I live in southern California and have 2 grapevines that are very green and leafy and growing! They are requiring a lot of maintenance though due to pests. =/ There are purple flies that are laying eggs on the leaves. From the eggs come small black and yellow striped caterpillars that demolish the leaves. Last year I tried Organocide and that was unsuccessful so this year I have been very diligent about checking the leaves and removing them when they have eggs/maggots on them. They give me the heebiejeebies! So gross!! Besides hoping to find an easier solution, I'm going on vacation and am afraid I'm going to come home to an infestation. Please help!!