Susceptibility of Arizona whiteflies to chloronicotinyl insecticides and IGRS: New developments in the 1999 season

Y. Li, T. J. Dennehy, X. Li, M. E. Wigert

Research output: Contribution to conferencePaper

9 Scopus citations

Abstract

Whiteflies are serious pests of cotton, melons, and winter vegetables in Arizona's low deserts. Successful management of whiteflies requires an integrated approach, a critical element of which is routine pest monitoring. In this paper we report findings of our 1999 investigations of resistance of Arizona whiteflies to insect growth regulators (IGRs) and chloronicotinyl insecticides. Whiteflies collected from cotton fields, melon fields and greenhouses were tested for susceptibility to imidacloprid (Admire®/Provado®), and two other chloronicotinyl insecticides, acetamiprid and thiamethoxam, and to two insect growth regulators (IGRs), buprofezin (Applaud®) and pyriproxyfen (Knack®). Contrasts of 1998 and 1999 results indicated increased susceptibilities, on average, to both imidacloprid and buprofezin of whiteflies collected from cotton. A cropping system study showed that whiteflies collected from spring melons had significantly lower susceptibility to imidacloprid than those collected from cotton or fall melons. The opposite was found for pyriproxyfen, to which whiteflies from cotton and fall melons had lower susceptibility than those from spring melons. As in 1998, whiteflies with reduced susceptibility to imidacloprid continue to be found in certain locations, particularly in spring melon fields and greenhouses. Results of our laboratory bioassays on susceptibility of Arizona whiteflies to chloronicotinyl insecticides provided evidence of a low order cross-resistance between imidacloprid, acetamiprid and thiamethoxam. Monitoring in 1999 provided the first evidence of reduced susceptibility of Arizona whiteflies to pyriproxyfen.

Original languageEnglish (US)
Pages1325-1330
Number of pages6
StatePublished - Jan 1 2000
Event2000 Beltwide Cotton Conferences Volume 2 - Texas, United States
Duration: Jan 4 2000Jan 8 2000

Other

Other2000 Beltwide Cotton Conferences Volume 2
CountryUnited States
CityTexas
Period1/4/001/8/00

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)
  • Materials Science(all)

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    Li, Y., Dennehy, T. J., Li, X., & Wigert, M. E. (2000). Susceptibility of Arizona whiteflies to chloronicotinyl insecticides and IGRS: New developments in the 1999 season. 1325-1330. Paper presented at 2000 Beltwide Cotton Conferences Volume 2, Texas, United States.