Insect Highlights

Insect Highlights for the Week of July 1, 2008.

nursery web spider
Nursery Web Spider

gypsy moth
Fishing Spider


We have three groups of common large spiders in the state- the wolf spiders, - nursery web spiders and Fishing spiders- With legs they can be over three inches long- but the rule with spiders- They big ugly ones are harmless in Wisconsin. For information on dangerous spiders see


dead gypsy moth
Dead Gypsy Moth

fungus killed gypsy moth
Fungus killed Gypsy Moth


One of the benefits of the heavy rains in June- there is evidence it promoted a moderate outbreak of the Entomophaga pathogen. This fungus disease needs high humidity to work and I have seen trees with hundreds of dead larvae on the trunks and very little defoliation. Fungus killed larvae die in a vertical position. Spores will be released to infect next years larvae.


elm flea weevil
Elm Flea Weevil

flea weevil damage
Flea Weevil Damage


The European elm flea weevil ( Orchestes alni) continues to expand its range in Wisconsin. First found in the far south east we have seen moderate activity in Jefferson and Dane county in 2008. It prefers hybrids and Siberian elms that have Asian genetics. Damage is mostly cosmetic and trees but trees need to be treated in May with spays or systemic insecticides to be effective.

more flea weevil damage
More Flea Weevil Damage

japanese beetle
Japanese Beetle


The first Japanese beetle adults were seen this week in Madison. For the next 2 months Grapes, roses, birches, lindens, raspberries and lots of other plants will have to face the feeding damage cause by the migrating adults- for background see Beetle-Lab note.pdf



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237 Russell Labs
1630 Linden Drive
Madison, WI 53706

For more information contact: 
Phil Pellitteri, 608/262-6510
or e-mail Phil Pellitteri.