Posted: 06/02/2014 at 19:05
Jess forget the soil thermometer. You need to wait several weeks yet. Nematodes will simply die now ..besides nobody will supply yet.
Imcreasingly I'm in the minority here but Provado vine weevil killer will work now. It will kill those grubs regardless of soil temp or season.
For me treatment with Provado to save your plants now is worth it. Then you can revert to nematodes in late spring. Then a cycle of spring and autumn nematodes every year. Works for me.