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Effects of neem‐based insecticides on beet armyworm (Lepidoptera: Noctuidae)
Author(s) -
GREENBERG SHOIL M.,
SHOWLER ALLAN T.,
LIU TONGXIAN
Publication year - 2005
Publication title -
insect science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 45
eISSN - 1744-7917
pISSN - 1672-9609
DOI - 10.1111/j.1672-9609.2005.00003.x
Subject(s) - beet armyworm , biology , noctuidae , azadirachta , neem oil , lepidoptera genitalia , exigua , fall armyworm , agronomy , meliaceae , toxicology , horticulture , spodoptera , botany , biochemistry , gene , recombinant dna
Three commercial neem [ Azadirachta indica A. Juss (Meliaceae)]‐based insecticides, Agroneem, Ecozin, and Neemix, and a non‐commercial neem leaf powder, were evaluated for oviposition deterrence, antifeedant effect on larvae, and toxicity to eggs and larvae of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), on cotton leaves in the laboratory. Oviposition deterrence in no‐choice, and two‐ and fivechoice assays, was observed for the neem‐based insecticide treatments when compared with a non‐treated control. Neem‐based insecticides also deterred feeding by beet armyworm larvae. Direct contact with neem‐based insecticides decreased the survival of beet armyworm eggs. Survival of beet armyworm larvae fed for 7 days on leaves treated with neembased insecticides was reduced to 27, 33, 60, and 61% for neem leaf powder, Ecozin, Agroneem, and Neemix, respectively. Possibilities for adoption of neem‐based insecticides in commercial cotton for beet armyworm control are discussed.