Title:	Toxicity and synergism of insecticides against susceptible and pyrethroid-resistant third instars of the tobacco budworm (Lepidoptera: Noctuidae).
Authors:	CAMPAGNOLLA, C. PLAPP JUNIOR, F. W.
Affiliation:	CLAYTON CAMPAGNOLLA, SGE; F. W. PLAPP JUNIOR, Texas A&M University.
Date Issued:	1989
Citation:	Journal of Economic Entomology, v. 82, n. 6, p. 1495-1501, dez. 1989.
Description:	Third-instar tobacco budworms, Heliothis, susceptible or resistant to pyrethroids were tested by exposure to residues of insecticides in glass liquid scintilillation vials. These biossays were done to find alternative insecticides or insecticide combinations for control of larvae resistant to pyrethroids, to evaluate the effect of synergists on insecticide toxicity and resistance, and to establish the main mechanisms of resistance present. Insecticides effective for control of resistant third-instar tobacco budworms included profenofos, sulprofos, acephate, endusulfan, methomyl, and thiodicarb. Cypermethrin combined with chlordimeform, piperonyl butoxide nor chlordimeform produced more thenfive-fold synergism. The only synergistic insecticide combination against resistant larvae was cypermethrin plus methyl parathion. Thus, use of other combinations had no advantage compared with use of alternative insecticides. High-level cypermethrin resistance, resistance to methyl parathion, and synergism of these insecticides by piperonyl butoxide provide evidence for metabolic resistance in this life stage. Therefore, we conclude that metabolic resistance seems to be the most important mechanism in large tobacco budworms.
Thesagro:	Heliothis Virescens
NAL Thesaurus:	Lepidoptera Noctuidae chemical control synergism toxicity
Keywords:	Bugs Insecticide Pyrethroid Resistence Susceptibility Insect Pest Tobacco budworms
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPMA)