Presented at the International Congress of Plant Protection, Beijing, China, May 2004.
Biotypes B and Q of Bemisia tabaci and their relevance to neonicotinoid and pyriproxyfen resistance †
Article first published online: 8 MAR 2005
Copyright © 2005 Wiley-Liss, Inc.
Archives of Insect Biochemistry and Physiology
Special Issue: Novel Insecticides: Modes of Action and Resistance Mechanism
Volume 58, Issue 4, pages 216–225, April 2005
How to Cite
Horowitz, A. R., Kontsedalov, S., Khasdan, V. and Ishaaya, I. (2005), Biotypes B and Q of Bemisia tabaci and their relevance to neonicotinoid and pyriproxyfen resistance . Arch. Insect Biochem. Physiol., 58: 216–225. doi: 10.1002/arch.20044
- Issue published online: 8 MAR 2005
- Article first published online: 8 MAR 2005
- Chief Scientist of the Ministry of Agriculture, Israeli Cotton Board
- Sumitomo Co., Tokyo, Japan
- Agan Chemicals, Israel
- Bemisia tabaci;
- biotypes B and Q;
- resistance to insecticides;
- selection to insecticides
Resistance monitoring for Bemisia tabaci field populations to the juvenile hormone mimic, pyriproxyfen, was conducted from 1996 to 2003 in commercial cotton fields in two areas of Israel: the Ayalon Valley (central Israel) and the Carmel Coast (northwestern Israel). Although the use of pyriproxyfen ceased in these areas in 1996–1997 (because of the resistance), resistance levels to pyriproxyfen declined to some extent in the fields but remained quite stable, and the susceptibility has not been totally restored. Two strains of B. tabaci collected from the Ayalon Valley in the late 1999 and 2002 cotton seasons (AV99L, AV02L) were assayed for their susceptibility to pyriproxyfen at F1, and subsequently a line of each strain was kept under controlled conditions without exposure to insecticides. After maintenance of more than 20 generations under laboratory conditions, the resistance to pyriproxyfen in the untreated strains substantially declined. This decline was concurrent with a replacement of Q biotype by B-type under non-insecticidal regimes; apparently B biotype was more competitive than the pyriproxyfen-resistant Q-type. Selection under controlled conditions with neonicotinoids on these B. tabaci strains resulted in continued pyriproxyfen resistance, predominantly of Q biotype. Based on our data, applications of either pyriproxyfen or neonicotinoids may select for biotype Q, which would survive to a greater degree where these insecticides are applied. Arch. Insect Biochem. Physiol. 58:216–225, 2005. © 2005 Wiley-Liss, Inc.