And it affects tomato fruit - especially green ones. Uncontrolled it will kill plants faster than any other disease. Petunias, which are closely related to tomatoes and potatoes, can also be infected by late blight and show similar symptoms. Copper is not very effective on late blight. Use a product that contains chlorothalonil. If you want to try to control late blight with fungicides, you need to begin spraying fungicide now – even before you see symptoms – and you need to continue spraying regularly. Leave the bag ‘cooking’ in sunlight for several hours to kill plant and pathogen, then put in the trash.įruit can rot quickly once infected, but any part not affected is safe to eat as this pathogen does not produce a toxin.
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