[Preliminary field observations on the ecology and biology of the apricot leaf aphid, Hyalopterus pruni G (Homoptera: Aphididae) in Mosul region - Iraq]
1990
Mohammad, M.A. | Al-Mallah, N.M.
Preliminary field observations were conducted on the ecology and biology of the apricot leaf aphid, Hyalopterus pruni G. (Homoptera: Aphdidae) for one season extending from September, 1985 until June, 1986 at the horticulture orchard of the College of Agriculture and Forestry in Hammam Al-Alil. Few aphids occurred on the trees during the first week of March, and aphid population reached a peak by the 3rd week of April. Population declined gradually thereafter until the pest disappeared completely by the 2nd week of June. Apricot trees were relatively more susceptible to infestation while greengage was the least susceptible. A significant correlation between aphid population and temperature was recorded, while the relationship between relative humidity and population was insignificant. The pest overwintered as eggs. A significant and positive correlation existed between temperature and the percentage of actual hatching, while the effect of both temperature and relative humidity on egg mortality was insignificant. Concerned aphid species migrated to a secondary host (Phragmitis communis Trin.) from June until early November, then the sexual forms emigrated again to the primary host (stone-fruit trees) for mating and laying eggs around buds and in bark crevices
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