Population Density of Aphelinus mali1 , a Parasite of Eriosoma lanigerum2 in Iraq

Invasion Genetics of Woolly Apple Aphid (Hemiptera: Aphididae) in China

“…Colonies often show a peak of population growth in July, followed by a decrease in August and September, a possible second peak in October, followed by a sharp decrease in winter (Lohrenz 1911, Evenhuis 1958, Bonnemaison 1965, Kozár et al 1979, Walker 1985, Brown and Schmitt 1994. In warmer regions, aerial colonies can be present in small branches throughout the year with no discernable pattern, except for a population decline in winter or in summer (Hoyt and Madsen 1960, El-Haidari et al 1978, Asante et al 1993). …”