What specific damage symptom is associated with root-feeding woolly apple aphid forms below ground?
Answer
Formation of galls or swellings on the roots compromising structural integrity.
When certain woolly aphid species, like the root-feeding form of the woolly apple aphid, attack underground structures, the damage manifests as abnormal tissue growths on the roots. These growths are referred to as galls or swellings. The formation of these galls compromises the physical structure of the root system, leading to weakened support for the tree and significantly impairing the plant's crucial ability to absorb necessary water and nutrients from the soil.
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