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ARS Home » Research » Publications at this Location » Publication #81180
Title: SAMPLING SWEETPOTATO WHITEFLY NYMPHS IN COTTON

Author
item ELLSWORTH, PETER - UNIV. OF AZ. MAC
item DIEHL, JONATHAN - UNIVERSITY OF AZ. MAC
item Naranjo, Steven

Submitted to: Extension Circular
Publication Type: Other
Publication Acceptance Date: 5/1/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: We developed and extended a sampling protocol for timing the application of insect growth regulators for control of the sweetpotato whitefly. These plans require counting the number of large, visible nymphs within a 4 square centimeter leaf disk and the number of adult whiteflies on the fifth mainstem node leaf down from the terminal. Use of insect growth regulators for whitefly control is recommended when whitefly densities from 30 plants average 0.5-1.0 large nymphs per disk and 3-5 adults per leaf. Additional options are provided if only nymphs or adults exceed these respective densities. About 6000 copies of this extension circular have been distributed to growers, pest control advisors and extension agents in Arizona. The sampling protocol was tested in a large-scale demonstration experiment in Maricopa, AZ and found to be an accurate method for timing the application of insect growth regulators.