Youssef,, M., Fahmy, A. (2024). Effect of Sowing Dates of Egyptian Clover on the Population Density of Hypera brunneipennis and some Natural Enemies at Sohag Governorate. Journal of Plant Protection and Pathology, 15(9), 241-246. doi: 10.21608/jppp.2024.309396.1248
M. A. M. Youssef,; A . M. Fahmy. "Effect of Sowing Dates of Egyptian Clover on the Population Density of Hypera brunneipennis and some Natural Enemies at Sohag Governorate". Journal of Plant Protection and Pathology, 15, 9, 2024, 241-246. doi: 10.21608/jppp.2024.309396.1248
Youssef,, M., Fahmy, A. (2024). 'Effect of Sowing Dates of Egyptian Clover on the Population Density of Hypera brunneipennis and some Natural Enemies at Sohag Governorate', Journal of Plant Protection and Pathology, 15(9), pp. 241-246. doi: 10.21608/jppp.2024.309396.1248
Youssef,, M., Fahmy, A. Effect of Sowing Dates of Egyptian Clover on the Population Density of Hypera brunneipennis and some Natural Enemies at Sohag Governorate. Journal of Plant Protection and Pathology, 2024; 15(9): 241-246. doi: 10.21608/jppp.2024.309396.1248
Effect of Sowing Dates of Egyptian Clover on the Population Density of Hypera brunneipennis and some Natural Enemies at Sohag Governorate
1Field Crop Pests Department, Plant Protection Research Institute, Agricultural Research Center
2Plant Protection Department, Faculty of Agriculture and Natural Resources, Aswan University
Abstract
The Egyptian clover (Berseem), Trifolium alexandrinum L., is the main cultivated winter fodder legumes Crops in Egypt. Egyptian alfalfa weevil (EAW), Hypera brunneipennis (Bohemian) (Coleoptera: Curculionidae), considered one of the most important economic insect pests that attack Berseem in Egypt. The effect of the sowing dates of (T. alexandrinum L.) on the population density of H. brunneipennis and certain associated predators was studied. There were a significant differences between the five planting dates in the mean numbers of the H. brunneipennis, The first planting date recorded the highest mean number of insects during both seasons. The fifth planting date recorded the highest mean number of Coccinella undecimpunctata 5.42 and 14.18 individuals for both 2022/2023 and 2023/2024 seasons, respectively. In the first season, the fifth planting date was highest in the mean number of Syrphus corollae recorded. However, in the second season, the fourth planting date recorded the highest mean number of insects. The highest mean number of Chrysoperla carnea was recorded at the fourth planting date at the first season. However, at the second season, the highest mean number of insect was recorded at the first planting date. There is a high significant positive correlation in 2022/2023 season between C. undecimpunctata and alfalfa weevil at the first and the second planting date. The simple correlation between Ch. carnea and H. brunneipennis in 2022/2023 season was highly significant positive at the first and the second planting dates.
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