Q. What is the white deposit on the leaves of your plants?
A. It is primarily Thiram (Thianosan) which is a broad-spectrum fungicide that has the very useful side-effect of killing (or preventing) moss, liverwort and general green gunge. Because we water all our crops from underneath the deposits do not get washed off and although in the growing season the plants tend to shed the deposits as the leaves grow this does not happen in the winter or with the oldest leaves. If you are using overhead irrigation the deposits will quickly disappear.
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