BTi (mosquito dunks) and beneficial nematodes

[Bobo Bolinsky]

I have pretty serious fungus gnat problem, and am going atm with crumbled dunks and sticky traps. Have read + and- with efficacy of dunks. Did use Scan Mask (nematodes) long ago worked fine. I think rather than guess if the dunks will work, I'll get some nematodes. So any knowledge of how Bti might be harmful to the nematodes?

 

[Granger2]

Pretty sure it won't harm them, but check with your supplier. Email/call Buglogical. Good luck. -granger

 

[OrgrO]

Bio Works Inc NemaShield uses beneficial nematode Steinernema feltiae. Their MemaShield compatibility chart shows their nematodes are compatible with Bacillus Thuringiensis Israelensis.

 

[BOMBAYCAT]

I have had to use dunks a few times and they seem to work well. They are not instant but after a couple weeks, no more gnats. I crumble a little on top and also by the drain holes of the flower pot. They are a nuisance so good luck.

 

[brown_thumb]

I've been adding Mosquito Bits in the top inch (25mm) of my soil because it's easier than crumbling the dunks... they're already crumbled. I also use Microbe-Lift liquid at the rate of 1ml/gallon (1ml/4l). That's 2-4x the recommended amount but a gallon (4l) of this stuff lasts a long time.

 

[moses wellfleet]

I have pretty serious fungus gnat problem, and am going atm with crumbled dunks and sticky traps. Have read + and- with efficacy of dunks. Did use Scan Mask (nematodes) long ago worked fine. I think rather than guess if the dunks will work, I'll get some nematodes. So any knowledge of how Bti might be harmful to the nematodes?

I saw no visible result from either BTi or beauvaria bassiana. Steinerama feltiae nematodes were amazing an hour after application a huge number of fungus gnat larvae came up the soil surface to die. Deadly effective. Nematodes are not harmed by BTi. Good luck!