Search results
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.
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.
Dark brown spots with broad yellow haloes appear on the leaves, and concentric rings can be found in the spots under bright light. Stems and fruit can also be infected. It often progresses from the bottom of the plant upward.
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.
symptoms of important tomato diseases and pests occurring throughout the world—in the greenhouse, in the field, and in transit to the market. This presentation of text and illustrations will support individuals with both broad and limited experience in making accurate diagnoses of tomato diseases and disorders. Acknowledgments
Bacterial Spot. Plant tomatoes where no tomatoes, potatoes, peppers, or eggplants have been for the past 3-4 years. Keep tomato leaves as dry as possible. 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.
This guide lists the most common foliar problems of tomatoes (for problems on fruit, see our Visual Guide: Tomato Fruit Problems), but preventing problems is usually easier than curing them.
