Journal of Economic Entomology (1999) 92, 40-46

Nilima Prabhaker, Nick C. Toscano and Thomas J. Henneberry (1999)
Comparison of neem, urea, and amitraz as oviposition suppressants and larvicides against Bemisia argentifolii (Homoptera : Aleyrodidae)
Journal of Economic Entomology 92 (1), 40-46
Abstract: The activities of 2 formulations of neem seed extract, a crude extract from India, and Azatin, a neem-based insecticide, in addition to urea and a mixture of neem seed extract + urea, were investigated as oviposition suppressants and larvicides against Bemisia argentifolii Bellows et al 1994. Both seed and soil applications to cotton were tested. Oviposition was not significantly suppressed by pretreatment of cotton seeds by neem seed extract but was when it was applied as a soil treatment. However, both seed and soil applications of neem seed extract produced significant mortality of immatures leading to reduced emergence of adults. Azatin was effective in suppression of oviposition as well as in inducing larval mortality by both methods of application. Treatment of cotton seeds by urea was effective in reducing oviposition but failed to do so in a soil application. Treatment of seeds or soil by urea was not toxic to immatures. However, a mixture of neem seed extract + urea suppressed oviposition and killed larvae, thus reducing the numbers of adult whiteflies that emerged. Foliar applications of neem seed extract and Amitraz, a nonchlorinated formamadine, were investigated in another series of tests of their effects on oviposition and development of whitefly immatures. Both compounds effectively suppressed oviposition and induced mortality of immatures. Ovicidal activity of Amitraz appeared to occur late in embryonic development, or even postembryonically during eclosion. These results suggest that the use of neem or Amitraz as alternative chemicals in a resistance management program for whiteflies deserves consideration.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Nilima Prabhaker

Research topic(s) for pests/diseases/weeds:
control - general

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bemisia tabaci biotype MEAM1	Cotton (Gossypium)