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The symptoms presented on a real plant sample can be compared with the photos in this guide to identify possible causes. The booklet is organized into two broad sections, one showing the common insect pests that attack the crop and the other showing the various symptoms of poor health.
Inspect plants for characteristic damaged symptoms (e.g. the blotch-shaped mines in the leaves, puncture marks on fruits, exit holes, frass). The action threshold is 2 larvae per plant for greenhouse production and 3 larvae per plant for open field production or about 8% defoliation.
EARLY BLIGHT is a common leaf spot caused by the fungus Alternaria solani. Dark brown spots with broad Dark brown spots with broad yellow haloes appear on the leaves, and concentric rings can be found in the spots under bright light.
Throughout Compendium of Tomato Diseases and Pests, diseases and disorders are discussed in sections that follow a consistent structure: a statement of the importance and dis-tribution of the disease or disorder, identification of its com-mon signs and symptoms, description of its causal organism or
Tomato Spotted Wilt is caused by a Tospovirus TSWV and is vectored by various thrips species. A combination of symptoms can provide a definitive confirmation. Wilting, Curling and Purpling of leaves. Black/Purplish patterns on the leaves. Small purplish spots coalesce on leaves.
Septoria leaf spot is probably the most common foliar disease of field-grown tomatoes in the northeast. Bacterial speck, early blight and bacterial canker are also common. Protected tomatoes are most commonly affected by leaf mold and gray mold, which occur rarely in the field. Powdery mildew and white mold occur in both production systems.
Use drip irrigation or soaker hose. Water in the morning so leaves dry quickly in the sun. Stake or cage plants. Space plants so that air flows between plants. Mulch all exposed soil with plastic or organic mulch. Scout Tomato Plants Once a Week. Look at lower leaves for leaf spots.
