Category: Galls
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Posted on May 21, 2014
Gall Wasp
Extension Bulletin
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Gall Midge on Boxelder
Many plants have distorted growths caused by insects during the spring. This box elder has Cecidomyid gall midges that cause the leaf curl. If you […]
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Erineum on Virburnum
We often see the velvet-like growth of eriophyid mite galls on silver maple and river birch. Every once in a while we’ll see similar symptoms […]
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Erineum on River Birch
Extension Bulletin
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Erineum on Maple
Extension Bulletin
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Posted on May 20, 2014
Wool Sower
An unusual gall on oaks is the “wool sower gall”. These galls can be several inches across and have a fuzzy, cottony texture. Many seed-like […]
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Posted on May 16, 2014
Spruce Galls
Odd swellings on the twigs of spruce and certain other conifers can be galls associated with tiny aphid-like creatures known as adelgids. In some cases, […]
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Posted on May 8, 2014
Pear Leaf Blister Mite
Funny bumps on pear and plum leaves are caused by an Eriophyid mite called Pear Leaf Blister Mites. The injury may start as a reddish […]
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Oak Spangles
Extension Bulletin
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Noxious Oak Gall
These galls appear on the leaves of swamp white oak. Leaves can be severely curled and will possess a round pod-like structure. Extension Bulletin
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Maple Bladder Gall
Extension Bulletin
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Linden Wort Gall
Extension Bulletin
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Hickory Pouch Gall
Odd lump-shaped galls on hickories are caused by an insect called the hickory pouch gall aphid. The gall began forming as the leaves developed. When the […]
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Posted on May 7, 2014
Hedge Hog Gall
Extension Bulletin
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Grape Tube Gall
Slender “tube” galls on grape leaves are the result of tiny flies. Despite the odd appearance, these galls are simply a cosmetic issue.
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Grape Phylloxera
The funny bumps on grape leaves are caused by the grape phylloxera. This insect has a complicated life cycle and is found on both the […]
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Posted on March 7, 2014
Birch Bud Gall
Extension Bulletin
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Ash Flower Gall
Odd-looking green or brown clumps in ash trees are galls caused by tiny Eriophyid mites. Although these clumps look odd, they are a cosmetic issue […]
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Apple/Pear Blister Mite
Funny bumps on pear and plum leaves are caused by an Eriophyid mite called Pear Leaf Blister Mites. The injury may start as a reddish […]