Whiteflies are tiny, sap-sucking insects that are frequently abundant in vegetable and ornamental plantings.They excrete sticky honeydew and cause yellowing or death of leaves. Outbreaks often occur when the natural biological control is disrupted. Management is difficult. (UC IPM)
Control is difficult to achieve when populations have multiplied creating an outbreak. This usually occurs by mid to late summer. If treated before large outbreaks occur, nuisance sap and cotton candy build up can be avoided. Early season applications of systemic pesticide either by trunk or soil injection, will help prevent these outbreaks. This method of application will help prevent disruption of many natural, “beneficial” insect populations.
We always want to remind you that insect and disease problems indicate problems with the growing environment. A site assessment should be performed to help determine if and how a tree can be preserved.