21 Kas 2024 Perşembe
Comparative efficacy of synthetic and botanical pesticides against Tetranychus urticae (Koch) (Acarina: Tetranychidae)
Abstract :A comparison was made for studying the effect of pesticides viz. Omite 57 EC, Kumulus DF, and botanical oils like neem oil, mahogony oil, chilli extract and water on the mite pest, Tetranychus urticae (Acarina: Tetranychidae). The sublethal concentrations of Omite 57 EC (20 ml/10L), Kumulus DF (4.5 gm/L), neem oil (5 ml/L), mahogony oil (5 ml/L) and chilli extract (10 gm/L) were used. The test was conducted in both the semi-field (25-34°C, 65 - 80% RH and a photoperiod of 13L: 11D) and laboratory (26 - 32°C, 70 - 85% RH and a photoperiod of 12 - 13: 12 - 11 L: D) conditions using bean variety IPSA 2 with three replications. The direct toxicity assays in the field showed that the highest mortality caused by Omite 57 EC (96.37%, 100%, 99.62%, 100% and 100%), while the lowest mortality was in water (23.22%, 2.13%, 0.01%, 3.71% and 0.00%) after 1st, 3rd, 7th, 14th and 21st days of spraying. In the laboratory, similar trend of mortality was observed maximum in Omite 57 EC (100%), while the lowest was found in case of untreated control (1.67%) after 24 hours of spraying. In the residual toxicity assays, the highest mortality observed in Omite 57 EC (100%, 24.67% and 13.63%) but chilli extract provided the lowest mortality (3.33%, 3.33% and 0.00%) after 1st, 3rd and 7th days of spraying. Efficacy of botanicals was also provided satisfactory results in comparison to synthetic pesticides. Our present study showed that Omite 57EC, Kumulus DF and the botanical Mahgony oil performed better than other tested molecules to check the mite infestation.
Two spotted spider mite, vegetable, synthetic pesticides, botanicals