Trail Chemicals of the Convergens Ladybird Beetle, Hippodamia convergens, Reduce Feeding and Oviposition by Diaphorina citri (Hemiptera: Psyllidae) on Citrus Plants
We investigated feeding and oviposition behavior of the Asian citrus psyllid, Diaphorina citri, when exposed to the foraging trails of the convergens ladybird beetle, Hippodamia convergens. Diaphorina citri females feeding on citrus leaves directly exposed to the ladybird adults or treated with trail extract excreted significantly less honeydew droplets than controls. The trail chemicals of the ladybird beetle also decreased oviposition by D. citri females on citrus. In a no-choice experiment, D. citri females preferred to oviposit on control flush and plants than those with ladybird trail-extract treatments. In two-choice experiments, 68.0% of D. citri released into cages exhibited strong selection preference for settling and eventual oviposition on control plants than plants treated with ladybird trail extract. Diaphorina citri eggs were found on all new leaf flush of control plants, whereas only 29.5% of flush on treatment plants were selected for oviposition. The trail chemical deposited by the convergens ladybird beetle elicits repellency of D. citri feeding and oviposition. Therefore, the trail chemicals my contain components that could be useful for behavior-based management of D. citri and HLB disease by reducing psyllid feeding and oviposition.
KeywordsHippodamia convergens Coccinellidae huanglongbing (HLB) feeding inhibition oviposition inhibition Diaphorini citri
We thank Wendy L. Meyer, Angelique B. Hoyte, Kristin A. Racine, and Hunter Gossett for technical support. We really appreciate Timothy A. Ebert for giving the pea aphid for rearing ladybird beetles. This project was supported by the Citrus Research and Development Foundation grant number 15-024.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
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