Asparagus beetle
How to control them
Also see links to identifying other allotment pests at the bottom
Allotments Available
Also see links to identifying other allotment pests at the bottom
How to fight Asparagus Beetles Excellent article by Saffyre Falkenberg.
Points 1-4 and 7-8 are worth trying.
For insecticides please only use when asparagus is not flowering as they also affect the bees that pollinate our crops and particularly the bumble bees you will see covered in bright orange asparagus pollen as they appear to love this plant!