The Effects of Wooly Apple Aphid Infestation (Erriosoma Lanigerum, Hausmann) on Starch Partitioning in Apple Seedlings and Mature Apple Roots
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Two-year-old apple seedlings were infested with woolly apple aphids, Eriosoma lanigerum (Hausmann), for two months. They were then destructively sampled and their roots, stems and leaves were analyzed for starch content. There was little correlation between starch content and degree of infestation. Six-year-old orchard apple trees were uprooted in 1992 after six years of infestation with woolly apple aphids. Their galled and ungalled roots were analyzed for starch content. There was a correlation between a large amount of galling and lowered starch content. This was mostly likely attributable to the galls disrupting carbohydrate flow as carbohydrates travel through the root, but it is also possible that the galls act as an active mobilizing sink for carbohydrates.