Grubs are a root-feeding headache for the turf pro. Short curative treatments used to be our only weapon against these destructive pests, but new preventative products have given us more tools to help in the battle. To understand today's products we must first look at the biology of grubs.
Their most visible damage can be seen in the late summer months when the turf is most stressed. Severe infestations may see numbers of up to 50 grubs per square foot.
1. The turf rolls back like carpet. This is because there are no roots left to anchor the turf. For this reason, there is no way for the turf to extract water. The turf will yellow and die quickly.
2. Digging holes may appear over night. This is from skunks, raccoons, armadillos, moles, birds and other varmints. They all love the taste of the juicy little guys.
There are over 60 varieties of white grubs in Texas. The Phyllophaga Crinita is the dominant species in Texas turfgrasses.
Insecticides such as organophospates or carbamates have been the most common treatment of the past. Their weakness is that they only last 2 to 3 weeks and that gives you a very narrow window for effective control of the grubs. You must time your application accurately or you still stand a chance of a grub infestation and possible turf loss.
If you see damage, use a curative insecticide. If there is no visible damage then use a preventative program.