"Sam" wrote:

Our brassicas are being shredded by thousands of caterpillars what would be
the best, preferably natural, control to use?

BT works well... it's a biological control that kills the cabbage looper
caterpillar. Harmless to humans. Dunno brand names in the U.K., but look
for "bacillus thuregensis." I use the wettable powder form, which is
really the spores of the disease that kills the worms. Coverings work
well, if they're put in before the pretty white moths lay their eggs...


Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic
Zone 5/6 in upstate New York, 1420' elevation. NY WO G