Something is chewing leaves of my bean. I looked carefuly on both sides of the leaves and find nothing except for one or two aphids in a couple of leaves. Most of leaves stay clean without any trace of pests. What else could cause such a massive damage (almost on all leaves)?
I think the pests might be Japanese beatles. We have a lot in our garden - hundreds or perhaps even thousands of beatles trapped in bags I set. However I only see a few occasionally on the leaves of the beans. Maybe they feed the leaves during the night and then be trapped by my beatle traps during day? Here is the image I find on the Internet:
It looks as though you've discovered the culprit Nan. I was trawling the net for moth larvae and aphids - never actually thought of beetles.
We do have the problem of Japanese beatles. They emerge from June to August in our area. Three years ago, Japanese beatles almost defoliate my two cherry trees, until I set out Japanese beatle traps. They work very well. I almost cannot see any beatles else where except for bunchs and bunchs in the bag of the trap. That is why I wonder how the beatles got on my hyacinth beans.
we have those here from October to march the brown flying beetle and what i do is hang camphor or mothballs in aan old panty hose around my garden as i found they were eating the new leaves on my grapes and citrus trees so mybe if you hang them around your veg garden it might help Aold lady gave me this hint many years ago
The pretty, red lily beetles are all over my lilies. Horrible things! I might try camphor and/or mothballs next year.
