Economic Injury Levels of the Egyptian Alfalfa Weevil or the Alfalfa Weevil or the Alfalfa Weevil12

descriptionPublicationkeyboard_double_arrow_right Article 01 Feb 1975 English Publisher:Oxford University Press (OUP)Journal:Journal of Economic Entomology, volume 68, pages 71-75 (issn: 0022-0493, eissn: 1938-291X,

Authors: Sara S. Rosenthal; C. S. Koehler;

doi: 10.1093/jee/68.1.71

Economic Injury Levels of the Egyptian Alfalfa Weevil or the Alfalfa Weevil or the Alfalfa Weevil12

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Abstract

Pre-season applications of heptachlor to alfalfa were used to establish gradients of Egyptian alfalfa weevil, Hypera brunneipennis Boheman, or alfalfa weevil, H. postica (Gyllenhal), larval levels. Correlations of larval numbers and 1st cutting hay yields disclosed that every increase of 1 larva/sweep at the larval peak was associated with a yield reduction of 9.1 lb of hay. Economic injury levels calculated indicate when artificial control measures are not economically justified.

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University of California, Berkeley
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