Residual effects of TMOF-Bti formulations against 1(st) instar Aedes aegypti Linnaeus larvae outside laboratory
Autor(es): Saiful A N,Lau M S,Sulaiman S,Hidayatulfathi O
Resumo: To evaluate the effectiveness and residual effects of trypsin modulating oostatic factor-Bacillus thuringiensis israeliensis (TMOF-Bti) formulations against Aedes aegypti (Ae. aegypti) (L.) larvae at UKM Campus Kuala Lumpur. Twenty first instar Ae. aegypti larvae were added in each bucket containing 4 L of water supplied with crushed dried leaf powder as their source of food. Combination of TMOF-Bti in rice husk formulation with the following weights viz 10, 25, 50 and 100 mg, respectively in duplicate was distributed in the buckets; while TMOF-Bti in wettable powder formulation each weighing viz 2, 5, 10 and 20 mg, respectively in duplicate was also placed in the buckets. The control buckets run in duplicate with 4 L of water and 20 first instar Ae. aegypti larvae. All buckets were covered with mosquito netting. Larval mortality was recorded after 24 hours and weekly for five weeks. A new batch of 20 1(st) instar larvae Ae. aegypti was introduced into each bucket weekly without additional TMOF-Bti rice husk formulation or wettable powder. The experiment was repeated for four times. The result of the study showed that all formulations were very effective on the first two weeks by giving 100% larval mortality for all concentrations applied. The TMOF (2%) + Bti (2%) had a good residual effect until the end of 3(rd) week, TMOF (4%) + Bti (4%) until 4(th) week, wettable powder TMOF (20%) + Bti (20%) until the third week. From the results it can be concluded that the TMOF-Bti formulations can be utilized in dengue vector control.
Palavras-Chave: 1st instar; Aedes aegypti; Dengue; Dengue vector control; Larvae; Larval mortality; Mosquito; Outside laboratory; Residual effect; TMOF-Bti formulations
Imprenta: Asian Pacific Journal of Tropical Biomedicine, v. 2, n. 4, p. 315-319, 2012
Identificador do objeto digital: 10.1016/S2221-1691(12)60031-8
Descritores: Aedes aegypti - Dengue ; Aedes aegypti - Public health
Data de publicação: 2012
