There is are several knots on the roots. Is this root knot?
Root nodules caused by wooly aphid, which is the cotton-looking stuff. You should be planting on wooly aphid-resistant rootstock such as M111 or some other Northern Spy offspring.
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So I searched for Wooly Aphid and looked at some pics and I have seen Wooly Aphids on several of my other trees (on the limbs). The recommended treatment was water/soap or pruning. The cotton look stuff as you described is on the root - below ground. Is there anything to treat this?
My trees are on M111, MM106, B118, G.935, G.41 and I have trees on order that are G.11 and G.222. I will check the resistance of each. The tree in the pic came from Stark Bros so the rootstock is unknown. I dug it up because it did not grow much this year or last. Thank you for your help.
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The aerial colonies infect pruning wounds or other tender places, and are only a nuisance. The underground colonies are what stunt the tree, and there’s no treatment for it other than resistant rootstock.
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I checked my rootstock and it seems that G.935 is not wooly aphid resistant and I cannot find anything on B118 rootstock. Anyone know if B118 is Wooly Aphid resistant? I only have one tree on G.935 and one on B118 but I ordered 6 B118 rootstock for next year. I will cancel the order if the B118 is not Wooly Aphid resistant,
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