You have decided to apply nematodes to your lawn to take care of the grubs. There are many types of nematodes so make sure you purchase the right type for your lawn. Your garden center should be able to help you out. If you live in the Ottawa area the best time for application of nematodes is at the end of April and August.
These nematodes arrive on a damp sponge or mixed with clay. They are extremely sensitive to temperature and periods of drought. If you don’t have time for an application then store it in the refrigerator for up to a week The nematodes should not be frozen.
Warm the sponge or clay mix to room temperature then soak in at least one gallon of water for 30 minutes. This water has to be at room temperature, non-chlorinated and not-distilled.
Apply using a watering can or sprayer. It’s best to apply during cool, cloudy weather. It it’s really hot then apply during the early morning or late evening when the temperatures are cooler and the sun is not so bright.
The lawn or what’s left of it should be moist and recently watered. The temperature should be approximately between 12 to 30 degrees Centigrade or 55 to 99 degrees Fahrenheit. For maximum success keep your lawn moist for 3 days after application.
The results are immediate and the grubs begin to die 24 hours after being ingested.
Still confused on how to do this, here is a how to video.