Journal of Vector Ecology (2002) 27, 222-229

Theeraphap Chareonviriyaphap, Pornpimol Rongnoparut and Piyanoot Juntarumporn (2002)
Selection for pyrethroid resistance in a colony of Anopheles minimus species A, a malaria vector in Thailand
Journal of Vector Ecology 27 (2), 222-229
Abstract: This study tested susceptibilities of Anopheles minimus mosquitoes to deltamethrin during each of 19 generations (although technical problems excluded selective pressure experiments during generations 11-13). The ultimate goal was to establish a pyrethroid resistant colony of this important malaria vector in Thailand. Resistance was selected for by exposing, using the World Health Organization test protocol, sequential generations of An. minimus females to LD₅₀ and LT₅₀ values of deltamethrin. The LD₅₀ and LD₉₀ values were determined for populations from each subsequent generation by probit analysis and significant increases (chi-square test, P>0.01) occurred from one generation to the next. There was approximately a 22-fold increase in the LD₅₀ and a 27-fold increase in LD₉₀ when the F₁₀ generation was compared to the parent colony (F₁). Similarly, the LT₅₀ and LT₉₀ values were also increased during selection experiments during generations 14-19. There was roughly a 3-fold increase in susceptibility of F₁₉ females compared to F₁₄ females. In addition, deltamethrin conferred a cross-resistance to DDT in the selected colony. Baseline information from these experiments will serve as a guide for future studies on susceptibilities of wild An. minimus populations in Thailand.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Theeraphap Chareonviriyaphap

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

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Anopheles minimus		Thailand