Time to act:
Sep, Oct, Nov, Jun, Jul, Aug, Apr, May
The fungus that causes this problem spreads rapidly in the warm, humid conditions of a greenhouse. It usually becomes apparent on the lowest tomato leaves from early or midsummer, which develop yellow blotches on the upper leaf surface. The leaves eventually turn brown and wither. If the problem isn't tackled, tomato yields are lower and the fungus can overwinter in the greenhouse and persist the following year.
Tomato leaves develop yellow blotches, then turn brown and wither. The crop might also be reduced.
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