Value of Furadan and Pydrin for Sunflower Beetle and Stem Weevil Control, 1985

A set of plots were established at 8 different locations representative of present and recent past sunflower production in MN. Individual plots were 4 rows × 35 ft in 30 inch rows. The same 11 treatments and 4 replicates were used at each location and arranged in a randomized complete block design with different randomization at each location. Soil types varied from clay at Crookston to sandy loam at Oklee. Furadan 4F and 15G were applied in a 4 inch band on the row at, or as soon after, planting as possible and incorporated. Foliar applications of Furadan 4F and Pydrin 2.4E were broadcast at the appropriate plant stage. Foliar applications were made with a hand held CO2 sprayer using about 20 gal of total material per acre applied at 40 lb psi. Defoliation readings and stem infestations were collected during the growing season. Heads were taken by hand on the center two rows, dried, threshed and yields of clean seed recorded. Yields were analyzed by location and together and are so reported.