with reference to James Atkins, I have the same problem and it is caused by bumblebees drilling into the back of the flower robbing the nectar rather than going into the front. Has any one got any ideas of how to combat this? Do the bees need proper training?
This will be my first year growing broad beans. Just in case the pod-forming problem is bumblebees, I'm going to try netting the plants with netting holes wide enough for other bees to enter and escape, but too small for bumblebees...
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