I used Malathion on ornamentals with very limited success. I would never think to use it on food crops.
Really the only issue I have is a white moth who ravages broccoli, brussel sprouts, cabbage. I found a white spun poly-type fabric I use as tents rather effectively. It lets light and moisture thru. Reusable too.
Yep. Blocking the moths from getting to your Brassica is a great ‘organic’ solution! I think the product is called Remay fabric?
Do you have a long enough growing season to plant Fall crops of those same veggies? The Cabbage Moths are gone by Fall so you won’t get any damage.
I forgot to get plants started in July, so I don’t have any Fall Broccoli this season, but that little trick has always worked for me. I’m in Zone 4/5.
I went and bought some tulle on sale at a fabric store and plan on making covers for tomato cages.
I plan on using the tomato cages like with tomatoes and putting the tulle around it to keep the moths away while allowing in the maximum amount of light and air through.
I have no idea how long it will last out in the weather though. I will find out next summer.