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Regrowth Patterns of the Perennial Weeds Treated with Sulfonylureas and Starch Degradation in the Rhizome  

Hwang, I.T. (Korea Research Institute of Chemical Technology)
Lee, K.H. (Korea Research Institute of Chemical Technology)
Hong, K.S. (Korea Research Institute of Chemical Technology)
Kim, J.S. (Korea Research Institute of Chemical Technology)
Lee, B.H. (Korea Research Institute of Chemical Technology)
Cho, K.Y. (Korea Research Institute of Chemical Technology)
Publication Information
The Korean Journal of Pesticide Science / v.6, no.1, 2002 , pp. 36-41 More about this Journal
Abstract
Characteristics of regrowth and starch degradation in perennial weed rhizomes were investigated in a greenhouse. Cyperus serotinus started regrowth at 24 days after treatment of 1.25 g ai/ha of pyrazosulfuron-ethyl. The regrowth of Sagittaria trifolia, Eleocharis kuroguwai, and S. pygmaea required $30{\sim}39$ days, and Potamogeton distinctus regrew at 55 days after treatment of 1.25 g ai/ha of pyrazosulfuron-ethyl. However, all of 5 perennial weeds hardly regrew until 45 days after treatment more than 5 g ai/ha of pyrazosulfuron-ethyl. Regrowth of C. serotinus 4-node rhizomes was 2 times higher than 2-node rhizomes, and $1{\sim}1.5g$ of E. kuroguwai large tubers regrew faster than $0.3{\sim}0.5g$ of small tubers treated with bensulfuron-methyl. Regrowth of C. serotinus was enhanced with delayed application of bensulfuron-methyl, however, 2-leaf stage of E. kuroguwai plants regrew better than 3 leaf stage of plants when treated with equal volume of bensulfuron-methyl. The critical periods of S. trifolia and E. kuroguwai growth depending upon the rhizome detachment were 12 and 18 days after sprouting, respectively. The starch stacked in the S. trifolia and E. kuroguwai tubers were exhausted at 18 and 27 days after sprouting, respectively. The highest level of sugar contents was showed at 9 days after sprouting in S. trifolia, and 18 days after sprouting in E. kuroguwai.
Keywords
Application time; critical period; perennial weeds; rhizome size; regrowth; starch; sugar; sulfonylureas;
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