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Fanners Should
Check Alfalfa
Stands Closely
Farmers who failed to get a heptachlor treatment on their alfalfa by March 9 now* will have to resort to methoxychlor or malathion to control the alfalfa weevil.
Dr J. O Rowell, entomologist at VPI, says farmers should check alfalfa stands closely and often. When most of the plant tops show some feeding injury, apply the first treatment of one of the insecticides. For most areas of Virginia, this stage will occur any time from earlv April to the first of May, but will vary considerably with location, elevation etc.
If the spray is applied too early the effectiveness of the residue will be lost before the larvae come in contact with it. The residue of methoxychlor is effective from 5 to 7 days; of malathion, from 3 to 5 days.
In most seasons, the spring-laid alfalfa weevil eggs continue to hatch over an extended period, and a single spray treatment is not enough to protect the alfalfa. Repeat spray treatments as often as necessary. Be sure to allow at least 7 days between the last treatment and harvest of the alfalfa for hay or use of the crop
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