Aspects of the field and developmental biology of a Apanteles yakutatensis, a parasitoid of Autographa californica Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1831cp49h

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  • Behavioral and ecological aspects of the field and developmental biology of Apanteles yakutatensis (Ashm.), a primary larval parasite of the alfalfa looper, Autographa californica (Speyer), were investigated in 1980 and 1981. Populations of A. yakutatensis were found in commercial peppermint, alfalfa and crimson clover fields involving two areas (Willamette Valley, Great Basin) with very different climatic regimes. Second instar host larvae appeared to be the most commonly attacked stage in the field. There was no relationship between the numbers of host larvae collected in any one sample and the proportion of hosts parasitized in that sample. Thus, in peppermint fields, A. yakutatensis did not appear to respond in a dependent manner to changes in host density. Requirements for larval development and adult longevity were investigated in the laboratory. When fed a thirty percent honey water solution, A. yakutatensis females lived an average of 18 days and males lived an average 16.5 days. When provided with water only, males and females lived an average of 2.5 days. The larvae of A. yakutatensis required 162 degree days above 10.5°C to complete development, and pupae required 85 degree days above 9.4°C. Larvae of A. yakutatensis required 10.5 days to complete development at 26°C and passed through three instars. The first instar was mandibulate, and the other two were hymenopteriform. The age of host attacked had no significant effect on the time required for development of A. yakutatensis at 26°C, but did affect the time required for the host to reach the prepupal stage. The number of A. yakutatensis larvae per host did not affect the percentage of larvae successfully emerging from individual hosts, but there was a negative relationship between the number of larvae per host and the mean weight of adults produced by individual hosts.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-27T15:14:57Z (GMT) No. of bitstreams: 1 MadarRobertJohn1983.pdf: 447599 bytes, checksum: 3135dbae93f1c44db6ccf8083945dee8 (MD5)
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