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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comWhat causes black warts on the stems of Wisteria?
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[1] https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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1 Comment To "causes of black nodules wisteria stems"
#1 Comment By Nikki On 12/22/2014 @ 2:00 pm
It is not uncommon for roots of wisteria to have black-looking nodules on them but on the stems, this could be attributed to pests or a fungus. I would recommend treating with neem oil. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm [1]