Answer: I think you've learned the hard way that not all insecticides are safe to use against all pests or on all plants. To avoid this sad tale in the future, be sure the targeted pest and the plant you intend to use it on are both listed on the label. If not, it's not safe to use. As for your apricot tree, you may be able to save it by washing the residue off with soapy water and then rinsing it well. Your household bug spray probably is oil-based and the oil suffocated the leaves by blocking the natural openings; the stems and trunk of your tree can suffer the same fate unless you remove the residual oil. Hope your tree survives!
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