About
  PDF
Full Text
(281 K)

Thrips Management in Arkansas Cotton

John D. Hopkins, Jack D. Reaper, III, D.R. Johnson and G.M. Lorenz, III


ABSTRACT

Thrips is an early-season cotton pest that has the potential to cause delayed maturity and yield loss in Arkansas cotton, with the level of damage varying from year to year based on the severity of the thrips infestation. As the severity of thrips infestation cannot be predicted, cotton producers rely on in-furrow insecticides and insecticidal seed treatments as a prophylactic measure to reduce the risk of thrips damage. The objective of this experiment was to evaluate in-furrow (IFAP), seed treatment (ST), and combination ST + foliar insecticides (FS) for thrips management in cotton. Experiments were conducted in Mississippi Co. and Lee Co., AR, in 2001. The tobacco thrips was the predominant thrips species infesting both trials. Thrips counts and thrips damage ratings were taken beginning approximately 2 weeks after planting (WAP) and continued through mid-June. Stand was evaluated approximately one month after planting and yields were determined after harvest. Thrips numbers were low at both locations. In the Mississippi Co. location all treatments at all ratings reduced thrips numbers below that of the untreated check. Treatments numerically reduced the thrips count at the Lee Co. location through 22 days after planting (DAP). All chemical treatments significantly reduced thrips damage at the Mississippi Co. location, with the Temik treatments having the least damage at 33 DAP. At the Lee Co. location all chemical treatments reduced thrips damage with the reduction being significant (P=0.05) at the 36 DAP rating. Little difference was observed among chemical treatments for thrips damage at both locations. No chemical treatment at either location caused a statistically significant stand reduction or yield increase. However, on a numerical basis, Adage 5FS (300 gm/100Kg), Gaucho 480FS (8oz/cwt), L0263-A1 (250 floz/cwt), and Gaucho 480FS (8oz/cwt) + Orthene 97 (0.2 lbai/A) were the highest yielding treatments in both locations. The data presented from these trials indicate that the Adage and Gaucho seed treatments offer a level of thrips protection equal to Temik under light to moderate thrips pressure.





[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page

Document last modified May 20, 2002