Fourlined Plant Marauders

Fourlined Plant Bugs are one of the sneakiest, quickest hitting spring pests found in Ohio. Hordes of hungry nymphs and adults descend seemingly out of nowhere to cause extensive leaf damage, then they just fade away leaving behind their foliar wreckage.
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Authors
Joe Boggs

Holey Oaks and Chestnuts

The holey handiwork of the Oak Shothole Leafminer (Japanagromyza viridula, syn. Agromyza viridula) is appearing on its namesake hosts in southern Ohio. Similar damage may be seen on Chinese chestnuts (Castanea mollissima). The leafminer is a small fly belonging to the family Agromyzidae; the leafminer flies.
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Authors
Joe Boggs

Holey Elms

Elm Flea Weevils (Orchestes steppensis) produce three types of damage on their namesake host: holes in the leaves, distorted leaves, and blotch-type leafmines. The three symptoms are currently on display in southern Ohio.
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Authors
Joe Boggs

Major Miner on Elm

The leaves of elms may be turning brown in southern and central Ohio thanks to the leafmining activity of the Elm Leafminer Sawfly, Fenusa ulmi (= Kaliofenusa ulmi). The sawfly larvae undergo rapid development, so damage occurs quickly.
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Authors
Joe Boggs

Another Interesting Oak Gall: the Roly-Poly

One of the most unusual galls found on oaks is the light green, ball-like Roly-Poly Galls produced under the direction of the gall wasp, Dryocosmus quercuspalustris (family Cynipidae). The specific epithet reveals one of the most common hosts of this gall-making wasp: Quercus palustris is the scientific name for Swamp Spanish Oak (a.k.a. Pin Oak) with palustris being Latin for “swampy” or “marshy.”
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Authors
Joe Boggs

Oak-Apples are Growing

There are somewhere around 800 different types of arthropod galls found on oaks in the U.S. About 700 are produced by tiny wasps (order Hymenoptera) belonging to the family Cynipidae. Of those, only a handful represent a serious threat to the overall health of their oak hosts.
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Authors
Joe Boggs