Grubs in the soil come in contact with the spores through ingestion. When this commercially available bacterium is used, it infects the grubs and produces a disease.
No matter which product or approach is selected, be sure to read and follow label directions.Ī biological treatment method, useful against only Japanese beetle grubs, is the application of milky spore bacteria. If you find an average of five or more grubs per square foot, a curative pesticide application is justified.Ĭurative treatments applied in late summer or early fall are more effective than spring applications because the grubs are smaller and easier to control. Repeat this process in several locations. Examine the soil and roots in the top 3 or 4 inches. To scout for potential grub issues, wait until August and use a heavy-duty knife or a spade to cut a 1-square-foot flap of sod and roll it back. If you don’t know if you have a grub problem, then it is best to verify that grubs are actually present before applying pesticides. Merit® and Mach 2® are two preventative pesticides that can be applied. If there is a history of grub problems in your lawn, preventative treatments can be applied in mid July. Larvae pupate, and adults emerge in May and early June to begin the cycle over again. The grubs return to the root zone and begin feeding in March. In November, the grubs burrow deeper into the soil to over winter. These larvae feed on grass roots until cool weather arrives in October. The timing can vary a few weeks among the different species, but eggs are laid in early July and the larvae hatch out two weeks later. White grubs have a one-year life cycle and spend about 10 months of that cycle in the ground. All white grubs have a very distinct curled, or C-shaped, position. Mature grubs vary in length from 1⁄4 to 1 1⁄2 inches, depending on the species. Regardless of the species of white grub, they all have cream colored bodies with yellow to brownish heads and six legs. However, a relatively new pest, the oriental beetle may become a problem in the future.
Japanese beetles are the most damaging grubs we see in Caldwell County. There are over 30,000 species in the scarab beetle family. Please note that some applications and/or services may not function as expected when translated. NC State Extension does not guarantee the accuracy of the translated text. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning.
#When to apply milky spore free
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