Pest Management Science (2013) 69, 535-541

Siddharth Tiwari, Nabil Killiny, Rajinder S. Mann, Erik J. Wenninger and Lukasz L. Stelinski (2013)
Abdominal color of the Asian citrus psyllid, Diaphorina citri, is associated with susceptibility to various insecticides
Pest Management Science 69 (4), 535-541
Abstract:
Background
Color morphs of an insect species are known to vary in activities of detoxifying enzymes and associated susceptibility to insecticides. In Diaphorina citri, three color morphs are known to occur. In the present study, susceptibility to four insecticides was compared among gray/brown, blue/green and orange/yellow color morphs of field-collected D. citri.
Results
The orange/yellow morph was significantly more susceptible to fenpropathrin than the blue/green morph, and imidacloprid and chlorpyrifos caused higher mortality in the orange/yellow morph than in the blue/green and gray/brown morphs. To confirm the genetic basis of variable levels of susceptibility, the relative expression of five CYP4 genes was compared among the color morphs. CYP4C67 was expressed at significantly higher levels in the blue/green than in the orange/yellow and gray/brown morphs. CYP4DA1, CYP4C68, CYP4G70 and CYP4DB1 were expressed at significantly higher levels in the blue/green and gray/brown morphs than in the orange/yellow morph. Lower expression of CYP4 genes in the orange/yellow morph as compared with the others was correlated with reduced signal of 45 kD cytochrome P450 proteins, as determined by the western blot.
Conclusions
The results indicate differential susceptibility of D. citri color morphs to insecticides, which will need to be accounted for in future insecticide monitoring programs and may affect management programs.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Lukasz Stelinski, Erik J. Wenninger, Nabil Killiny, Rajinder Singh Mann

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diaphorina citri