Potentiation of some insecticides by sesamol on cotton leafworm, Spodoptera littoralis | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 9, Issue 3, December 2009, Pages 51-62 PDF (571.9 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2009.459627 | ||
| Authors | ||
| S. M. Abdel Rahman* ; S. A. Abo-Seda | ||
| Central Pesticide Laboratory, Sabhia Station, Alexandria. | ||
| Abstract | ||
| The effectiveness of sesamol as a natural product and certain insecticides, three organophosphates (fenitrothion, chlorpyrifos-methyl, dimethoate), two carbamates (menthion, thiodicarb) and one pyrethroid (delamethrin) as well as the joint action of their mixtures were investigated against the fourth-instar larvae of the laboratory strain of cotton leafworm, Spodoptera littoralis (Boisd). The results showed that delamethrin was the most toxic insecticide followed by methylol, thiodicarb, chlorpyrifos-methyl and fenitrothion, while dimethoate was the least toxic one. The results also indicated that sesamol even at the highest concentration (10,000 ppm) did not show any insecticidal activity. The joint action between these insecticides at the LC₅₀ levels and sesamol at 1000 ppm indicated that delamethamol, methylol or thiodicarb and sesamol mixtures produced high level of synergism, while the mixtures of sesamol and dimethoate or fenitrothion had moderate degree of synergism. However, chlorpyrifos-methyl had an additive effect. The results also revealed that increasing sesamol concentration increased the synergistic activity. It might be concluded that the application rates of pyrethroid and carbamate insecticides could be reduced when combined with sesamol to the control of cotton leafworm. | ||
|
Statistics Article View: 1 |
||
