Effect of Pellet Size of Defoliation and Estimated Kill of Small Stems Treated with Hexazinone

Abstract

Hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,2,5-triaine-2,4,(1H,2H)-dione] was tested in the 2, 1, and 0.5 cc size uellet (10% ai) against very small stems [average height, 1.97m; average ground line diameter (GLD), 2 cm] of water oak, Quercus nigra L., at 1.12 and 2.24 kg/ha on a sandy loam soil. First year defoliation of water oak by the 0.5 cc pellet at 2.24 kg/ha was significantly better than the 2 cc pellet at the same rate (88% and 59% respectively). Defoliation by the 0.5 cc pellet at 1.12 kg/ha (63%) was as good as defoliation from the 2 cc pellet at 2.24 kg/ha. On the basis of previous experiments, absolute kill of water oak in this study was calculated. The 0.5 cc pellet at 2.24 kg/ha will result in kill of 56% of the small stems in this study and the 2 cc pellet at this same rate will kill 32% of the stems. Reduction of the pellet size from 2 cc to 0.5 cc can result in product which is more effective and make its use feasible on some sites where it is not currently recommended.

Citation

Michael, J.L. 1981. Effect of Pellet Size of Defoliation and Estimated Kill of Small Stems Treated with Hexazinone. In: Proceedings, 34th Annual Meeting Southern Weed Science Society; 1981 January 20-22; Hot Springs Arkansas. [Champaign, IL]: Southern Weed Science Society. 192-196