Mach 2 is a new product which mimics the insect molting hormone, ecdysone, and causes premature molting. This product has shown consistent and excellent control for a number of white grub species. Use these materials in August through September when grubs are smaller.
Females prefer to oviposit in moist soils that are high in organic matter.
Avoiding irrigation during egg laying in July will increase mortality of eggs. However, the use of irrigation during August-September can mask larval feeding damage. The preferred timing for a majority of the recommended insecticides is in late summer to early fall when damage is first noticed. The other time period is in the spring from April to mid-May. However, it does not perform well on later instars or on older grubs.