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LABORATORY AND FIELD EVALUATION OF NEOAPLECTANA CARPOCAPSAE (RHABDITIDA: STEINERNEMATIDAE) AGAINST THE ELM LEAF BEETLE (COLEOPTERA: CHRYSOMELIDAE) AND THE WESTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

Harry K. Kaya ,
Arnold H. Hara  and
Richard C. Reardon
Harry K. Kaya
Affiliation:
Davis, California 95616
Arnold H. Hara
Affiliation:
Davis, California 95616
Richard C. Reardon
Affiliation:
Davis, California 95616
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Abstract

Laboratory studies showed that elm leaf beetle, Pyrrhalta luteola (Müller), larvae and pupae were susceptible to the nematode Neoaplectana carpocapsae Weiser; adults were less likely to be infected because of their dispersal ability. Spruce budworm, Choristoneura occidentalis Freeman, larvae were susceptible to the nematode in the laboratory. Field application of the nematode in 2% aqueous Volck oil suspension against elm leaf beetle or spruce budworm larvae did not significantly reduce the populations when compared with controls. Desiccation of the infective nematodes may be a factor in the variable results for elm leaf beetle, and cool temperatures and rain may have been factors in the poor results for spruce budworm. However, significant population reduction occurred in nematode treatments against elm leaf beetle pupae in litter. This nematode may be used against beetle pupae in conjunction with other control tactics.

Résumé

Des études de laboratoire ont montré que les larves et les nymphes du galéruque de l’orme, Pyrrhalta luteola (Müller), sont susceptibles au nématode Neoaplectana carpocapsae Weiser; les adultes ont moins de chances d’être infectés à cause de leur capacité de dispersion. Au laboratoire, les larves de la tordeuse occidentale de l’épinette, Choristoneura occidentalis Freeman, sont susceptibles au nématode. Sur le terrain, des applications de nématodes dans une suspension à 2% d’huile Volck contre le galéruque ou les larves de la tordeuse n’ont pas réduit leurs populations de façon significative par rapport à celles de témoins. La dessication des nématodes appliqués a pu être un facteur de variabilité des résultats pour le galéruque de l’orme, et les basses températures combinées à la pluie sont possiblement responsables des piètres résultats avec la tordeuse. Cependant, une réduction significative de population a suivi les applications de nématodes faites dans la litière contre le galéruque de l’orme. Le nématode peut être utilisé contre les nymphes du galéruque en combinaison avec d’autres tactiques de lutte.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 9 , September 1981 , pp. 787 - 793
Copyright
Copyright © Entomological Society of Canada 1981

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