Abstract
The failure of parathion to give persisting control of the spotted alfalfa aphid, Therioaphis maculata (Buck.), in southern California despite satisfactory initial kill is believed due to the destruction of natural enemies. Late larval and pupal stages of internal parasites of T. maculata are not all killed by relatively high dosages of the most toxic aphicides tested, but those materials having the most persistent residues destroy the adults upon emergence. Comparison of the toxicities of 13 aphicides to T. maculata adults and to Hippodamia adults and larvae show that at the LD-95 for the spotted alfalfa aphid, conservation of coccinellids is highest with nicotine sulphate, and decreases in degree with schradan, demeton, Trithion, Phosdrin, pyrethrurn extract, TEPP, lindane, BHC. toxaphene, parathion, malathion. and rotenone. Demeton, because of its high aphid toxicity and favorable effect on coccinellids and parasites, is suggested as the most practical material for integrated chemincal and biological control of T. maculata.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
