Journal of Insect Science (2008) 8 (4), 23-24

R. Horowitz, Svetlana Kontsedalov, V. Khasdan, H. Breslauer and I. Ishaaya (2008)
The biotypes B and Q of Bemisia tabaci in Israel - Distribution, resistance to insecticides and implications for pest management
Journal of Insect Science 8 (4), 23-24
in P. A. Stansly and C.L. McKenzie, organizers: Fourth International Bemisia Workshop - International Whitefly Genomics Workshop, December 3-8, 2006, Duck Key, Florida, USA
Abstract: Two biotypes of the whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), have been documented from Israel. Biotype B was recognized in the early 1990s and biotype Q was first evidenced in 2000. In order to determine the biotype status of B. tabaci in Israel, various whitefly populations collected during 2000-2006 from field and greenhouse sites were examined with DNA markers. The markers were developed through cleaved amplified polymorphic regions (CAPS) analysis, based on primers complementary to the mitochondrial cytochrome oxidase I (mtCOI) gene sequences. The whitefly collections were part of a nationwide program to monitor resistance to several important whitefly control agents such as, pyriproxyfen, acetamiprid and diafenthiuron. Based on the collected samples, both the B and Q biotypes are present throughout Israel, and field populations may consist of a mixture of the two biotypes. Their distribution probably depends on crop type, climate, and the intensity of treatments with pesticides. Restrictions to interbreeding between the two biotypes of B. tabaci were found, and it may resolve differences in biochemical and physiological characters and symbiont composition of these biotypes. A link between B. tabaci biotypes and insecticide resistance was found under field and laboratory conditions. In various locations the Q biotype has reached moderate to high resistance levels to pyriproxyfen (Resistance ratio= 25 - 600-fold). No resistance to pyriproxyfen was detected in the B biotype. Accordingly, B biotype predominates on organic farms, while numerous insecticide applications have selected for Q biotype elsewhere.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Abraham Rami Horowitz, Isaac Ishaaya

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1		Israel
	Bemisia tabaci biotype MED		Israel