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It is very important to clean your pruner by dipping in 10 % bleach solution or by spraying it with 70 % rubbing alcohol after cutting off diseased plant material and prior to pruning any healthy plants . Disease Cycle : The white fuzzy growth on the leaf surface contains thousands of fungal spores . Within two weeks , a rust-colored pustule containing spores develops in the center of each spot on the lower leaf surface . Now consider two interferograms acquired over the same region as before but at different times , so that ground deformation ( due to an earthquake or volcano swelling ) has displaced many of the resolution elements for the primed interferogram in a coherent manner . Symptoms include crowns that rot from the soil surface down and dark , felt-like fungal growth on the plant crown .