Key to Tomato Diseases

Crown Gall

Use the following key to help locate potential causes by following the links which best describe where and what one is observing.

DISEASES AFFECTING LEAVES AND STEMS, WITH OR WITHOUT SYMPTOMS ON FRUIT

• A. Disease characterized by wilting of plant, without definite leaf spots; with or without spotting or decay of fruit.

• B. Diseases characterized by leaf spots but no wilting of plant; with little or no spotting of the fruits.

• C. Diseases characterized by leaf spots and spotting or decay of fruits, but no wilting of plant.

• D. Diseases characterized by mottling, yellowing, curling or malformation of leaflets and usually by more or less stunting of the plant; with or without symptoms on the fruit.

DISEASES AFFECTING ONLY THE FRUIT

• A. Diseases characterized by rotting of the fruit

• B. Diseases characterized by cracking, spotting or malformation of fruits, but by no rot (secondary infections may be present).

******* DISCLAIMER *******

This by no way covers every disease. This is just a guide. It should cover some of the most common diseases in the US and other countries. Virus diseases are often difficult to distinguish and many exist. Consult a county extension person or garden center for accurate assessment of diseases in your area. This document was developed by Keith Mueller to be used as a guide. The author is not responsible for descisions made by readers regarding the diagnosis or treatment of crops.