With no beans in just now I had forgotten what a pest Bean Fly can be. So I had a small wander around the 'net in search of inspiration. And Linda mentioned a circumstance of which I have never heard ... Bean Fly eggs within bean seeds.
There's a few links which describe our BF but don't give much additional information. Here's a spray I found ...
'Organic Bean-Fly Spray.'
10 cloves of garlic, un-peeled and cut up rough.
2 onions (as above).
6 hot birdseye chillis, cut in half.
Boil all this for ~ 10 minutes, and let stand overnight. Strain, then add a bit of liquid soap, then store in a glass bottle or jar.
Dilute this, ~ 200ml of mixture to 9 litres of water.
Spray as soon as they germinate, then every second day until the beans are ~ 300mm high.
I'm interested to know what BLF members do to discourage Bean Fly.
One advice I read was to spray the seedlings with diluted Seaweed extract and to add compost.
In the course of my cyber-wander, I saw a photo of some rather twisted mature bean pods. That I've seen now and then and apparently it's a shortage of boron (use Borax diluted and watered on with a watering can).
I'd like to know more about the Bean Fly and about its relationship to bean seeds.
Here's some links ... http://www.daleysfruit.com.au/forum/bean-fly-control/
(the twisted pods);