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Old November 23, 2020   #44
Fusion_power's Avatar
Join Date: Feb 2006
Location: Alabama
Posts: 2,153

VirginiaClay, I had to look up the mode of action of chlorothalonil to verify. You are correct that it is a fungicide, but it is non-systemic. Because it is not systemic, it is not effective at treating an existing fungal infection. Its mode of action is to present an impenetrable barrier on the surface of the leaf. The surface barrier prevents and kills fungal hyphae growth by blocking glutathione.

Mea culpa, I strive to learn from my mistakes!
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