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Do You Have Japanese Beetles? Japanese Have You Do Plants, Some 300 and Creeper Virginia on Roses, Feed They to Miss

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Do You Have Japanese Beetles? Japanese Have You Do Plants, Some 300 and Creeper Virginia on Roses, Feed They to Miss JUN Do you have Japanese beetles? Adult beetles are hard to miss. They feed on roses, Virginia creeper and some 300 plants, | leaving holes and damaging leaves, flowers and fruit. Young grubs develop underground and JULY JULY typically eat grass roots. A softball-sized patch of brown grass is a sign of hungry grubs. Know your bug: Popillia japonica Lifespan: 1 year, though adults live about 30 to 45 days Reproduction: Females lay 40-60 eggs Threat: Feeds on 300 species of plants, | AUG loves watered lawns July: Adults mate. Females lay eggs in the ground no more than 3-inches deep LARVAL STAGE Eggs hatch after two weeks. | August: UNDER GROUND SEP Grubs feed on grass roots for 3-4 weeks Fall-winter: Grubs burrow 8-10 inches or Credit: Whitney Cranshaw, Colorado State University below frost line during winter | CSU Q&A: bit.ly/CSUJapBeetle OCT April-June: Grubs head back to surface but stay underground to feed on roots and CSU Extension: bit.ly/CSUjb pupate into an adult USDA guide: bit.ly/japbeetle | NOV Treatment Pros & Cons TIPS • Traps attract beetles from • Insecticides can kill adult » Hand-picking beetles off plants 1-2 miles away, not just beetles, but must be sprayed can be effective for gardeners. | your yard. directly. Read labels to see if it » Beetles are less active early or DEC • Milky spore bacteria is hurts beneficial insects. late in the day when tempera- spread on lawns and in- • Natural predators include birds, tures cool. gested by grubs, which die. racoons and skunks. Also: par- » Crushing them is okay, dead But CSU says the treatment asitic wasps (Tiphia vernalis, beetles don’t attract live ones. | JAN inconsistent and impacts a Tiphia popilliavora), parasitic » small population. flies (Istocheta aldrichi), mi- If treating plants or turf, timing crosporidian disease (Ovavesic- is critical. Late summer is more • Beneficial nematodes are effective than spring. parasitic organisms that ula popilliae). » | Switch to xeriscaping or FEB feed on insect’s larval or • Drying out lawn (Jun-Aug) pupal stage. Pick nema- makes turf inhospitable but choose plants beetles avoid todes in the genus Heteror- grubs in a neighbor’s lawn can » Deep watering lawn once a habditis. Also need water to fly to your garden as adults. week keeps grass alive and survive and are pricey. Grubs need moisture to survive. too dry for grubs | MAR Resistant Plants Susceptible Plants How Palisade beat the Japanese beetle 1. Ageratum 1. Hollyhock 2. Columbine 2. Dahlia • Discovered infestation early | APR 3. Dusty-miller 3. Hibiscus • Community united over peaches (economic 4. Begonia. 4. Common mallow motivation) 5. Lily-of-the-valley 5. Evening-primrose • All lawns in public areas plus 712 homes 6. Coreopsis 6. Soybean treated or dried out | • Under authority of Colorado’s only horticul- MAY 7. Larkspur 7. Penn. smartweed 8. Foxglove 8. Rose ture pest-control district so property owners 9. California poppy 9. Grape could be forced to participate 10. Coral-bells 10. Sweet corn • Read the story: bit.ly/palisadeJB Illustration: Dale Taylor, Special to The Colorado Sun Reported by Credit: Whitney Cranshaw, Colorado State University; Colo. Dept. of Agriculture; USDA .
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