Selective insecticide-induced stimulation on fecundity and biochemical changes in Tryporyza incertulas (Lepidoptera: Pyralidae).
The use of selective insecticides in rice, Oryza sativa L., fields often causes resurgence of nontarget pest insects. This study was conducted to investigate the effect of two selective insecticides, buprofezin and imidacloprid, on Tryporyza incertulas (Walker), a nontarget pest. After larval feeding on rice plants treated with each insecticide, fecundity, ovary protein content, and titer of juvenile hormone III (JHIII) in the resulting female moths were determined with 'Xiushui 63' rice susceptible to T. incertulas and 'Zhendao 2' moderately resistant to T. incertulas. The fecundity of females developed from larvae that fed on the insecticide-treated Xiushui 63 plants was stimulated compared with that of moths from larvae that fed on rice plants that were not treated with either insecticide. There was no stimulating effect in females from larvae that fed on insecticide-treated Zhendao 2 plants. The weight of fourth instars (final instars) that fed on the insecticide-treated Xiushui 63 rice plants was significantly greater than that of control, increasing by 50.3 and 46.7% for 60 and 112.5 g (AI) ha(-1) buprofezin, and by 23.7 and 19.5% for 15 and 37.5 g (AI) ha(-1) imidacloprid treatments, respectively. Ovary protein content in adult females developed from larvae that fed on the rice treated with the high dose of buprofezin was significantly higher than that in control. For the high and low doses of imidacloprid during the second instar, and the low dose of imidacloprid during the fourth instar, JHIII titers in female adults were also significantly higher than that in control, increasing by 152.81, 90.52, and 114.19%, respectively.
Wang
Ai-Hua
AH
Department of Plant Protection, Agricultural College, Yangzhou University, Yangzhou 225009, People's Republic of China.
Wu
Jin-Cai
JC
Yu
Yue-Shu
YS
Liu
Jing-Lan
JL
Yue
Jiang-Fei
JF
Wang
Mei-Yue
MY
D000818:Animals; D004305:Dose-Response Relationship, Drug; D005260:Female; D005298:Fertility / Q000187:drug effects; D007093:Imidazoles / Q000494:pharmacology; D019476:Insect Proteins / Q000378:metabolism; D007306:Insecticides / Q000494:pharmacology; D007814:Larva / Q000187:drug effects / Q000254:growth & development; D007915:Lepidoptera / Q000378:metabolism / Q000502:physiology*; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010053:Ovary / Q000187:drug effects / Q000378:metabolism; D010058:Oviposition / Q000187:drug effects; D012717:Sesquiterpenes / Q000378:metabolism; D013829:Thiadiazines / Q000494:pharmacology
D007093:Imidazoles; D019476:Insect Proteins; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D012717:Sesquiterpenes; D013829:Thiadiazines; C083997:buprofezin; C082359:imidacloprid; C036585:juvenile hormone III