Blast the blackfly

It's that time of the year again. Do not like spraying the beans with chemicals in case of what it does to the bees , let alone me.  Have found a very good remedy is to blast them off the plants with my pump up pressure sprayer.  Pump it up to the max, turn nozzle to fine jet and ZAPP !  Obviously best to do it before the varmints totally take over the plants. Also has the advantage of giving the beans  foliar irrigation. 

 They don't seem to have the ability to clamber back up the plant stems again and presumably perish where they fall. Jet does not damage the leaves at all.