Abstract
Abstract Chemical treatments were applied on 2 Mar in a dryland field of “Arc” alfalfa on the South Central Research Station at Chickasha, OK. Controls for the alfalfa weevil, blue alfalfa aphid and pea aphid were evaluated. Chemicals were applied using a tractor drawn boom sprayer equipped with flooding nozzles and calibrated to deliver 20 gpa at 20 psi. Temperature at the time of application ranged from 60-70°F and winds were less than 5 mph. Plots were 4 x 7 m and arranged in a randomized complete block design with 4 replications. Population densities of weevil larvae were determined from 25 stem samples taken/plot on each posttreatment sampling date. Larvae were extracted from foliage with Berlese funnels and counts were calculated as larvae/stem. Pretreatment counts indicated an infestation level of 3.3 larvae/stem. Aphids were sampled by clipping 10 stems/plot on each date and washing aphids into a container of alcohol for counting. Initial aphid populations were less than i/stem.
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