Impact of the Parasitoid, Diaeretiella rapae (McIntosh) on Crucifers Aphid in Egypt and Iraq.

Saleh, Ahmed A.A.; Jabbar, Ahmed. S.; Amer, Said. A.M.; Zawrah, Mohamed F.M.

doi:10.21608/eajbsf.2021.243112

Impact of the Parasitoid, Diaeretiella rapae (McIntosh) on Crucifers Aphid in Egypt and Iraq.

Document Type : Original Article

Authors

¹ Plant Protection Res. Inst., A RC, Giza, EGYPT

² Plant Protection Dept., Fac. Agric. AL - Muthanna Univ., IRAQ

³ Faculty of Desert and Environmental Agriculture, Matrouh University, Fuka, Egypt

10.21608/eajbsf.2021.243112

Abstract

The present study was conducted to survey and count the population density of parasitoids on crucifers aphid infesting cabbage plants in Egypt and, Iraq during the two seasons 2019-20 and 2020-21.
            Three parasitoids, one primary D. rapae and two hyperparasitoid, Pachyneuron sp. andAlloxysta sp., were recorded. Diaeretiella rapae was highly dominant (91.37 and 88.39%) in Egypt and (94.00 and 91.03% )in Iraq during the 2019-20 and 2020-21 seasons.
            The highest parasitism rate in Egypt was 92.39% recorded in the 2019-20 season and 95.65 % in the 2020-21 season. Meanwhile, in Iraq it was77.78% recorded in the 2019-20 season while it was 53.33 % in the 2020-21 season. The life cycle of D. rapae was 17.43±0.91 days at 18.00°C ±1°C and 65 ±5RH%. The sex ratio (Female: Males) was 2.47 :1. By rearing D rapae for two generations, the sex ratio was almost 1:1 in two generations.
             This investigation may be helpful in implementing the use of parasitoids as biological control agents in integrated pest management programs for aphids on cabbage.

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