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Beetle Grubs. Not previously mentioned on this web site are Japanese beetles, pests with which gardeners, orchardist and nurserymen are all too familiar. Japanese beetles, members of Coleoptera, devour the leaves of many popular plants, shrubs and trees.
Common hosts include bush beans, roses and flowering crab trees, for starters. White grubs are the larval (immature) stage of several different scarab beetles. In South Carolina, as well as the rest of the southeastern United States, turfgrass can be attacked by the grub stage of Japanese beetles, masked chafers, May and June beetles, and green June beetles.
From year to year, the Japanese beetle consistently causes the most damage to both turfgrass and ornamentals.
Jun 24, Adult insects are metallic blue-green and bronze, 1/2-inch beetles.
Caused by Monilinia fructicola - a fungus that is spread by wind, splashing rain, and favors warm, wet weather typically during bloom period.
Larvae are fat, white grubs with brown heads. Beetles skeletonize leaves and chew flowers. Grubs feed on the roots of grass and other plants. How to get rid of Japanese beetle adults: Shake them from plants into a jar of soapy water early in the morning, when they’re less active.
Once the egg hatches, the grubs will go through three larval stages or instars during their development.
All year, but grubs are most active during Spring. Adults feed at night; grubs spend winter in soil, burrowing deeper if cool.
POME FRUIT; PREFERS APPLES. Small grub holes on skin of fruit; fruit may drop prematurely; grubs in fruit; abundant frass seen on outside of fruit; over wintering cocoons on rough bark on trunk of tree. Grubs enter fruit later on during growing season.
Pest does not cause extensive damage to the tree as Trunk Borers do. Trunk Borers cause a thick, gummy substance (sap) leaking from round holes on the trunk or in a crotch of the tree. Grubs tunnel through trunks and prolonged injury will weaken and eventually kill the tree.