Dicamba, picloram, 2,4-D tankmixes for control of leafy spurge

By： M. A. FERRELL

This research was conducted near Devil’s Tower, Wyoming to evaluate leafy spurge control with tankmixes of dicamba, picloram, and 2,4-D amine. Plots were 10 by 13.5 ft.
with four replications arranged in a randomized complete block. Spring treatments were applied broadcast with a CO2 pressurized six-nozzle knapsack sprayer delivering 40 gpa at 40 psi June 11, 1991 (air temp. 86º F, soil temp. 0 inch 95º F, 1 inch 85º F, 2 inch 80º F, 4 inch 80º F, relative humidity 30%, wind south at 5 mph, sky clear). Late summer treatments were applied September 11, 1991 (air temp. 70º F, soil temp. 0 inch 85º F, 1 inch 80º F, 2 inch 80º F, 4 inch 75º F, relative humidity 55%, wind west at 3 mph, sky 30% cloudy). The soil was classified as a silt loam (22% sand, 58% silt, and 20% clay) with 1.8% organic matter and a 6.3 pH. Leafy spurge was in the full bloom stage and 14 to 18 inches in height, for the spring treatments and past seed production and 14 to 20 inches in height, for the late summer treatments. Infestations were heavy throughout the experimental area. Visual evaluations were made September 25, 1992. Late summer applications of picloram+dicamba+2,4-D provided significantly better leafy spurge control than spring applications of picloram+dicamba+2,4-D. Herbicide combinations provide better control than individual herbicides at both dates. The addition of surfactant to combination treatments had no effect on leafy spurge control.


Yangzhou pioneer chemical CO.,LTD