Alfalfa Weevil Control in Alfalfa, 1991

Experimental plots measuring 7.3 × 7.3 m (24 × 24 ft) were established in a 5-yr-old field of ‘Oneida VR’ alfalfa in the early bud stage located in Ithaca, NY. Soils were silt loam. Eleven treatments and 2 untreated checks were replicated 4 times in a randomized complete block design. Treatments were applied on 21 May with a C02 pressurized ATV-mounted 8 nozzle spray boom which spanned 3.66 m (12 ft). The sprayer delivered 302.8 liters/ha (32 gal/acre) at 40 psi and an ATV speed of 5.6 km/h (3.5 mph). AW density was evaluated 1 day pre-treatment and 4 DAT by collecting 25 stems per plot and counting total number of larvae collected per plot. AW density was evaluated 7 and 14 DAT by collecting 10 stems per plot and counting total number of larvae collected per plot. Data for all plot samplings were expressed as mean AW/stem.