[Studies on potential natural enemies for biological control of some major insect pests in UAE]
1985
Ba-Angood, S.A. (Kiliyyat na:s*ir li-l-3ulu:m al-zira:3iyyat (Yemen, D.). Qism al-wiqa:yat)
The present study reports on a survey of natural enemies where over 20 species of predators and parasites were collected in the period 1982-1983. Efficiency of some of these natural enemies was studied. Parasitism of Aphidius spp and Aphelinus spp on aphids ranges from 60-90% in greenhouses: Percentage of parasitized aphids ranges - in the field - from 5-30%. Calosoma chlorostictum, a predator, consumed 1-2 grasshoppers or 2-6 caterpillars or 2-6 maggots or 1-2 crickets daily. Each larva and adult of Coccinella septempunctata consumed 3-31 and 3-7 aphids per day, respectively; while Chrysoperla carnea larva consumed 4-40 aphids daily. Observations on the behaviour of Sphex ichneumoneus showed that there were 6-14 nests in 10m2 shelter. Each nest consisted of 1-23 cells and the number of caterpillar preys (Spodoptera spp) in each cell ranged from 2-9 larvae. Studies on the biology of this predator showed that the duration from egg laying to adult emergence took 25-45 days
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