White Lawn Grub |
Late summer and into early fall is the time white grub problems are most likely to show in lawns in the northern states.
Even though a comparatively small percentage of lawns will in reality experience lawn grub damage, these insects can rapidly cause devastating damage to your lawn.
Lawn Grubs - How Do You Know If You Have Them?
These grubs, additionally known as white grubs, feed on the turf root structure, causing wilting and browning in large, irregular-shaped areas. In late summer, there can be numerous reasons you can have turf brown spots, so don't automatically conclude that your turf suffers from lawn grubs. A sure-fire way to find out if you have a grub problem is to inspect the root zone for the classic "C-Shaped" grubs.
Here is how you do it: Cut the turf back in the affected area at the margins where the brown areas meet the healthy, unaffected turf areas. A lawn grub count of more than 10 to 12 grubs per square foot will lead to the wilting and browning of your turf.
Keep in mind other factors that can lead to poor turf rooting and are commonly mistaken for grub infested areas. One classic area that can be mistaken for lawn grubs is shady areas, as the roots are typically shallow rooted, and can be lifted very easily. Shady turf areas are normally not affected by lawn grubs. Also, many lawns were easily pulled up in the early spring and grubs were blamed. Turf roots will rot away once the grass above dies and the sod can easily be lifted up.
So keep in mind that assessing grub damage in the spring from the previous season is very difficult, even if you find dead areas of turf.
Another way to determine if you have lawn grubs is if you have skunks or raccoons digging your turf up overnight looking for grubs, which is a food source for them. While moles are commonly attracted to your turf in search of grubs, it is not a positive indication.
Why is it that not all lawns in a particular neighborhood are not affected equally?
The reason for this is the adult stage of the grub is the Japanese Beetle, which flies. So if they fly to your lawn and not your neighbor's, it is by means of random chance. But adult beetles normally lay eggs in full-sun lawn areas with adequate soil moisture.
Most often the Japanese beetle lays their eggs in July. So if it has been dry, and you have watered your turf you are surrounded by dry turf, the beetle will likely select your lawn.
If Your Turf Looks Like This, You May Have Grub Damage |
There are many factors that affect the chances of having grubs in your turf. One very clear indication is if you observe a lot of beetles on your turf during the month of July.
Also if around sundown or shortly after sundown, you see active tan beetles, these are adult white grubs called Masked Chafers.
The Japanese beetle usually feeds on ornamental plants during the daytime hours.
Make sure you keep an eye on your turf from about mid-August through the month of September.
Watch for browning and wilting turf areas, and be sure you inspect the affected turf root zone for grubs.
How Can Grub Damage Be Prevented?
You have several options to consider. One extreme option is to stop your lawn irrigation during the month of July so it will go dormant. This will deter the beetles from laying their eggs in your turf. This of course has a downside of a brown lawn in the middle of summer.
A better option is examine the use of a lawn grub control substance. If there has been known problems in your lawn or your neighbors turf, you ought to make use of a natural grub control substance.
What Is The Most Beneficial Way To Get Rid Of Lawn Grubs?
The most beneficial method for lawn grub infestations is to use an organic bacterial application. Although the poisons available will certainly do the job and kill your grubs, you risk pollution of the water table and killing song birds.
Also you risk the introduction of unhealthy circumstances to your pets and family. One of the best treatments is Milky Spore and can control lawn grubs for up to 10 years if applied correctly.
Click to learn more about Milky Spore.
How Can You Repair Your Lawn After Damage?
If there has been significant damage to your lawn, you should implement some lawn restoration strategies.
First of all, be sure to rake up all the dead debris.
Next, be sure to water the damaged areas very thoroughly as some of the damaged roots may recover and this is particularly effective in cooler weather.
Areas that don't recover, bare areas, or severely thin turf areas should be reseeded. The best time to start your restoration is when the heat of summer has past.
This is generally around Labor Day for many parts of the country.