Derris dust is my traditional weapon for warding off these little leaf-munchers, but it is not deterring them at all! Ever keen to operate the organic approach in my garden - I've come up with a plan and am putting my old squash racket to good use. I swing it at the butterflies as they enter my garden with broccoli and cabbage plants in sight...
I sincerely hope my neighbours don't see me running about like a mad-person chasing after the butterflies given that I don't always succeed in my attempts to hunt them down. This method is definitely proving to be the most successful way to combat them! I definitely don't have too many issues with catepillars as the poor old butterflies don't have time to lay their eggs with me chasing behind them to squish them with my racket. However, my poor broccoli and cabbage plants in particular, look like they have been hit with bullets!
I would be interested in hearing from others regarding their techniques for keeping on top of white butterflies!
My weapon of choice for hunting white butterflies...