I just read:
Cabbages and beans
There is anecdotal evidence that where
cabbages are grown with unrelated
plants like runner beans, there’s a
reduced incidence of cabbage aphid
and cabbage root fly. It’s thought these
insects will land on a selection of
plants to make sure there is a sufficient
density of cabbages to support their
offspring. The theory is that, after
landing on one or two cabbages, they
will get discouraged and fly away if the
second or third plant they land on is a
bean, or some other non-cabbage.
Cabbages and beans
There is anecdotal evidence that where
cabbages are grown with unrelated
plants like runner beans, there’s a
reduced incidence of cabbage aphid
and cabbage root fly. It’s thought these
insects will land on a selection of
plants to make sure there is a sufficient
density of cabbages to support their
offspring. The theory is that, after
landing on one or two cabbages, they
will get discouraged and fly away if the
second or third plant they land on is a
bean, or some other non-cabbage.
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