Mechanisms of Resistance to Organophosphorus and Pyrethroid Insecticides in Asian Citrus Psyllid, Diaphorina Citri Populations in Florida by Lambert HB Kanga* in Current Investigations in Agriculture and Current Research (CIACR) in Lupine Publishers
Background: The Asian citrus psyllid (ACP) is the most
devastating pest on citrus in Florida as it vectors causal pathogens of
citrus greening a disease also known as huanglongbing. Florida is the
largest citrus producer in the.com and the development of insecticide
resistance in ACP populations is a serious threat to the citrus
industry. Mechanisms of resistance in ACP are not fully understood.
Thus, in order to develop a resistance management program, the primary
type of resistance must be determined. We conducted several studies to
investigate the mechanisms of resistance to two commonly used classes of
insecticides in ACP populations.
Results: Enhanced metabolism by esterase (185.0-fold) and
carboxyl esterase (30.33-fold) were major factors of resistance to
organophosphorus insecticides. In addition, glutathione-s-transferees
(2.5-44 fold), mixed function oxidise (2.17-fold), and altered target
site (3.67-fold) were also significant factor of resistance to
pyrethroid insecticides.
Conclusion: Mechanisms of resistance in ACP populations to
insecticides were both metabolic and altered target site; therefore
synergist probes such as piperonyl butoxide, S, S, S, -tri-n- butyl
phosphorotrithionate, triphenyl phosphate and formamidine could be used
successfully to design a resistance management strategy for the Asian
citrus psyllid.
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