تقدير كفاءة بعض المبيدات الحشرية على الدودة الخبيثة (Biosd.)  Spodoptera littoralis ( Lepidoptera: Noctuide )

Salma S. Moftah; I. O. El-Awami I. O. El-Awami; Ramadan E. Abdel-kader

doi:10.54172/mjsc.v11i1.459

Authors

Salma S. Moftah Department of Plant Protection, Faculty of Agriculture, Omar Al-Mukhtar University, Al-Bayda - Libya
I. O. El-Awami I. O. El-Awami Department of Plant Protection, Faculty of Agriculture, Omar Al-Mukhtar University, Al-Bayda - Libya
Ramadan E. Abdel-kader Department of Plant Protection, Faculty of Agriculture, Omar Al-Mukhtar University, Al-Bayda - Libya

DOI:

https://doi.org/10.54172/mjsc.v11i1.459

Abstract

Different effects of three insecticides were studied on the fourth larval instar of the cotton leaf worm, Spodoptera littoralis (Biosd.) Susceptible and field strain. Two compounds are organophoshorus insecticides, Pirimiphos-methy (Actellic) and Chlorpyrifos (Dursban ). The third tested compound was the insect growth regulator (IGR), Nomolt ( Teflubezuron) these insecticides are being recommended in many international programs to control many pest including the cotton leaf worm. The toxicity of the three previous compounds were studied. Mortality percentage, pupation percentage, number of pupae that failed to develop, number of normal and abnormal pupae, number of abnormal adult, rate of inhibition of adult formation and the number of dead adults also was determined. The LD₅₀ and LD₉₀ of three insecticide were determined so the resistance for Chlorpyrifos was increased in the field strain with 55.8 times. And to the pirimiphos-methyl action increased 63.3 times in the field strain, the resistance of field strain to Teflubenzuron indicate that it was not significant. When the Chlorpyrifos and Pirimiphose- methyl was mixed with Nomolt caused additive effect. The Chlorpyrifos doses caused abnormality in the produced pupae and adults and the living larvae field with the percentages ranged from 35.6% to 80%, while the inhibition of the adult formation ranged from 60 to 100% according to the tested dose. Also, in the case of pirimiphos-methyl, the abnormal pupae and adults were produced and the percentages of the inhibition of pupation were ranged from 34.1 to 83.3% while the inhibition of adult formation was ranged from 60 to 100% according to the tested dosage. On the other hand, Teflubenzuron dosages produced juvenilized larvae and also abnormal pupae and adults. The percentages of failed pupae were ranged from 40.1 to 100% and from 31.1 to 81.8% in the susceptible and field strain, in respect, wile the inhibition in the adult formation ranged from 78 to 100% and 68 to 100% in the susceptible and field strain respectively.

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Author Biography

Salma S. Moftah, Department of Plant Protection, Faculty of Agriculture, Omar Al-Mukhtar University, Al-Bayda - Libya

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