Tomato Pests And Diseases Pdf

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Tomatoes Solanum lycopersicum can be grown on almost any moderately well-drained soil type. A good supply of organic matter can increase yield and reduce production problems. Tomatoes and related vegetables, such as potatoes, peppers and eggplants, should not be planted on the same land more than once in three years.

Tomato Diseases: A Colour Handbook

Tomatoes Solanum lycopersicum can be grown on almost any moderately well-drained soil type. A good supply of organic matter can increase yield and reduce production problems. Tomatoes and related vegetables, such as potatoes, peppers and eggplants, should not be planted on the same land more than once in three years.

Ideally, any cover crop or crop preceding tomatoes should be members of the grass family. Corn, an excellent rotation crop with tomatoes, supplies large amounts of organic matter and does not promote the growth of disease organisms that attack tomatoes.

Certified seeds and plants are recommended and should be used whenever possible. Bacterial wilt Ralstonia solanacearum causing a rapid wilting of tomato plants.

Bacterial wilt or Southern bacterial blight is a serious disease caused by Ralstonia solanacearum formerly Pseudomonas solanacearum. This bacterium survives in the soil for extended periods and enters the roots through wounds made by transplanting, cultivation or insects and through natural wounds where secondary roots emerge.

Disease development is favored by high temperatures and high moisture. The bacteria multiply rapidly inside the water-conducting tissue of the plant, filling it with slime. This results in a rapid wilt of the plant, while the leaves stay green. If an infected stem is cut crosswise, it will look brown and tiny drops of yellowish ooze may be visible.

Rotation with non-susceptible plants, such as corn, beans and cabbage, for at least three years provides some control. Do not use pepper, eggplant, potato, sunflower or cosmos in this rotation. Remove and destroy all infected plant material. Plant only certified disease-free plants. The cultivar Kewalo is partially resistant to bacterial wilt, but is an uncommon cultivar.

Chemical control is not available for this disease. Early blight Alternaria species on tomato foliage. Tissue surrounding the spots may turn yellow. If high temperature and humidity occur at this time, much of the foliage is killed. Lesions on the stems are similar to those on leaves and sometimes girdle the plant if they occur near the soil line collar rot. On the fruits, lesions attain considerable size, usually involving nearly the entire fruit. Concentric rings are also present on the fruit.

Infected fruit frequently drops. The fungus survives on infected debris in the soil, on seed, on volunteer tomato plants and other solanaceous hosts, such as Irish potato, eggplant, and black nightshade. Use pathogen-free seed and do not set diseased plants in the field. Trim off and dispose of infected lower branches and leaves. To reduce disease severity, test the garden soil annually and maintain a sufficient level of potassium. Side dress tomato plants monthly with calcium nitrate for adequate growth.

If disease is severe enough to warrant chemical control, select one of the following fungicides: mancozeb very good ; chlorothalonil or copper fungicides good. Follow the directions on the label. See Table 1 for examples of fungicide products for home garden use. See Table 2 for tomato cultivars with resistance or tolerance to early blight. Late blight is a potentially serious disease of potato and tomato, caused by the fungus Phytophthora infestans.

Late blight is especially damaging during cool, wet weather. The fungus can affect all plant parts. Young leaf lesions are small and appear as dark, water-soaked spots. These leaf spots will quickly enlarge and a white mold will appear at the margins of the affected area on the lower surface of leaves. Complete defoliation browning and shriveling of leaves and stems can occur within 14 days from the first symptoms.

Infected tomato fruits develop shiny, dark or olive-colored lesions, which may cover large areas. Fungal spores are spread between plants and gardens by rain and wind. Septoria leaf spot Septoria lycopersici on tomato. This destructive disease of tomato foliage, petioles and stems fruit is not infected is caused by the fungus Septoria lycopersici. Infection usually occurs on the lower leaves near the ground, after plants begin to set fruit.

Numerous small, circular spots with dark borders surrounding a beige-colored center appear on the older leaves. Tiny black specks, which are spore-producing bodies, can be seen in the center of the spots. Severely spotted leaves turn yellow, die and fall off the plant. Defoliation weakens the plant, reduces the size and quality of the fruit, and exposes the fruit to sunscald see below. The fungus is not soil-borne, but can overwinter on crop residue from previous crops, decaying vegetation and some wild hosts related to tomato.

Crop rotation of 3 years and sanitation removal of crop debris will reduce the amount of inoculum. Do not use over-head irrigation. Repeated fungicide applications with chlorothalonil very good or copper fungicide, or mancozeb good will keep the disease in check. Leaf mold Fulvia fulva on tomato foliage. It is first observed on older leaves near the soil where air movement is poor and humidity is high.

The initial symptoms are pale green or yellowish spots on the upper leaf surface, which enlarge and turn a distinctive yellow. Under humid conditions the spots on the lower leaf surfaces become covered with a gray, velvety growth of the spores produced by the fungus.

When infection is severe, the spots coalesce, and the foliage is killed. Occasionally, the fungus attacks stems, blossoms and fruits. Green and mature fruit can have a black, leathery rot on the stem end. Leaf mold Fulvia fulva on lower leaf surface.

The fungus survives on crop residue and in the soil. Spores are spread by rain, wind or tools. Seeds can be contaminated. The fungus is dependent on high relative humidity and high temperature for disease development. Staking and pruning to increase air circulation helps to control the disease. Avoid wetting leaves when watering. Rotate with vegetables other than tomatoes. Using a preventative fungicide program with chlorothalonil, mancozeb or copper fungicide, can control the disease.

See Table 1 for fungicide products for home garden use. This disease is caused by the bacterium Xanthomonas vesicatoria , which attacks green but not red tomatoes. Peppers are also attacked. The disease is more prevalent during wet seasons. Damage to the plants includes leaf and fruit spots, which result in reduced yields, defoliation and sun- scalded fruit.

The symptoms consist of numerous small, angular to irregular, water-soaked spots on the leaves and slightly raised to scabby spots on the fruits. The leaf spots may have a yellow halo.

The centers dry out and frequently tear. Bacterial Spot Xanthomonas vesicatoria symptoms on tomato leaves. The bacteria survive the winter on volunteer tomato plants and on infected plant debris.

Moist weather is conducive to disease development. Most outbreaks of the disease can be traced back to heavy rainstorms that occurred in the area. Infection of leaves occurs through natural openings. Infection of fruits must occur through insect punctures or other mechanical injury. Bacterial spot is difficult to control once it appears in the field. Any water movement from one leaf or plant to another, such as splashing rain drops, overhead irrigation, and touching or handling wet plants, may spread the bacteria from diseased to healthy plants.

Avoid areas that were planted with peppers or tomatoes during the previous year. Avoid overhead watering by using drip or furrow irrigation. Remove all diseased plant material. Prune plants to promote air circulation.

Spraying with a copper fungicide will give fairly good control the bacterial disease. Follow the instructions on the label. Tomato pith necrosis is usually an early season disease that occurs in greenhouse and high tunnel tomato production.

However, during cool and rainy spring weather, tomato pith necrosis may infect tomatoes and occasionally peppers in home vegetable gardens. Pith necrosis is caused by multiple species of soil-borne Pseudomonas bacteria, including Pseudomonas corrugata , as well as Pectobacterium carotovorum.

These bacteria are considered weak pathogens that infect rapidly growing tomato plants during cloudy, cool, and moist environmental conditions. With tomato pith necrosis, brown necrotic areas on stems often begin where leaves attach and spread down the adjacent leaf petiole.

Symptoms: The early symptoms of this disease are blackened necrotic areas on the stems, which may first appear adjacent to leaf petioles. The blacken areas coalesce and extend as a band along the stem, as well as out onto the leaf petioles.

Tomato Diseases

This post may contain affiliate links. If you click on an affiliate link and make a purchase, we receive a small commission at no extra cost to you. Find our full disclosure here. Tomato growers are a passionate bunch. Some of us spend long hours combing over seed catalogs and nursery benches full of plants to select the perfect tomato varieties for our garden.

Content Content 1. Diseases - Fungal. Pests - Insects. See questions about Tomato. Tomato flower.

Tomato Diseases & Disorders

All dis- ease problems derive from the interaction of many factors. Pictures from the Spinach Conference; Spinach Conference. New to this guide are … Identification and management of tomato diseases is an important step in obtaining a successful tomato harvest. Tomato Diseases to Treat.

Number of living whitefly larvae on tomato leaves, 7 days after fourth application. Even if tomato insect damage is nominal, the pests themselves often are vectors for disease. Aphids will be soft-bodied insects usually showing up on the undersides of the leaves. Always try less toxic alternative sprays first for the control of insect pests and diseases.

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Tomato Diseases & Disorders

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2 Response
  1. Olivia F.

    Several tomato diseases have been identified, however the most significant were seedling damping-off (Pythium sp, Fusarium sp, Rhizoctonia solani), plant wilting (Fusarium oxyporum and Ralstonia solanacerum), fruit anthracnose (Colletotrichum sp.), apical necrosis and root-knot nematode (Meloidogyne sp.).

  2. Ariel M.

    This is the definitive work on the diseases and disorders of the tomato, a worldwide crop of significant economic importance.

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