Japanese Beetle. Popillia japonica
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1 Japanese Beetle Popillia japonica
2 Japanese beetle adults chew on leaves and flowers of many plants Japanese beetle damages plants in two distinct ways
3 White grubs prune the roots, producing drought stress symptoms
4 Flowers are often a favored plant part targeted by adult Japanese beetles
5 Overlap of adult feeding on flowers and use of those flowers by pollinators Issue of unusual concern with Japanese beetle
6 Uber-host Plants Favored by Japanese Beetle Adults in CO Roses** Littleleaf Linden* Virginia Creeper* Silver lace** Damage to Virginia creeper Damage to linden
7 Other Plants Commonly Grown in CO that are Highly Favored by Japanese Beetle Ornamentals Hollyhock* Gaura** Rose-of-Sharon** Crabapple Japanese maple Peking cotoneaster Food Crops Beans (green, edamame) Basil Raspberry* Grape * JB populations overlap with flowering ** JB populations overlap >alot< with flowering
8 Japanese beetle traps are excellent for detecting presence of the insect in an area
9 9
10 Proposed Project for 2019 Repeat/Expand the 2008 Japanese beetle survey to establish the present situation in eastern Colorado 10
11 Should we now consider trying to introduce natural enemies of Japanese beetle into Colorado? Yes!
12 Natural Enemies of Japanese Beetle Exist Elsewhere in the US Paenibacillus popilliae (Milky spore) Bacterium Istocheta aldrichi* Tachinid fly Tiphia species* Parasitic wasps Ovavesicula popilliae* Microsporidium (fungus) * Species involved in Colorado Japanese Beetle Biological Control Program
13 Natural Enemies of Japanese Beetle for Potential Introduction into Colorado? Ovavesicula popilliae a microsporidian disease of Japanese beetle larvae Ovavesicula infection of Malphighian tubules of Japanese beetle larva Main observed effects from infection reduced fecundity, reduced winter survival
14 The Malpighian tubules of insects filter wastes from the blood, functioning somewhat like what the kidney does in humans
15 Heavy O. popilliae infection of Malpighian tubules of Japanese beetle Normal Infecte d
16 Infected malpighian tubule packed with O. popilliae sporophorous vesicles
17 Grub Mortality (%) Year 6: Impact of Ovavesicula Infection on Winter Grub Mortality (Oct.'05 to April '06) Ovavesicula Infection (%)
18 Ovavesicula popilliae: % infection of adult Japanese beetles at ten golf courses in Michigan from 2000 to 2016.
19 Japanese beetle trap catches at ten golf courses in southern Michigan from 1999 to Data are mean beetles/trap/week. Source: David Smitley, Michigan State University
20 Experimental releases of Ovavesicula popilliae were first made in 2015 Japanese beetles collected from Michigan that were infected with Ovavesicula popilliae were shipped to us in late July The beetles were frozen, so no live beetles were introduced, but spores of the pathogen are still viable.
21 Inserted whole into soil The infected (but dead and frozen) beetles were applied in several ways Blended and applied as slurry Broadcast whole on surface
22 Positive infections confirmed in 2017 from both Flatirons Golf Course (Boulder) and Pueblo Zoo release sites!!!! 2015 releases of Ovavesicula popilliae It took!
23 Japanese beetle biological control sites in the Denver Metro area Ovavesicula popilliae was released at six sites during August
24 History of JB Biological Control Releases in Pueblo Ovavesicula released in 2018 Ovavesicula released in 2015 Infection confirmed in 2017 Istocheta released 2018 Ovavesicula released in 2015 No infection confirmed to date
25 History of JB biological control releases in Boulder Ovavesicula release 2015 Infection confirmed 2017
26 Istocheta aldrichi the winsome fly Diptera: Tachinidae The adult flies glue their eggs onto adult Japanese beetles
27 Hatched egg Pupa of the fly larva that developed within and killed the Japanese beetle
28 Japanese beetle biological control sites in the Denver Metro area Istocheta aldrichi was released at two sites during July
29 History of JB Biological Control Releases in Pueblo Istocheta released July 2018
30 Tiphia vernalis spring tiphia Hymenoptera: Tiphiidae The adult wasps dig into the soil and lay their eggs on late stage Japanese beetle grubs Photographs courtesy of David Shetlar, the Ohio State University
31 Japanese beetle biological control sites in the Denver Metro area Tiphia vernalis was released at the Sterne Park site (Littleton) in May
32 At almost all JB biocontrol release sites traps were maintained to try and establish a 2018 baseline population estimate, against which future comparisons can be made
33 Proposed Japanese Beetle Biological Control Plan Attempt to establish all 3 JB biocontrols at strategically located sites where the insect is in high population ( ?) Denver/Arapahoe County Metro Area 8-12 sites Boulder (3-4 sites) Pueblo (3-4 sites) Other (TBD) Monitor establishment and spread of the released biological control organisms ( ?) Periodically census JB by trapping to detect changes in populations ( ?
34 Proposed Japanese Beetle Biological Control Plan Attempt to establish all 3 JB biocontrols at strategically located sites where the insect is in high population ( ?) Denver/Arapahoe County Metro Area 8-12 sites Boulder (3-4 sites) Pueblo (3-4 sites) Other (TBD) Monitor establishment and spread of the released biological control organisms ( ?) Periodically census JB by trapping to detect changes in populations ( ?
35 Proposed Japanese Beetle Biological Control Plan Attempt to establish all 3 JB biocontrols at strategically located sites where the insect is in high population ( ?) Denver/Arapahoe County Metro Area 8-12 sites Boulder (3-4 sites) Pueblo (3-4 sites) Other (TBD) Monitor establishment and spread of the released biological control organisms ( ?) Periodically census JB by trapping to detect changes in populations ( ?
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Japanese Beetle Popillia japonica Stages Present in Soil Adult Graphic courtesy of David Shetlar, The Ohio State University Japanese beetle damages plants in two distinct ways Japanese beetle adults chew
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