Change of the Density-Independent and Dependent Environmental Factors on The Population Dynamics of Bemisia tabaci and Empoasca fabae Under the Potato Agroecosystem

Ahmed, Omnia; .Atwa, Wedad, A.; Elshaier, Manal; H., Mohamed, G.; Elqady, Enayat M.

doi:10.21608/eajbsa.2022.275289

Change of the Density-Independent and Dependent Environmental Factors on The Population Dynamics of Bemisia tabaci and Empoasca fabae Under the Potato Agroecosystem

Document Type : Original Article

Authors

¹ Zoology and Entomology department, Faculty of Science, Al-Azhar University- Naser city- Cairo, Egypt.

² Plant protection research institute, Agriculture research center, Cairo, Egypt.

³ Zoology and Entomology department, Faculty of Science, Al-Azhar University- Naser city- Cairo, Egypt

10.21608/eajbsa.2022.275289

Abstract

Effect of density-independent factors (minimum–maximum temperatures and relative humidity) and density dependant factors ( plant age and natural enemies; Coccinella undecimpunctata, Chrysoperla carnea, Syrphus corolla, Eretmocerus eremicus and Orius laevigatus) of the environment on the population dynamics of Silverleaf whitefly, Bemisia tabaci (Genn.) and potato leaf hopper, Empoasca fabae (Harris) attacking potato plant Solanum tuberosum at El-Gharbia governorate, Egypt were investigated on autumn and spring plantation of 2019/2020 &2020/2021 seasons. The results revealed that the population fluctuation of B. tabaci & E. fabae recorded the highest infestation in December during both autumn seasons, while in both spring seasons the highest peak for the two pests was reached in May. The combination of abiotic and biotic environmental factors on population densities of B. tabaci and E. fabae was effective as the explained variance (E.V.) values were (88% - 92%) and (85% - 86%) for B. tabaci, while E.V. was (94% ^_ 91%) and (92% - 77%) for E. fabae during autumn and spring of the plantation 2019/2020 &2020/2021 seasons, respectively. The present research can be helpful to the ecological characteristics of main potato pests to obtain more effective pest management.

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