Weevil and White Grub
Pictured above: Typical Weevil damage on Rhodo plants
We offer different types of Weevil Control, such as the Weevilution and Cold Shots as listed in the beneficial nematodes page. However, we do have more options for tackling weevils. The life cycle of the black vine weevil is that eggs are laid in the summer, and hatch out into larvae starting in mid-August. Early to mid-September is the best time to attack them as the larvae are still small and easier to kill with nematodes, and, if you apply nematodes within that window, the soil temperatures will be ideal for the nematodes to be active.
For weevils, you have 2 choices and application windows:
Steinernema kraussei (S.k, Cold Shots) are applied early in the year, and can be purchased in retail packs as listed in our nematode page as well as bulk sizes for larger operations. The application window is typically in April, when soil temperatures exceed 5C.
The second species is Heterorhabditis bacteriophora (H.b, Weevilution), which can be applied in early May when soil temperatures exceed 10-12C.
New weevils begin to hatch mid August, so we recommend applications of H.b from early September to ~the third week of Sept. to get a handle on the second wave of larvae. This application can be follow up with S.k in October once soil temperature fall below 10-12C.
White grub/chafer info: coming soon