Curious Galls on Muscadine Vine

Recently, a muscadine vine cane was brought into the lab after pruning. It had galls along the cane at nearly every node. Grape cane gallmaker (http://nysipm.cornell.edu/factsheets/grapes/pests/gcgm/gcgm.pdf) may be the culprit, but there are other types of gall making insects around as well that could cause similar injury.  We were not able to find any evidence of larvae, frass, or any other trace of the insect. The injury to the cane is quite extensive, but luckily only a very few canes were harmed.  Thus, it is not worth trying to control this insect, as it would not create economic-scale damage to the vine or to yields. See the photos below.

Galls on cane of a muscadine vine

Galls on cane of a muscadine vine

Closer image of the galls. No evidence of the pest was found (aside from the swelling).

Closer image of the galls. No evidence of the pest was found (aside from the swelling).

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