The role of predators and parasites in controlling populations ofEarias insulana,heliothis armigera andBemisia tabaci on cotton in the Syrian Arab Republic |
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Authors: | P A Stam H Elmosa |
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Institution: | (1) FAO Representative, GCP/SUD/025/NET, P.O.Box 1117, Khartoum, Sudan;(2) Agricultural Experiment Station, University of Jordan, Amman, Jordan |
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Abstract: | Studies on the relationship between insect pests and their predators and parasites were conducted in the Syrian cotton agro-ecosystem
from 1980 up to 1983.Earias insulana (Boisduval) was found to be the most damaging pest, whileHeliothis armigera (Hübner) was not an annual returning problem. Among the entomophagous insects found, coccinellids were most numerous during
the months June and July and the hemipterous predators were more abundant during August and September.
When predator numbers were reduced with insecticide applications, a significant increase in the bollworm populations occurred,
resulting in significant reductions in seed cotton yields. Parasites were relatively not important for the control of lepidopterous
pests on cotton. Egg and larva populations ofE. insulana andH. armigera were parasitized byTrichogramma spp. andHabrobracon brevicornis Wesmael respectively. Populations ofBemisia tabaci (Gennadius) were heavily parasitized byEretmocerus mundus Mercet.
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Keywords: | Population dynamics integrated pest management cotton pests predators parasites Syria biocontrol |
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