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ARS Home » Research » Publications at this Location » Publication #93373
Title: IMPACT OF NATUTRAL ENEMIES AND INSECTICIDES ON WHITEFLIES IN COTTON: A PARTIAL LIFE TABLE ANALYSIS

Author
item ELLSWORTH, PETER - UNIV OF AZ, MARICOPA, AZ
item DIEHL, JONATHON - UNIV OF AZ, MARICOPA, AZ
item Naranjo, Steven

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 6/1/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The number of sprays required to control whiteflies (Bemisia tabaci [strain B] = B. argentifolii Bellows &Perring) in Arizona has dramatically declined in the last two years. In 1995, Arizona averaged 6.6 sprays against whiteflies, but this declined to 1.99 and 1.81 sprays in 1996 and 1997, respectively (Williams, 1996, 1997, 1998). This dramatic reduction was coincident with the introduction of the insect growth regulators (IGRs), Knack (pyriproxyfen) and Applaud (buprofezin), to Arizona through Section 18 exemptions. Data from an integrated whitefly management trial conducted on a commercial-scale in 1996 showed a prolonged period of suppression of whiteflies after the initial use of an IGR, up to 8 weeks below threshold (Ellsworth et al. 1997). In 1997, we continued our examination of whitefly management strategies under quasi-commercial conditions. The period of suppression lasted only 4-6 weeks in this year. In either case, the period dof suppression exceeded the putative period of IGR residual activity.