5/15/18. The UW Insect Diagnostic Lab. Insect Diagnostic Lab. Japanese Beetle. Adult Behavior. PJ Liesch Extension Entomologist

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1 The UW PJ Liesch Extension Entomologist Website: labs.russell.wisc.edu/insectlab/ Established in late 70 s (40 years!) Managed by Phil Pellitteri for 36 years Services: arthropod identification & management recommendations Entomology outreach WPR; Radio/TV/Newspaper Blog: labs.russell.wisc.edu/insectlab/blog Events: WI Garden Expo, etc. Japanese Beetle Native to Japan Introduced to US in 1916 Adults can feed on 300+ plant species! Larvae (white grubs) live in soil, feed on roots of turfgrass and other plants Female beetles like to lay eggs in low-cut irrigated turf Adult Behavior Adults are gregarious Like sunny/warm areas Feeding starts in the upper canopy Skeletonize leaves 1

2 Burnett Polk St. Croix Pierce Douglas Washburn Barron Dunn Pepin Bayfield Chippewa Eau Claire Buffalo Trempealeau Sawyer Rusk La Crosse Ashland Grant Clark Jackson Vernon Monroe Taylor Price Richland Crawford Iron Iowa Wood Marathon Sauk Lincoln Vilas Oneida Portage Dane Langlade Rock Forest Oconto Menominee Shawano Dodge Marinette Waushara Manitowoc Winnebago Calumet Juneau Adams MarquetteGreen Lake Fond du Lac Sheboygan Lafayette Green Columbia Waupaca Florence Outagamie Door Kewaunee Brown Jefferson WaukeshaMilwaukee Walworth Washington Ozaukee Racine Kenosha 5/15/18 Japanese Beetle Grubs Larvae (a.k.a. grubs) are typical white grubs: Three pairs of jointed legs Yellowish-brown head capsule Typically assume a C-shaped body position Live in the soil Feed on plant roots Emerald Ash Borer Exotic, Invasive Species from China 2008: found in WI Larvae kill ash trees by feeding on vascular tissues beneath the bark Trees die within 1-5+ years depending on population density EAB in Wisconsin Early 2014 Dec 2017 Municipalities with 1 st EAB Detections Year # Municipalities Quarantined County Map Source: WI-DATCP Should you treat your tree(s) for EAB? Several factors to consider before to treating ash trees: Tree health Tree location Tree value Costs to treat Costs to remove See UW-Extension Factsheet XHT1215: EAB Management: hort.uwex.edu Is My Ash Tree Worth Treating for Emerald Ash Borer 2

3 Jumping Worms Invasive worms from SE Asia Amynthas sp. Crazy worms Highly adaptable Destroy soil texture and moisture-holding capacity Biology and Impacts Live at the soil-surface interface; feed on leaves, etc. Overwinter as cocoons Develop more quickly than our other earthworms ~60 days instead of ~120 days (2 generations/year) Can reproduce asexually (1 worm can start a population) 2013: First Detection 2017: ~40 Counties Jumping Worms in WI Management (?) Don t move plants, soil, compost, or mulch if you suspect jumping worms Check plants before purchasing Mow (mulch) leaves into lawn; mulch/compost on-site Buy compost/mulch from certified sources Clean landscaping tools before removing them No pesticides registered by the EPA for use on worms Lily Leaf Beetle European origin Detected in Montreal-1945 Detected in New England-1990 s Detected in Wausau-2014 Damage Irregular holes chewed in leaves Feeds on true lilies & a few others Fritillaries Lily of the Valley, Hollyhock, others Does not feed on daylilies 3

4 Lily Leaf Beetle Lily Leaf Beetle Management Start scouting early in the season: Overwinters as adults Physical: hand picking adults or squishing larvae Chemical: Carbaryl (Sevin), Bifenthrin, Cyfluthrin,Permethrin, etc. Organic: Pyrethrins, Neem oil Brown Marmorated Stink Bug Brown Marmorated Stink Bug Exotic, invasive insect from Asia Introduced to US in mid 1990 s Can attack agricultural crops, vegetables, fruit, ornamentals Can be a structural nuisance Gets into attics and crawl spaces First WI Find: : 30+ cases BMSB in Wisconsin Spotted Wing Drosophila Invasive pest of fruits, from Asia Found in WI: : Juveniles! Mating Adults 50+ reports : Locally common Dane/Rock Co SE WI Fox River Valley 4

5 SWD Damage SWD Host Plant Preferences Photo Credit: University of Maine Extension SWD Management Physical: Mesh Netting (pollinator access?) Sanitation, regular picking Choose earlier-maturing fruit Chemical control: Source: University of Minnesota 5