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Journal of Entomology

Year: 2016 | Volume: 13 | Issue: 5 | Page No.: 187-192
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Authors

Lamya Ahmed Al-Keridis

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Research Article

Biological Responses of Aphis gossypii (Glover) to Different Squash (Cucurbita pepo) Varieties and Two Acaricides Application

Lamya Ahmed Al-Keridis
Background: Aphis gossypii (Glover) is one of the most important sucking insects causing severe damage for squash plant since their nymphs and adults continuously suck the phloem sap of the leaves and more seriously is the fact that such insects are potential vectors of plant viruses. Materials and Methods: The present investigation was an attempt to evaluate the biological responses of Aphis gossypii (Glover) to different squash (Cucurbita pepo) varieties: Lebanese, Arab Marrow, Alma and Caserta. The experiments were performed under controlled greenhouse conditions. Biological and reproductive variables of nymph have been assessed throughout the entire course of the experiment. Furthermore, study of the effect of acaricides on the population density of melon aphid was addressed when two acaricides (Torque L550 Sc and Nerot 25% E.C.) were employed. Data were analyzed using JMP software with analysis of variance (One-Way ANOVA). Results: The present findings indicated remarkable variations among the varieties studies regarding the Aphis gossypii biology, where Lebanese ranked the most preferred varieties to A. gossypii and Caserta variety was the least preferred one since the total duration of nymph stage for Caserta was longer in most stages (first, second and third) compared with Lebanese which required less time to conclude this phase. Furthermore, Lebanese showed no reductionin the population rate reflecting the suitability of this cultivar for the growth of A. gossypii. On the other hand, aphids showed different response to the different acaricides applied and time to kill the aphids was positively correlated to the concentration of applied acaricides. Conclusion: The overall results provided convincing evidence for the effect of plant species on the biology of Aphis gossypii, which was also partially influenced by acaricides application. Further experimental work is required to explore the mechanisms behind variation in biological sensitivity of Aphis gossypii to different plant species and varieties. The actual action of acaricides on Aphis gossypii is still a mystery.
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Afrah Mohammed Reply

Please check the word acaricide it is written in worong way in some places,,

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