Answer: Without knowing the pest, it's difficult to recommend a control. Not all insecticides work against all pests. Otherwise healthy trees can withstand 20% damage to the canopy without problem. No treatment should be required at this point. Try to capture whatever is gnawing on the leaves and take it into your local Cooperative Extension office (408-299-2635) for identification. Once you know what you're dealing with, you can decide whether or not the potential damage warrants control.
Avocado trees do not need regular fertilizing. Feed only if growth is slow or leaf color is pale.
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