I need to get some BT to control cabbage worms on my cabbage, but I don't know whether I should go with the powder or the liquid form. What is your preference and why? Thanks!
I have used them both, and I prefer the liquid form. It's easier to deal with. Easier to get it on the whole plant, under leaves, etc. I use it on tomato plants also to prevent horn worms. You must mix and use right away according to instructions, and I tend to follow instructions. Any left over must be discarded once it is mixed with water. That may be a negative for some.
whichever you have the equipment to use. You need a pump up sprayer for the liquid. You could get by with a hose end sprayer, but it is not a great applicator. For the dust, you need a dust gun, Dustin Mizer or equivalent. Both forms work well when properly applied. Dust does drift and the plants need to damp when applied. spray can be applied anytime of day.
Sorry, I should have said use the liquid BT same day, not right away. I do spraying, gardening early in the day so I discard any left over and clean the sprayer as soon as I finish spraying my small vegetable garden. But you can use it up to 12 hours after mixing.
So the shaker can that BT dust comes in is not adequate for application purposes?
The shaker can I bought three years ago, Dipel I think, worked just fine for me. I have a small garden. But the BT put an end to the hornworm's nasty business on my tomatoes.
I had the shaker style cans of BT, and I thought it was hard to use and get the powder evenly distributed. So I took an old cotton crew sock, put the BT powder in and found using it helped get more even and complete coverage on the plants in our small garden.
opal52, that is a great idea. And thanks for the other posters' advice too. I bought a can of BT dust today and will apply it once it stops raining.