I'd like to hear some feedback regarding the use of nematodes to control thrips. For the past four years, I've had a devil of a time with thrips. Most of what I have tried has met with limited success:
1. Tried insecticidal soaps & neem oil -- hardly any effect.
2. Bifenthrin & imidacloprid - marginal results.
3. Spinosad -- marginal.
4. Orthene -- this works; however, I have to apply almost every five days in order to keep the scoundrels down. At that rate, I start worrying about the health of the roses. Additionally, the Orthene smells so foul.
I feel like the time to strike for this season is now; however, I'm at a loss as to what will work. Nothing angers me more than seeing a big bloom open prematurely and sickly because of a thrip.