Comparative Toxicity of Some Insecticides Against Pectinophora gossypiella (Saunders) and Chrysoperla carnea (Stephens) | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 7, Volume 7, Issue 6, June 2016, Page 391-395 PDF (464.41 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2016.50607 | ||||
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| Author | ||||
Hemat Z. Moustafa 
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| Plant Protec. Res. Inst. (PPRI), Agric. Res. Center (ARC), Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| Comparative toxicity of four insecticides against the pink bollworm Pectinophora gossypiella (Saunders) as well as the predacious insect, Chrysoperla carnea (Stephens) were evaluated under laboratory conditions. Field recommended concentrations of the tested insecticides were used in this study. For P. gossypiella, the ovicidal action of the tested insecticides revealed that the three days old eggs were more effective than the one day eggs with the exception of Dimilin treatment where the one day old eggs showed slightly more susceptible than three days old eggs. Concerning one day old eggs, the highest ovicidal activity was noticed in case of Dimilin treatment where the eggs hatchability exhibited 82.61% with reduction of 9.67% compared with untreated eggs, whereas, Axon insecticide caused the highest ovicidal effect on three days old eggs where the corresponding eggs hatchability recorded 77.33% with reduction of 16.07% compared with the untreated eggs. On the other hand Spintor showed the least effect on one and three days old eggs. The corresponding eggs hatchability were 89.47 and 88.00% with reduction rate of 2.17 and 4.49%, while the eggs hatchability rates in untreated eggs one and three days old were 91.45 and 92.14%; respectively. The same trend of the ovicidal activity associated to the exposure of one and three days old eggs of the predatory insect to the tested insecticides. Whereas the ovicidal action was much remarkable higher in case of the predatory insect eggs than the pink bollworm eggs. According the effect of tested insecticides on the pupal stage of the pink bollworm and the predatory insect and their latent effect on the biotic potential of the two target organisms, Axon was the superior insecticide against one and three days old pupae of the two targets. Followed by Dimilin against one and three days old pupae C. carnea. Dimilin showed the highest latent effect on the pink bollworm male adult and lowest latent effect on the female adult resulted from the two aged pupae. Spintor and Pasha caused lowest latent effect on C. carnea adult emergence. Axon and Dimilin showed highest latent effect on both P. gossypiella and C. carnea egg hatchability. | ||||
| Keywords | ||||
| Pectinophora gossypiella; Chrysoperla carnea; toxicity; biology | ||||
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