One of the worst invasions of diamond back moth / kålmøll happened a couple of days ago….here is a video showing hundredds swarming over one of my Lily White sea kale plants which is about to flower. Luckily they never do much damage to sea kale (Crambe maritima) as the harvest is over before they arrive, one of the big advantages of perennial brassica…on the other hand, annual brassica crops are being planted now in my area…they have little chance against these tiny moths….
I blame the rapeseed oil industry for this…they don’t overwinter here, but they migrate passively on warm winds from central Europe and Russia, even reaching Svalbard and Northern Norway…