Open AccessLethal and Sublethal Effects of Selected Insecticides and an Insect Growth Regulator on the Boll Weevil (Coleoptera: Curculionidae) EctoparasitoidCatolaccus grandis(Hymenoptera: Pteromalidae)
Author(s) -
G. W. Elzen,
S. N. Maldonado,
M. Guadalupe Rojas
Publication year - 2000
Publication title -
journal of economic entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 101
eISSN - 1938-291X
pISSN - 0022-0493
DOI - 10.1603/0022-0493-93.2.300
Subject(s) - biology , pteromalidae , curculionidae , insect growth regulator , hymenoptera , weevil , parasitoid , insect , boll weevil , larva , toxicology , biological pest control , botany , zoology
A laboratory culture of Catolaccus grandis (Burks), an ectoparasitoid of the boll weevil, Anthonomus grandis grandis Boheman, was exposed to lethal and sublethal doses of insecticides and an insect growth regulator using a spray chamber bioassay. Materials tested were azinphos-methyl, endosulfan, fipronil, malathion, cyfluthrin, dimethoate, spinosad, methyl parathion, acephate, oxamyl, and tebufenozide. At full rates, spinosad was significantly less toxic to female C. grandis than other treatments except endosulfan. Fipronil and malathion were significantly more toxic to females than other treatments. Most of the chemicals tested were highly toxic to male C. grandis; spinosad was least toxic. At reduced rates, most of 4 selected chemicals tested were low in toxicity to C. grandis; however, a reduced rate of malathion was significantly more toxic to females than other treatments. No C. grandis pupae developed from parasitism during a 24-h treatment period with malathion or spinosad. The sex ratio of progeny from sprayed adults appeared to be unaffected by the treatments.