Impact of ecological conditions on population dynamic of Phenacoccus solenopsis Tinsley and associated predators in sweet potato fields ELBeheira Governorate, Egypt
Keywords:
Phenacoccus solenopsis, sweet potato, predatorsAbstract
The mealy bug, Phenacoccus solenopsis and the two spotted spider mite, Tetranychus urticae are a highly polyphagous sap sucking pests, without a hibernation period, as both are active all the year round. They are destructive pests of important vegetables and field crops. The present study was carried out at Rasheed region, Beheira Governorate during 2021 and 2022 seasons, to monitor the population fluctuations of mealybug and its predators; Coccinella undecimpunctata L., Chrysoperla carnea Steph, Scymnus spp. and Hippodamia tredecimpunctata in the first season, the infestation of P. solenopsis started on sweet potato plants at low numbers, the population increased gradually to reach its highest peak during 30th July (115.00 individual). This peak was followed by a relatively high population of the three predators, C. undecimpunctata (4.00 individual), Ch. carnea (8.00 individ.), Scymnus sp. (3.00 individ.) and H. tredecimpunctata (2.25 individ.). The second peak of the pest was detected on 21st Aug. (259.05 individual), synchronized with the peaks of the four, predators. During 2022, the first incidence of the mealybug was recorded on 30th July (114.97individ.). This peak was associated with the peaks of the four predators. The second peak of P. solenopsis was observed on 28th Aug. (196.50 individ.), it coincided with the peaks of the four predators. The infestation of P. solenopsis and T. urticae and their predators were highly significantly correlated with weather factors (Min.°c. and RH).
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