DISTRIBUTION AND SEASONAL PHENOLOGY OF BLUEBERRY APHIDS (ILLINOIA PEPPERI (MACG.)) IN MICHIGAN
An aphid, Illinoia pepperi (MacG.), can be found on highbush blueberry (Vaccinium corymbosum cvs.) in most commercial plantings in Michigan. It has also been collected on wild Vaccinium species (mainly V. angustifolium) in many counties of the state. Populations tend to be much greater on cultivated blueberry. Five morphological forms of the aphid appear during its seasonal phenology. These are the apterous fundatrix, apterous viviparous adult, alate, viviparous adult, apterous oviparous adult and alate adult male. Overwintering eggs hatch in May and develop into viviparous funatrices. Their progeny become either alate or apterous viviparous adults. Fecundity of viviparous forms declines as the season progresses. Alates are most common in the 2nd and 3rd generations, during June. Viviparous forms continue until late fall when the sexual forms appear; these mate and lay the overwintering eggs. Within-bush distribution is heavily influenced by plant phenology and the location of succulent growth. Biological control agents and abiotic factors such as rain storms affect aphid populations and aphid distribution within the plant canopy.
Elsner, E.A. and Kriegel, R.D. (1989). DISTRIBUTION AND SEASONAL PHENOLOGY OF BLUEBERRY APHIDS (ILLINOIA PEPPERI (MACG.)) IN MICHIGAN. Acta Hortic. 241, 330-332