chow are the young of a wide smorgasbord of scarab mallet . The most destructive grubson home lawns are the larva of the Japanese beetle and the northern masked chafer , allot to the Pennsylvania State University Extension . Other coarse grubs include the European chafer , green June mallet , Asian garden mallet , May and June beetles and Oriental mallet .
Cause
A number of factor increase lawn susceptibility to grubs . This includes the buildup of thatch in lawns . Dethatch lawns on a regular basis and avert thatch buildup of over 1/2 in thick . The excessive use of chemical in lawns harm the born , beneficial worm present in the soil . This encourages the population of harmful pests like chow to increase . Overuse of chemical also sham the sizeable ontogenesis of grass , and accent lawns are more prone to pest plague and infections . Use a mulching mower to recycle grass clippings and tighten Edward Thatch buildup .
Description
Grubs are soft bodied and dirty white in colour , with six pairs of legs and browned heads . Only the green June beetle chuck lack strong leg . The size of it of the pests vary with species and age but is generally a trivial over an in long . The pests consist on their sides in a C - configuration when disturbed . Grubs have distinguishable raster patterns on their abdominal undersurface . These patterns are created with fuzz , spikelet and marginal dapple and help to tell between species . The adult of the larvae all take issue distinctly on account of sizing , Supreme Headquarters Allied Powers Europe and coloring .
Damage
The grownup beetles lay their orchis in the soil , and the hatching larvae or grubs forthwith infest and start to prey on ancestor . Early symptom admit thinning and yellow weed that finally set out to die , make brown , dead patch on lawn that keep on to get large . overrun lawn domain get soft and squishy as the food and urine - comport ability of ancestor is regard . Lawns are prostrate to drought stress , and infested grass is easily pull up . The insect set forth to draw secondary pests like armadillos , razz , moles and raccoon to the lawn that dig up the grass while looking for the grubs , causing heavy equipment casualty .
Control
Introduce natural piranha such as land beetles , ant and parasitoids like Tiphia spp . in infested smoke . parasitical wasp larvae also feed on grubs . The commercial preparation of insect parasitic nematode worm from the Steinernema and Heterorhabditis metal money are highly effective biological ascendance strategies for grubs . Non - biologic control choice include the use of chemicals like trichlorfon , imidacloprid , halofenozide or thiamethoxam .
