A new aqueous suspension concentrate formulation of cis-permethrin and its insecticidal activity
✍ Scribed by Hector Masuh; Emilia Seccacini; Susana A de Licastro; Eduardo Zerba
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 105 KB
- Volume
- 56
- Category
- Article
- ISSN
- 1526-498X
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✦ Synopsis
Isomers of pyrethroids usually have different insecticidal activities. Permethrin, a noncyano pyrethroid, is not an exception and cis-permethrin is much more active than the trans-isomer against Triatoma infestans, vector of Chagas' Disease in Argentina. The large-scale separation of cisand trans-permethrin was performed by successive recrystallizations from ethanol-water mixtures. An aqueous suspension concentrate (¯owable) formulation of pure crystalline cis-permethrin was prepared and assayed for its insecticidal activity on wood and ceramic surfaces against nymph V of T infestans. This formulation was at least three times more effective than deltamethrin, with LC 50 values on ceramic of 0.11 mg cm À2 and 0.33 mg cm À2 respectively. On wood surfaces, the LC 50 value was 0.57 mg cm À2 compared with 3.20 mgcm À2 for deltamethrin. Against other insect species such as Periplaneta americana, Aedes aegypti and Culex quinquefasciatus, the suspension concentrate formulation of cispermethrin was, however, less effective than similar formulations of deltamethrin or b-cypermethrin.