The present work was conducted to survey and study the seasonal abundance of different aphid insects infesting some leguminous plants varieties (broad bean, pea, cowpea and bean plants) in Diarb-Nigm district, Sharkia Governorate, Egypt during 2014/15 and 2015/16 seasons. The aphids species were collected by using plant samples from leguminous plants. Results showed that aphid species infested leguminous vegetable plants were Aphis craccivora Kock, Myzus persicae (Sulz) Acyrthosiphon pisum (Harris) and Aphis gossypii Glov. Two peaks of high population density for A. craccivora, M. persicae and A. pisum occurred on broad bean and pea plants during the fourth week of January and the first & second week of March. While in case of cowpea and bean plants two peaks of population density for A. craccivora, M. persicae and A. gossypii were recorded at the second week of July and the second week of August, respectively. Varieties such as broad bean, pea, cowpea and bean plants influenced the population density of aphids insects, Improved Giza 3 broad bean, Mastar B pea, Cream7 cowpea and Bronco bean varieties showed lowest mean number of insects/sample. Chemical analysis results showed a positive relationship between protein & carbohydrate contents and aphid insects infestations on all tested leguminous plant varieties, while a reverse relationship between pH values & aphid insects infestations and also with quantity of yield was also shown.
Laboratory experiments were carried out to study the influence of different mealybug species as preys on the biological aspects of Rodolia cardinalis (Mulsant) in the insectary of the Economic Entomology, Faculty of agriculture, Mansoura University.The larval stage of the predator R. cardinalis when reared at 24±1˚c and fed on the third nymphal instars of Icerya purchase Mask., Icerya aegyptiaca Douglas and Icerya seychellarum (Westwood) lasted an average of 14.5±0.60, 11.8±0.34 and 16.6±0.55 days, respectively.The average of the total consumption for larval instars at 24±1˚c and fed on I. purchasi, I. aegyptiaca and I. seychellarum as preys reached 68.90±4.01, 60.50±2.18 and 42.65±1.77 individuals. Meanwhile, results indicated that, the highest total consumption for the predator larvae during its larval stages when fed on I. purchasi followed by I. aegyptiaca and I. seychellarum with significant differences. The calculated biomass from (carbohydrates, lipids and protein) consumed by a larva when fed on I. purchasi, I. aegyptiaca and I. seychellarum reached an average of (88.88, 85.44 and 49.61 mg), (80.47, 77.44 and 45.98 mg) and (49.90, 49.05 and 28.15 mg), respectively.The adult longevity for female and male when reared at 24±1˚c and reared on the third nymphal instar of I. purchasi, I. aegyptiaca and I. seychellarum lasted an average of (40.5±2.25 and 26.8±1.72 days), (46.4±2.12 and 29.0±2.09 days) and (32.5±2.60 and 20.8±1.8 days), respectively.The average of the total consumption for adult female reached 263.2±11.25, 328.2±10.90 and 208.7±6.88 individuals/ female when fed on I. purchasi, I. aegyptiaca and I. seychellarum, respectively, with highly significant differences. The calculated biomass from (carbohydrates, lipids and protein) consumed by one predator female during its longevity reached
The present study was conducted in the privet apiary established at Kafr Saad distances, Damietta Governorate, North Egypt, during summer season of 2019, (July and August). The experiments were carried out to determined the effect of genetic origin of the grafted larvae, (Apis mellifera carnica and Apis mellifera bukfast) and level of bar at which the queen cells hung within rearing frame, (top, medium and bottom levels) and the position of these cells on the rearing bar (middle and peripheral positions) on some output parameters concerned in commercial queens production. The genetic origin of larvae used in grafting process has a positive and significant effect on their acceptance percentage and the live weight of the produced queens when nursed by related starter and finisher building colonies. The percentages of acceptance, sealing and queen emergence as well as the weight of newly emerged virgin queens slightly influenced by the level and position at which the cells presented. In general, queen cells on the bottom bar and middle position were attained a little performance than the others in the commercial queen production during summer season of North Egypt.
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