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dc.contributor.authorTownsend, P.
dc.date.accessioned2011-11-22T21:36:46Z
dc.date.available2011-11-22T21:36:46Z
dc.date.issued1980
dc.identifier.urihttps://hdl.handle.net/10182/4043
dc.description.abstractThe insecticides pirimicarb, fenvalerate, chlorpyrifos and demeton-S-methyl were tested against lucerne aphids Acyrthosiphon kondoiShinji and A. pisum (Harris) and against the natural enemies Austromicromus tasmaniae (Walker) and Coccinella undecimpunctata L. by topical application. LD₅₀ values were determined. Pirimicarb was 1000 – 10000 times more toxic to the aphids than to the predators while the equivalent factors for fenvalerate and demeton-S-methyl were 5 – 1000 and 4 – 100 respectively. Chlorpyrifos showed the same order of toxicity to both predators and aphids. The effect of post-treatment temperatures of 10 and 25°c on the toxicity of pirimicarb, fenvalerate and chlorpyrifos to the adult lacewing A. tasmaniae was investigated. A marked increase in toxicity of fenvalerate was observed at 10°c. A brief investigation of possible sublethal effects of fenvalerate on lacewing fecundity, and of pirimicarb and fenvalerate on the length of the larval developmental stage, revealed no significant effects.en
dc.language.isoenen
dc.publisherUniversity of Canterburyen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rightsen
dc.subjecttoxicityen
dc.subjectalfalfaen
dc.subjectdisease controlen
dc.subjectpest controlen
dc.subjectaphidsen
dc.subjectinsecticidesen
dc.subjectinsectsen
dc.subjectlucerneen
dc.subjectMedicago sativa L.en
dc.subjectchemical controlen
dc.subjectinsect toxicologyen
dc.subjectNew Zealanden
dc.subjectpirimicarben
dc.subjectfenvalerateen
dc.subjectchlorpyrifosen
dc.subjectdemeton-S-methylen
dc.subjectAustromicromus tasmaniae (Walker)en
dc.subjectCoccinella undecimpunctata L.en
dc.subjectAcyrthosiphon kondoi Shinjien
dc.subjectAcyrthosiphon pisumen
dc.titleToxicity studies of insecticides on lucerne aphids and their predatorsen
dc.typeThesisen
thesis.degree.levelMasters
thesis.degree.nameMaster of Agricultural Scienceen
lu.thesis.supervisorPenman, D. R.
lu.thesis.supervisorChapman, R. B.
lu.contributor.unitDepartment of Ecologyen
dc.rights.accessRightsDigital thesis can be viewed by current staff and students of Lincoln University only. Print copy available for reading in Lincoln University Library. May be available through inter-library loan.en
dc.subject.anzsrc070308 Crop and Pasture Protection (Pests, Diseases and Weeds)en
dc.subject.anzsrc060808 Invertebrate Biologyen
dc.subject.anzsrc111506 Toxicology (Incl. Clinical Toxicology)en
dc.subject.anzsrc079902 Fertilisers and Agrochemicals (Incl. Application)en


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