Discussion
Which one of the following commercial products is used as a systemic fungicide to control plant diseases?
Answer: D
The systemic fungicide is Benomyl.
Benomyl, a benzimidazole, is absorbed by the plant and moved within it, so it protects new growth and can act on infections already inside the tissue. It works by binding fungal beta-tubulin and blocking mitosis.
Captan and Phaltan (folpet) are phthalimide fungicides and Thiram is a dithiocarbamate. All three are contact, protective fungicides: they stay on the surface where they are sprayed and kill spores before infection, but they are not translocated through the plant.
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