Aphids on cabbages
I have some white aphids/grubs clustered on the leaves of some cauliflowers/cabbages under your thick protective netting. Would the Savona fatty acid do the trick?
The Savona Fatty Acid should do the trick as long as you get good contact with the pests, it only works on contact, try to spray on the top and underside of the leaves. You may also need more than one spray, I suggest every 7 days until the problem is resolved. I hope this helps.