We aren't able to grow asparagus in our region, but I found a great deal of good information on the problems with beetles from Cornell.
Management of Asparagus Beetles:
Clean up dead asparagus stalks over the winter. Hand pick beetles in small plantings.
For the common asparagus beetle, cutting the shoots very clean and just below ground level every day or
two during the cutting season will tend to remove the eggs before the larvae can establish themselves in a home
garden patch.
For the spotted asparagus beetle, removing and destroying asparagus berries in small garden plots, or
using only male (non-fruiting) asparagus plants, will help to give control.
If necessary, pesticides may be applied, when the beetles first appear. Apply one to three times but do
not repeat applications within 3 days. Be sure to check the label for the number of days you have to wait to
harvest (= Days to Harvest) before applying any pesticide to edible crops.
Here's the link http://entomology.cornell.edu/cals/en...
Hope this helps.
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