some Epsom Salt. I am having problems with yellowing and dying leaves. The mature larvae grow up to 20 mm long, are yellowish-green with several rows of dark spots along the body and a dark head. Brown spots on tomato plants. In this episode of the Beginner’s Garden Podcast, I discuss these five possible causes of yellow tomato leaves, along with identifying markers, prevention measures, and what to do about each of them. And as you’ll see below, this simple recipe can also be. Tomato end rot starts as a small brown spot on the bottom of the fruit and enlarges to cover the entire end of the tomato. One plant is also yellowing on the leaves, almost potassium deficiency symptoms. And are the spots on lots of the leaves or just a few? All the plants, most or just a few? And have spuds or tomatoes been grown in the same patch within the last four years? I'm asking these questions because black spots on potato leaves *could* be the starting sign of blight. Brown spots on walnut tree & tomato leaves. The leaves are small and thin, have high fall color, and drop early. Tomato leaves and stems will turn dark and this will work it's way to the main stem and kill the entire plant. Do I have aphids or what could be causing this? Hi Cindy Its possible that your mandevilla has a leaf spot disease caused by a fungus (Cercospera). Symptom : Disease or Condition : Small, chocolate-brown circular spots that first appear in the terminal of the plant. The disease is seed and soilborne. The affected leaves are on the upper half of the plant, and I do not see any spots on the back side of the leaves. Symptoms of magnesium deficiency start on older leaves. Under dry conditions the spots have a speckled appearance. It was doing fine but as soon as the tomatoes were ready to ripen, I noticed brown spots at the bottom of the tomato and brown spots on the leaves, which turned yellow and then started dying off towards the stem. Fruit production is inhibited. Disease onset and progression are usually very rapid. If this looks familiar, you may well be under-watering your plant. If you don't think fluctuation in moisture is the cause, get your soil tested. Early Blight - Also known as alternaria leaf spot, early blight is a fungal disease that results in leaf spots and stem and fruit lesions. A new tobamovirus isolate infects tomato plants in Israel. Tomato diseases and disorders | Diseases in outdoor production 5 Figure 12. Mild cases may be caused. There are also soilborne fungi that can cause leaf yellowing on tomatoes. The spots look chalky in appearance, and seem to be spreading. To keep foliage dry and slow fungal growth, water the plants early in the day with a soaker hose or drip irrigation. The center of the leaf spots often falls out resulting in small holes. Lesson is, reduce extreme swings in moisture - avoid allowing them to wilt or overwatering tomato plants. Was nice and green and so healthy looking I was so proud of it but now it looks all dried up, the leaves are turning brown with black spots all over the leaves. They are best watered with a drip system or use care in other methods not to splash leaves near ground level. Brown spots are typically caused by fungus or nutritional deficiencies. Eventually, the pustules break open and release spores that are spread by wind or splashing water. One plant is also yellowing on the leaves, almost potassium deficiency symptoms. After all the work you put into growing them, few things are as frustrating as finding brown spots on your home grown tomatoes. The fungal growth may appear on the lower leaf surface later. Recently, however, the disease has increasingly been found in home gardens. Make sure to carefully bag up and remove all portions of the plant from your garden. If you don't think fluctuation in moisture is the cause, get your soil tested. Concentric rings develop in the spot forming a bull’s eye. This disease is caused by the fungi Alternaria tomatophila and A. I sprayed it with a pyrethrin-based product and the new top leaves look like they're okay. As the disease gets worse the spots on the leaves will turn brown with yellow edges. Treatment involves looking on the bottom of leaves for insects, removing them and applying a pesticide to the growing area. If a magnesium deficiency is left untreated, the leaves will eventually turn yellow, and the veins, and the leaves will die and fall off. 6 Replies 1896 Views August 11, 2007, 00:25 by WG. Discolouration of the leaves, turning them brown from the edges inwards. When the bottom leaves of a tomato plant turn yellow with brown spots, early blight is usually the culprit. Any idea what causes this? Based on what you say, I'm going to guess your balcony has been visited by. Our articles, articles. Stop fertilizing tomatoes when the plants stop blooming. My tomato plants grow to about two feet high, then the leaves develop brown and yellow spots, and die from the bottom up. Identifiy: Appearing as tiny, round splotches on the leaves, this tomato disease (Septoria lycopersici) typically starts on the lowest leaves first. They usually measure between 1. Irregular ripening (whitefly) irregular ripening of fruit resulting from heavy whitefly occurrence on plant. On tomato leaves, the disease first appears as small, brown spots with light brown centers and darker brown margins (Figure 6). Leaf spot disease I have Mandevilla plants in large pots on each side of my spa on the pool decking. It appears on leaves as discolored, yellowish spots that have a fuzzy, powder-like substance on top of them. Tomato Fungicide Recommendations. If deficiency is severe, interveinal chlorosis progresses from the margins to the middle of the leaflets. Identifying the cause of a problem is necessary before appropriate management methods can be taken. You should also have tomato plants. Tomato Fungicide Recommendations. But the symptoms are pretty varied. When the bottom leaves of a tomato plant turn yellow with brown spots, early blight is usually the culprit. Individual leaf spots are nearly circular, measuring 3-5 mm in diameter at maturity. In other cases, the leaves had scattered small brown spots, particularly toward their stems. The lower leaves are probably yellowing because of a lack of fertilizer, a. Tomato plants should be fed every 10 days when they're growing up and every two weeks while blooming and setting fruit. I've noticed over the last few weeks that the leaves on my tomatoes, which are mostly heirloom varieties, have developed brown spots which eventually turn necrotic. Photo: Suzanne. Conditions leading to tomato blight. There are three type of blights that can be very harmful for a healthy plant and is the reason for the spots on the leaves as well. Spots that appear on leaves and stems are small (up to 1⁄ 8 inch across), circular to irregular in shape, and have. early blight appears as black or brown patches on the leaves and fruit of "Natural Remedies for Black Spots on Tomato Plants" last. Brown Spots on Leaves—Anthracnose: In hot, humid weather, anthracnose can infect the leaves, stems, and fruit of cucumbers. Small, round, reddish brown spots with white to grayish white centers form on th e upper l eaf sur face. Tomato None Given. It starts out looking like little white powder spots on the top and undersides of your cucumber, zucchini, squash and melon plants. Spots generally have a series of concentric circles. The most likely pest culprit is the hornworm, which you can hand pick. Spots may also appear on seedling stems and fruit pedicels. The fungus Guignardia citricarpa Kiely also causes spots on leaves and/or fruits of citrus in Africa, Asia, Australia, and South America, but leaf lesions are uncommon. What causes it: A fungus called Alternaria solani. EARLY BLIGHT is a common leaf spot caused by the fungus Alternaria solani. Not enough water (or too much!) Check out the dry stems and brown lower leaves on the tradescantia ‘wandering jew’ in the photo, above. Wild tomato frogs tend to eat small insects and invertebrates. The first leaves that are affected are typically toward the bottom of the plant. Otherwise it can spread. This is usually caused by variable temperatures at night or aphid attack. What it looks like: You'll find brown spots on tomato leaves, starting with the older ones. Septoria leaf spot also develops first on the older, lower leaves and can cause complete defoliation in a relatively short period of time. Leaf spot margins often are pale green or water-soaked. Cool and wet weather favor the development of Anthracnose. vesicatoria): The bacterium causes spots on both foliage and fruit. They show interveinal chlorosis on the leaf margins and some whitish to light brown necrotic dots. Well, not to worry anymore. Dark brown spots with broad yellow haloes appear on the leaves, and concentric rings can be found in the spots under bright light. Abnormal color changes on your tomato plant should throw up a warning flag for you. Symptoms such as brown spots on leaves and leaf edges can be seen on chilled African violets, philodendrons, syngoniums and sansevierias. May remain attached to the plant for a week or more; In severe cases, stems shrivel and turn brown or black. Septoria leaf spot is caused by a fungus, Septoria lycopersici. Bacterial spot of tomato and pepper. I've noticed over the last few weeks that the leaves on my tomatoes, which are mostly heirloom varieties, have developed brown spots which eventually turn necrotic. Sometimes, it's not a big. These spots have a dark brown margin compared with early blight’s yellow halo. The pepper plants, which were growing really slowly but didn't look all that unhealthy, have sprouted many new leaves as well. chocolate brown, circular spots that are 1/10 to 1/8 inch in diameter (Figure 2). These areas can quickly enlarge into spots that are up to ¼ inch in diameter, turn dark brown and become slightly raised (Figure 1). Pale, Yellowing Leaves Caused by Nitrogen Deficiency Suspect a nitrogen deficiency if the leaves low on the stems of tomato plants turn yellow, dry and curl. Brown spots on walnut tree & tomato leaves. Natural Remedies for Black Spots on Tomato Plants. Plants develop a distinct purpling of the stem, petiole and the under sides of the leaves. As the disease gets worse the spots on the leaves will turn brown with yellow edges. Eggplant, Solanum melongena, is a tropical, herbaceous, perennial plant, closely related to tomato, in the family Solanaceae which is grown for its edible fruit. Brown spots on the leaves of your tomato plant can indicate several disease possibilities, generally caused by fungi. The reddish color often found on the underside of the leaves and the petioles has a more pinkish tone and is much less vivid than that found in nitrogen deficiency. The leaf. The stems will develop black and brown spots that eventually spread. Click on links below to jump to that question. It is a fungal disease that affects the leaves, but not the fruit. Here are 4 common problems with tomatoes during the summer – and tips. Here is a list of what you might see on and around your tomato plants. What IS critical to understand is how it affects your plants. This disease is caused by the fungi Alternaria tomatophila and A. Leaves turn yellow around the brown spots, then the entire leaf turns brown and falls off. Moths lay oval, creamy yellow eggs near flower buds. Bacterial spot on leaflet Bacterial spot Bacterial spot, caused by the bacterium Xanthomonas campestris pv. My tomatoes have been growing really well this year, but I've just noticed some small brown spots on the leaves of one of the two plants I have. You can also grow a cover crop to help build the soil. When the bottom leaves of a tomato plant turn yellow with brown spots, early blight is usually the culprit. I'm only seeing them on one branch. The leaves will eventually die and break off. Roma Tomato Help - I have a Roma tomato plant that has had full, large fruit on it for quite some time now but… Q. On the tops of the leaves, yellow spots surface amidst the white ones. This past two weeks I have noticed some of my tomato leaves have been curling up. Round to irregular spotting of leaves also occurs. If this is the case, you will want to. To keep foliage dry and slow fungal growth, water the plants early in the day with a soaker hose or drip irrigation. By using this site you agree to these cookies being set. Since I did not known to be on the look-out for these nasty worms, they had been allowed to feed until quite large and plump, and finally nearly killing my tomato plants in the process. The blight will destroy the leaves and reduce the vigour of the plants. Leaves, stems and fruit may be infected at any growth stage when plants are wet and temperatures range from 75 F to 86 F. The key to maintaining healthy tomatoes. The infection starts off as small circular to irregularly shaped spots that are greasy in appearance. Mose or Ikram non-grafted or grafted on 'Arnold' rootstock were discovered in October 2014 in six net houses (30 acres total) of a single farm at Ohad village in Southern Israel. I've grown tomatoes a long time and I've never seen this problem before. Early Blight – Also known as alternaria leaf spot, early blight is a fungal disease that results in leaf spots and stem and fruit lesions. Favored by mild, wet weather. What's wrong with my tomato plant? We have the answer. The symptoms of the tomato fruit exterior include larger, brown circular deformations on the plant's exterior skin. Curling leaves. But what if your maple leaves develop unsightly brown or black spots in summer? Is your tree in trouble–or even a goner?. tomato plants is yellowing leaves that develop brown spots, usually caused by a fungal infection. Note the small black microsclerotia of Verticillium dahliae in the vascular tissue of the infected plant. Diagnosis is the first step in disease management. Disease severity is increased by leaf wetness from sprinkler irrigation, rain, or heavy dews. This is not a long-term fix, but it may salvage your crop until you can take the steps mentioned above. My tomato plants grow to about two feet high, then the leaves develop brown and yellow spots, and die from the bottom up. Symptoms include many small, circular, dark spots on the leaves that have grayish centers and dark brown margins. Infected plants have brown or black water-soaked spots on the foliage, sometimes with a yellow halo, usually uniform in size. Bacterial speck Tiny, dark brown circular spots that develop yellow rings Bacterial spot Same as above Freeze damage Water-soaked blotches that turn black Edema Dark, raised spots on upper surfaces coused by excessive moisture Purplish leaves Tomato spotted wilt virus Flecking or irregular lesions on upper leaf surface. Since pH is not the reason for the brown spots, feeding additives to your dog will not stop the brown spots and can actually be harmful to your dog. The blight will destroy the leaves and reduce the vigour of the plants. The new growth was spotless and the plants after 3 weeks are healthy as heck. Leaf symptoms of bacterial speck can be hard to distinguish from other tomato diseases. As tomato plants grow, keep an eye out for tomato pests and tomato plant diseases such as tomato wilt that may come in the form of fungi, bacteria, or viruses.