[Ecological and biological studies on the rose aphid Macrosiphum rosae (L.) (Homoptera, Aphididae) in Mosul region [Iraq]]
1987
Mohammad, M.A. | Al-Mallah, N.M. (J"a:mi3at al-maws*al (Iraq). Killiyat al-zira:3at wa-al-g"aba:t)
Ecological and biological studies on the rose aphid, Macrosiphum rosae (L.) were carried out under laboratory and field conditions at the College of Agriculture and Forestry-University of Mosul during the year 1986. Seasonal abundance began at the 2nd week of February and disappeared completely by the 2nd week of June with a peak at the 1st week of April. There was a significant correlation between aphids number and temperature, while the correlation with humidity was insignificant. There was a significant variation between generations with regard to the biological characteristics under study (e.g. nymphal stage, adult longevity and fecundity). The nymphal stage passed through four instars: the first was of the longest duration and the second was the shortest duration. The intrinsic rate of natural increase in population (rm) under laboratory condition for the second generation was higher (0.319) than the corresponding rate for the first generation due to shorter prereproductive period (9.2 days) and higher fecundity (52.63 individuals/adult). rm values for the two generations under laboratory and field conditions were similar (0.27)
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