Hi, I have an asparagus bed, 1m x 4m, 7years old. I appear to have an infestation of asparagus beetle. til now I haven't noticed them or controlled them, so they have built up without me noticing. I can pick off about 50 adults twice a day, which is time consuming. Is it worth picking them off ? If I'm diligent will I get my infestation under control, so will merely need monitoring in following years ?
I'm considering moving them to a new bed in the autumn anyway so they have more room, so I could wash the roots before replanting in new soil. The old soil (where the adults emerge from I could skim off and put in a lidded compost bin for a year to try and break the cycle. I guess I need to know what depth the beetles stay at in the soil.
Any thoughts ?