With summer in full swing, lawn and garden maintenance is a top priority for many homeowners.
However, pests can be a real obstacle to the success and health of your lawn and garden. The most common group of lawn pests in Kentucky are white grubs. While it’s normal to have larvae in your lawn, too many can leave your lawn dead in late summer, so it’s important to know the signs of these pests and ways to prevent them or to control them to keep your lawn and garden in good condition. superior form.
The most common sign of white grubs is grass browning or grass that rolls easily like a carpet. Typically, the worst white grub damage occurs in late summer or early fall, so note the time of year you see these signs to see if they match the behaviors. white verse.
If you notice these signs during peak grub damage times, you can check your lawn to confirm that white grubs are the culprit. It is normal to find grubs in your lawn, however, eight or more grubs per square foot is a problem.
Identification of grubs depends on the weft pattern, arrangement of setae and hairs on the underside of the abdomen tip. To see this pattern, you will probably need to use a magnifying glass. You can easily find tables to match this model to a specific grub online.
Preventative treatments are an option for controlling larvae, but you must apply them before damage occurs. The optimal time to apply preventive treatments to your lawn or garden is from May to mid-July.
Larval preventive insecticides include neonicotinoids such as imidacloprid (Merit), clothianidin (Arena) and thiamethoxam (Meridian) or anthranilic diamides such as Acelepryn and GrubEx.
It is important to note that although Acelepryn is common for grub management, it is not a cure; you should only use it as a preventive measure.
You should only apply salvage treatments after the damage has already occurred. Once the larvae are large, you shouldn’t expect more than 75% control. There are a few products you can try like Dylox or Arena.
Source: Dr Jonathan Larson, Assistant Professor of British Extension Entomology
For more information on insect pest management and the proper use of pesticides, contact the Madison County office of the University of Kentucky Cooperative Extension Service.