Abstract Experiment No. 1 (table 1) was conducted on variety Lahonton in the Antelope Valley near Lancaster, Calif. This southern desert valley has an elevation of ca. 2400 ft and winter temperatures may go below 15-20° F in Dec and Jan. Only dormant alfalfa varieties are grown there. There is essentially one weevil generation per year which is present on the first cutting. When necessary, a single chemical application eliminates the weevil problem for the season. The sprays were applied to 15 × 50 ft plots in a randomized complete block design with 4 replicates for treated and untreated plots. The alfalfa was ca. 8-10 inch tall when the materials were applied on April 3 with a back-pack CO2 pressurized sprayer using 30 psi and ca. 10 gal finished spray per acre. Sixteen single 180° samples were taken per replicate with a standard sweep net, 15 inch diameter hoop, 26 inch handle. During the test period the mean H-L temperatures were 65-37°F. All materials and dosages gave very effective control of the Egyptian alfalfa weevil which was mainly composed of 2-4 instar larvae. Untreated plots suffered severe damage.