Abstract
Thimet and Bayer 19639 were tested to determine their effects on Pima S-1 and Acala 1517C cotton. Both materials reduced seedling stands of Pima S-1 while the Thimet retarded blossoming and reduced growth during the early part of the season. The Acala 1517C reacted in a somewhat different manner to the treatments but neither variety showed a decrease nor increase in yield of cotton at the end of the season.