DIDYMELLA STEM‐ROT OF OUTDOOR TOMATOES

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Abstract
Experiments were made during 1954‐7 on the control of Didymella stem‐rot of tomatoes, by applications of various fungicides. The toxicity of a wide range of compounds to the fungus and to tomato plants was determined in the laboratory and promising compounds were then tested in the field. There were two main test methods, in both of which the plants were infected artificially at varying periods before or after treatment with the fungicides. In one method the inoculum was applied to leaf scars and in the other to the stem bases, the fungicides being sprayed on to the same sites.Of the compounds tested, maneb was the most successful, showing both eradicant and protectant properties at 1 and 2%. Captan (0.25 and 0.5%) was a good protectant but was less effective as an eradicant. Attempts were made to test the compounds under conditions of natural spread of the disease but this was so slight that the results were not conclusive.

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