Simulated Insect Damage Effects on Yield, Maturity and Fiber Quality of Three Cotton Cultivars

Gary L. Lentz


 
ABSTRACT

Cotton lint yields on four harvest dates pooled across three cultivars were not significantly different among four square removal levels (0, 5, 10, 20%) in 1988 when squares were removed for six consecutive weeks. Total lint yields were not significantly different. Total lint yield from the 20% level was not significantly different from the 0% level for any of the three cultivars (Deltapine 90, McNair 220, and Stoneville 50S). On McNair 220, there were no significant lint yield differences among treatments on any of the four harvests. Significant lint yield differences were obtained on Stoneville 506 only on the fourth harvest date. Lint yields were significantly reduced in the 20% level on the second harvest date on Deltapine 90.

In 1989, cotton lint yields were significantly different on three of four harvest dates when pooled across three cultivars. Total lint from the 20% level in the pooled analysis was significantly lower than from the other levels of square removal. Total lint yield from the 20% level was not significantly different from the 0% level for any of the three cultivars. Significant differences among treatments were observed for Deltapine 90 and Stoneville 506 on the fourth harvest only. Lint yield from the 20% treatment was significantly reduced compared to the 0 and 5% level on the first harvest of McNair 220. Significant differences among treatments were found on the fourth harvest of McNair 220.

Within harvests, fiber quality was not affected by treatment (square removal) except where maturity was delayed. Significant fiber quality differences among harvest dates for all three cultivars were determined for micronaire, length, strength, elongation, reflectance, and yellowness.



Reprinted from 1990 Proceedings: Beltwide Cotton Production Research Conferences pg. 206
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998