Effects of Timing of Application of Different Defoliants on the New Cotton Variety Laguna 89

A. S. Godoy, A.L.E. Moreno, C.E.A. Garcia


Laguna 89, a new cotton variety for the Northern of Mexico, has been released to be part of a high productivity system. However, Laguna 89 is a cultivar earlier than Delta types, then some modifications to the practices normally used in the actual production systems are needed. The objective of this research was to determine the defoliation date as well as the best product to defoliate Laguna 89.

The field experiment was conducted in 1992 at the Experimental Station at La Laguna, Mexico. The experimental design was a split plot with four replications. Main plots were defoliation dates at 129, 134, and 136 days after planting. Defoliants were the sub plots: Untreated check, Defolia, Dropp, and Dropp + Karmex. Number and dry matter of leaves remaining in the plant after 10 and 20 days of defoliant application were used as variables to measure the main effects of defoliation.

There were not significant differences when Laguna 89 was defoliated at any of the application dates. Defoliants caused a significant loss of 80 percent of the leaves and the 85 percent of dry matter of leaves. This indicated that any of these products can be used with the same efficiency to defoliate Laguna 89.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pp. 1366 - 1367
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998