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Susceptibility to insecticides and activities of glutathione S ‐transferase and esterase in populations of Lygus lineolaris (Hemiptera: Miridae) in Mississippi
Author(s) -
Fleming Daniel E,
Krishnan Natraj,
Catchot Angus L,
Musser Fred R
Publication year - 2016
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.4193
Subject(s) - lygus , miridae , esterase , tarnished plant bug , biology , hemiptera , pest analysis , toxicology , glutathione s transferase , botany , enzyme , glutathione , biochemistry
BACKGROUND Lygus lineolaris (Palisot de Beauvois) is a serious pest of cotton ( Gossypium hirsutum L.) in Mississippi, particularly in the Delta region. This may be due to decreased insecticide susceptibility in that region. Research has revealed populations of L. lineolaris in the Delta region with high levels of insecticide resistance; however, comparisons with populations in the remainder of the state are limited. RESULTS Experiments were undertaken to compare the LC 50 values and activities of detoxification enzymes of L. lineolaris populations. The results of these studies indicated that the LC 50 values were not different between the Delta and Hills regions, but differences were significant between populations within and across regions. Results of the detoxifying enzyme activity assays revealed significantly higher esterase activity in the Delta region when compared with the Hills. Glutathione S ‐transferase activity was not different between regions, but differences within and across regions were significant. CONCLUSION The results indicated that glass‐vial assays to determine and compare LC 50 values may be less accurate than enzymatic assays for detecting insecticide susceptibility differences. Higher esterase activity is likely a contributing factor to the difficulties with managing L. lineolaris in the Mississippi Delta region. © 2015 Society of Chemical Industry