Four Methods of Sampling to Measure Populations of Alfalfa Weevil Larvae13
- 1 June 1969
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Economic Entomology
- Vol. 62 (3) , 556-557
- https://doi.org/10.1093/jee/62.3.556
Abstract
When 4 methods of sampling to determine larval populations of Hypera postica (Gyllenhal) were compared, all of them produced essentially the same ranking of 8 treatments of azinphosmethyl. The sequential stem method of sampling (% of stems infested × number of larvae per infested stem × number of stems per ft2) recovered about 90% of the actual population and thus provided the most accurate estimate. Eight or 9 sweeps with a 15-inch net were required to produce the same estimate. D-Vac sampling recovered 19-25% of the actual population, and pan sampling recovered 29-38%.Keywords
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