Lime sulfur is a pretty safe and effective pesticide, if used properly. However, it is a surface protectant, with no systemic action whatsoever. Therefore, using it prophyllactically at the beginning of winter makes very little sense- it will be worn off
by rain and wind long before any pest is active. It makes more sense to spray trees in early spring, before hot weather, but when fungi and insects are beginning to stir. And I wouldn't use it then unless I knew I was facing an inevitable foe: for insta
nce, cedar apple rust on my rosaceous bonsai, which need protection in early spring, just as leaves are unfurling. Lime sulfur is perfect for that.

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