Volume 6, Issue 4 (winter 2003)
jwss 2003, 6(4): 195-207 |
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S. Ghadiri Rad, B. Hatami, G. Asadi. Biology of Leucopis glyphinivora Tanas. (Dip.: Chamaemyiidae) and its Efficiency in Biological Control of Aphis fabae Scop. jwss 2003; 6 (4) :195-207
URL: http://jstnar.iut.ac.ir/article-1-147-en.html
URL: http://jstnar.iut.ac.ir/article-1-147-en.html
Abstract: (18053 Views)
The biology of predatory fly, Leucopis glyphinivora Tanas. was studied under greenhouse conditions. Adult longevity was 8 days and the average fecundity was 35.7 eggs. Incubation period, the 1st, 2nd, 3rd larval instars and puparium duration averaged 2.7, 2.16, 3.48, 5.7 and 8.45 days, respectively. Each generation lasted about one month. The predator efficiency was studied by applying the egg together with the adults of A. fabae at ratios of 1:1, 1:2, 1:4, 1:8 and 1:16 on broad bean. First larval instar was exclusively feeding on small nymphs (1st and 2nd nymphal instars) of aphid. Predator:prey ratios of 1:4, 1:8 and 1:16 decreased the number of prey to 97.9%, 98.8% and 61%, respectively, but ratios of 1:1 and 1:2 were unsuccessful in decreasing the number of preys due to predatory larvae leaving the host plant for searching small nymphs of aphid. As a result, the predatory larvae were efficient merely in a particular range of aphid density and age structure.
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