Abstract
Benomyl and carbofuran were used to minimize alfalfa defoliation by foliar disease, mainly common leafspot caused by Pseudopeziza medicaginis (Lib.) Sacc., and by larval feeding of Hypera brunneipennis (Boheman). First cutting forage yield was increased 11% with weevil control. 18% with disease suppression, and 26% when both pests were suppressed or controlled. Premature leaf abscission was markedly reduced in plots where disease was suppressed, resulting in a significant increase in leaf biomass, Benomyl had no adverse effect on the larvae, and populations in these plots were not significantly different from those in the untreated check. There was no difference in percent protein or percent modified crude fiber among any of the treatments. Defoliation by larval feeding and foliar disease was confined to the 1st crop. Second cutting yields were not significantly different, indicating that neither common leaf spot infection nor weevil feeding prior to the 1st cutting caused stunting or loss of vigor to the 2nd crop.
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