Effects of Selected Dinitroaniline Herbicides on Uptake of Soil-Applied Insecticides by Cotton

M.F. Treacy, L.D. Barnes, R. Stoltz, and R.W. Whitmore


 
ABSTRACT

In 1986 and 1988, seven field trials were conducted in California and Texas to determine the impact of dinitroaniline herbicides, pendimethalin and trifluralin, on the ability of cotton seedlings to absorb systemic insecticides (Thimet 2OG and Counter 15G) from the soil. In six of the seven trials, cotton plants grown in pendimethalin-treated soil absorbed more insecticide than cotton plants grown in trifluralin-treated soil. When data were averaged for the seven trials, cotton grown in pendimethalin-treated soil accumulated 1.9-fold more insecticide than cotton grown in trifluralin-treated soil, during the first three weeks after emergence of plants. Although rootgrowth and insect-control parameters were not evaluated, results from this study suggest that: (1) increased insecticide content in cotton plants grown in pendimethalin-treated soil (vs. trifluralin-treated soil) may have been due to greater growth of cotton roots, and (2) efficacy of a soil insecticide against early season pests may be greater when cotton is grown in pendimethalin-treated soil vs. trifluralin-treated soil.



Reprinted from Proceedings: 1989 Beltwide Cotton Research Conferences pp. 381 - 383
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998