[andrewandkaren]

Hi im using Bayer Provado Ultimate Bug Killer for use on my cabbages, can you tell me how many times i can apply this or is there any other solution for white fly or butterflies, they are so annoying....

[Ice]

7mm netting will stop the butterflies.  I find Provado lasts for up to two weeks, but I don't spray if I am going to eat any veg sooner than that. 

[mumofstig]

It must say on the bottle, so you have to go by the instructions.

For cabbage white butterflies the answer is always to cover with netting (less than 7mm hole size) to stop them laying eggs, then you won't get caterpillars

snap Ice 

[Aunt Sally]

Oh... I was going to say the same 

[diggerjoe]

and ensure the plants don't touch the netting or the blighters can lay eggs