White chow are the larva of beetle , most often those of the Japanese beetle that unremarkably infest zoysia grass , a best-loved turf sens in warmer climates of the U.S. Nipponese beetle lay their ballock in July ; by late July the eggs hachure and go forth white grub feed on the roots of zoysia sens for two month . Several insect powder have lately been taken off the market , but there are several handling to suppress or kill the grubs . These are normally put on in early August ; preventive insect powder are applied earlier .
Biological Treatments
The two main biological treatments for lily-white eats are bacteria ; these are used by constitutional gardeners and others interested about possible adverse effects of chemic pesticides .
Bacillus thringensis is a bacteria that occurs naturally in the grunge and on the dark surface of plants and is come up in the guts of caterpillars of sure butterflies and moths . It is commonly call Bt and is sold on the Internet and at many garden supply centers . pedagogy for using Bt are on the commercial label .
The USDA develop milky spore , a grease - dwelling bacterium ( Paenibacillus popilliae , formerly B popilliae ) to toss off Nipponese beetle in the 1930s . White grubs die in one to three weeks after exhaust milky spore ; each dead chow releases jillion of unexampled spores as it break down . Ten Ezra Pound per acre are apply in a grid . whitish spore will all excrete clean eats in two to three long time in warm climates and three to five years in cold climate . Once found , milklike spore will control white grubs for 15 to 20 years .
Nematode Treatment
Nematodes , another option for the constituent gardener , are microscopic round worms that use up white grubs . Nematodes labeled for ascendence of whitened grubs may be bought in garden supplying centers in parcel that may contain up to 50 million nematodes . Nematodes will buy the farm if the temperature is not at least 60 degree F. They are applied by a sprayer at the end of a hosiery . The zoysia smoke want to be thoroughly soaked to get the nematodes to the grubs .
Preventive Chemical Treatment
Horticulturalists at the University of Connecticut recommend preventive diligence of pesticides containing the active ingredients clothianidin , halofenozide or imidacloprid before the beetle eggs hatch , roughly from June 15 to July 15 , the earlier the good .
Curative Chemical Treatment
University of Connecticut researchers commend cure white eats from zoysia sess with an insecticide containing the participating ingredient trichlorfon . The weed should be water heavily before software to drive the grubs to the surface . After software , the lawn should be watered heavy once more to deport the toxin to the grubs .
