Toxic and repellent potentials of spinosad against Cryptolestes pusillus (Schon.) (Coleoptera: Cucujidae)
Institute of Biological Sciences, University of Rajshahi, Bangladesh.
Research Article
International Journal of Biological and Pharmaceutical Sciences Archive, 2022, 03(02), 074–083.
Article DOI: 10.53771/ijbpsa.2022.3.2.0042
Publication history:
Received on 17 March 2022; revised on 26 April 2022; accepted on 28 April 2022
Abstract:
The contact and gustatory effects of spinosad on the mortality and repellency of Cryptolestes pusillus (Schon.) were conducted under laboratory conditions. Spinosad at 0.32 l/g caused lowest mortality (16.67±1.67% of 2nd instar larva of C. pusillus in wheat after 24h and highest mortality (59.14±1.65%) was observed at 1.25 l/g in wheat after 72 h exposure. The LC50 value was 0.11 l/g in wheat after 72 h, which indicated that spinosad is highly toxic against the 2nd instar larvae of C. pusillus. In case of 4th instar larvae highest mortality (58.12±3.45%) were observed at 1.25 l/g concentration but lowest 10.00± 2.10 after 24 h exposure. The highest mortality was observed (40.00±2.88%) in adults. The different doses (1.25, 0.63, 0.32, 016 and 0.08 l/ml) of spinosad showed repellent activities against adults of C. pusillus. All the doses of spinosad offered 0.1% level of significance (P<0.01). Spinosad used in this experiment have great potential in the control of C. pusillus which is important from the Integrated Pest Management and the Global Environmental Protection point of views.
Keywords:
Toxicity; Repellent; Spinosad; Cryptolestes pusillus; Wheat
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