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J Econ Entomol

Title:		Susceptibility of male oriental fruit moth (Lepidoptera: Tortricidae) populations from New Jersey apple orchards to azinphosmethyl
Author(s):		Usmani KA; Shearer PW;
Address:		"Rutgers Agricultural Research & Extension Center, Rutgers, the State University of New Jersey, Bridgeton 08302-5919, USA"
Journal Title:		J Econ Entomol
Year:		2001
Volume:		94
Issue:		1
Page Number:		233 - 239
DOI:		10.1603/0022-0493-94.1.233
ISSN/ISBN:		0022-0493 (Print) 0022-0493 (Linking)
Abstract:		"Toxicological responses to azinphosmethyl of male Oriental fruit moth, Grapholita molesta (Busck), from five commercial orchards in which control failures had occurred were examined for azinphosmethyl resistance and for potential resistance mechanisms by using topical pheromone trap bioassay and compared with a reference population that had no history of control failure and had received little selection pressure. The 1998 field survey indicated moderate level of resistance to azinphosmethyl (2.7-4.1-fold); slopes of regressions lines (2.47-2.76) indicate genetically heterogeneous populations. An approximate twofold decline was observed between the fourth flight of 1998 and the first flight of 1999, suggesting the presence of unstable resistance in moths collected from these study sites. The 1999 field surveys indicated lower levels of tolerance to azinphosmethyl. The resistance ratios ranged from 1.17 to 1.86 during the first flight of 1999 and 1.24-2.64 during the fourth flight of 1999. Steep slopes of the concentration-response lines during 1999 season indicated the presence of genetically homogeneous populations with some exceptions. A 1.5-2.0-fold increase was observed between the first and fourth flights of 1999, indicating that resistance can build up during the growing season. S,S,S,-tri-n-butyl phosphorotrithioate (DEF), but not piperonyl butoxide, significantly enhanced the toxicity of azinphosmethyl, suggesting that enhanced metabolism by esterases is involved in the tolerance of azinphosmethyl in moths collected from these study sties"
Keywords:		Animals *Azinphosmethyl Biological Assay *Insect Control/methods *Insecticides Male *Moths New Jersey Pheromones *Rosales;
Notes:		"MedlineUsmani, K A Shearer, P W eng England 2001/03/10 J Econ Entomol. 2001 Feb; 94(1):233-9. doi: 10.1603/0022-0493-94.1.233"