When to Apply Trichlorfon for Grubs?

Carbaryl and trichlorfon kill grubs at all stages of their life cycle. The pesticides may be applied in spring or fall. When applied in early fall, they generally kill between 20 and 80 percent of the grubs. If you wait until late fall to apply the pesticides, they only kill 20 to 55 percent of the grubs.

When should I apply grub killer to my lawn?

The best time to apply grub control is between early spring and late summer when there's increased grub worm activity in your lawn. For grub preventers, apply between June and July just before they hatch while for grub killers, apply the treatment from spring when you see signs of grass damage.

What month should you apply grub control?

Grub control pesticides should be applied whenever signs of an active infestation first appear, usually later in the grasses' growing season. If using a preventative treatment against grubs, aim to apply just before the grubs hatch – typically late spring or early summer.