San Joaquin Valley Region

ACP Treatment Strategy

The strategy for all regions is to minimize the number of extra pesticide treatments applied for ACP in order to reduce the risk of resistance and to use the most selective insecticides or best timing to preserve the IPM program.

Initial treatment: At the first detection of ACP in your orchard, treat aggressively with a foliar pyrethroid and a systemic neonicotinoid within 2-3 weeks of detection. If one or both of these two insecticides can not be used, then use alternative ACP effective insecticides. The foliar provides rapid knockdown of the population and the systemic provides long-term suppression of the population.

Year-round suppression program: Once ACP is found, it is critical that monitoring continue after the initial treatment. To prevent resurgence of ACP, whenever you treat for another pest, choose a pesticide that will also control ACP. For example, in the San Joaquin Valley the primary pests are citrus thrips, katydid, California red scale and citricola scale. Delegate, Organophosphates, carbamates, neonicotinoids, Micromite, pyrethroids and Movento (shown in red) are insecticides applied for these pests that would assist with ACP control.

Highlighted in yellow are critical treatments applied for ACP at times of year that may not be covered by treatments for other pests. Insecticides are not normally applied during the periods of late fall and early spring. But these treatment timings have been shown to have a very strong impact on ACP populations because they attack ACP as it goes into overwintering and as it comes out of overwintering. Thus, these are important treatment additions. Pyrethroids are the most effective insecticides at these two times of year. The best timing for a systemic neonicotinoid streatment such as imidacloprid or thiamethoxam is summer, to assist with controlling the nymphs in the fall flush.