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Milky spore grub control update#
Milky spore grub control professional#

But, recent concern on the impact that these products have on insect pollinators resulted in the passage of the Pollinator Protection Act of 2016 by the Maryland General Assembly. Imidacloprid (Merit and other numerous trade names), has been widely used for grub control since 1994.Only treat turf areas that are damaged by grubs and not the entire lawn.Insecticides that are labeled for white grub control have provided excellent control when applied properly.This product may be difficult to find on the market. Based on a number of university studies moderate control levels (70-80%) for Japanese beetle and masked chafer grubs occurred when applied to early instar grubs (July to early August). Recently a new strain of Bt was introduced for white grub control and is commercially available as GrubGONE (Bt ‘galleriae’).

This endotoxin reduces insect feeding and results in insect death.

Bacillus thuringiensis (Bt) is a bacteria-based product in which a protein endotoxin is produced within the insect gut.

These microbial based insecticides have not provided consistent levels of control in various university field trials.

Various bacterial and fungal diseases of white grubs that are present in Maryland soils have been developed as biological control agents and include milky spore disease ( Phaenobacillus), green fungus (Metarrhizium), and white fungus (Beauveria).

Milky spore grub control professional#

They are available to professional lawn care companies. This species has a longer shelf life and refrigeration is not necessary, although it is recommended to store it at temperatures of 40-60 degrees F.

Milky spore grub control update#

Update 2020 - A new species of nematodes, Steinernema scarabaei, has been showing promising results in research studies.

Applying them in late afternoon and watering them in right after application and for several days after application will improve the efficacy of these nematodes. Sunlight and desiccation can reduce their performance. These nematodes can be applied using a sprayer and diluted at 1.5 to 2 gallons of water per 1,000 square feet. The earlier they are applied to the purchase date the better the control. These nematodes have a short shelf life and need to be applied within the season they are purchased. Heterorhabditis bacteriophora nematodes have provided good white grub control.

Insect parasitoid nematodes ( entomopathogenic nematodes) are one of the better biological controls for white grubs.

Numerous factors such as rainfall, temperature, to shelf life of the biological control products affect results. Control varies and typically excellent control rarely occurs with these products.

A number of biological control products are available for use by homeowners.

When all of these factors are combined they play an important role in keeping white grub activity below damage threshold levels.

Irrigated lawns have a higher incidence of grub damage because adult beetles need moist soil for their eggs to be viable.

Weather conditions can also impact white grub survival and during drought years populations of these insects will decline.

Maryland soils contain abundant levels of microbial pathogens and entomopathogenic nematodes that will increase white grub control.

You may need to do some repair with overseeding. They eat grubs and aerate lawn naturally with their digging. Be tolerant of skunks if they are present in your area. As a homeowner, you can increase natural control by limiting any insecticide applications and promoting a diverse plant community that will attract parasitoids and predatory insects.In most cases, natural control will keep this pest under damaging threshold levels. The occurrence of white grub damage is often sporadic over a given area and over a given time period.There are a number of different control programs for reducing white grub damage in turfgrasses and using the principles of integrated pest management (IPM) is the most prudent and efficacious way to deal with preventing damage and mitigating any current damage by white grubs.