Asian citrus psyllid (ACP) matters because it can spread the bacterium associated with huanglongbing (HLB), also called citrus greening.
What ACP looks like
Adults are small aphidlike insects that characteristically feed at an angle with the head down. Yellowish nymphs occur on tender new growth and can produce white waxy tubules.
HLB warning signs
Warning signs can include asymmetrical blotchy yellow mottling, small or lopsided fruit, poor coloration, premature fruit drop and bitter fruit. These symptoms can overlap other problems, so a photograph alone should not be treated as confirmation.
Why identification matters
ACP feeding itself can distort new growth, but its disease-vector role is the major concern. HLB has no known cure, making official identification and regional management important.
California reference
See UC IPM: Asian Citrus Psyllid and HLB.
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