Test PB Collection: FTE

Map Use the Interactive Mapping Tool to locate your orchard and determine proximity to ACP and HLB detections as well as quarantine and treatment areas.

Map Use the Interactive Map to locate your residence and determine the Asian citrus psyllid (ACP) and huanglongbing (HLB) risk in your area.

The Asian citrus psyllid adult is tiny - the size of an aphid. The wings are brown along the edge, with a clear gap along the back edge. The psyllid feeds with its rear end tilted up at a 45o angle, making the insect appear almost thorn-like on leaves and stems.

How do I find psyllids? Check your citrus trees monthly. Whenever you see tiny new leaves forming (leaf flush), look closely for signs of the psyllid. Remember the adults fly and so they may be hard to observe and the eggs are so tiny they are hard to see without a hand lens.

Tamarixia wasp parasitoid. Photo: M. Lewis The Asian citrus psyllid is attacked by many natural enemies, including lady beetles, lacewing larvae, syrphid larvae, minute pirate bugs, parasitic wasps, spiders, and birds.

Soil application of systemic insecticide by licensed applicator for sustained control of ACP.

Principles for treating commercial citrus orchards following the first appearance of ACP or where aggressive action is being taken in HLB quarantine areas: Apply two ACP effective insecticides with different modes of action as soon as possible after detection of ACP, with at least one from the broad...

Once the psyllid is found in multiple sites, in multiple stages, and it is clear that it is established in a region, the strategy becomes one of keeping ACP populations as low as possible (

See individual pesticide labels and the UC IPM guidelines for citrus for rate recommendations. Many insecticides are effective in killing psyllids, especially if they make direct contact. Synthetic Insecticides known to be effective for ACP management.

The goal: To drive psyllids below an average of 0.5 nymphs/flush. If the center row has zero nymphs, then a border only treatment between coordinated treatments could be applied to reduce psyllids below this threshold. The psyllid prefers borders and so the focus is on the outside edges of orchards.