Asparagus Beetle Infestation in a Garden

Asparagus beetle (via Wikimedia Commons, CC BY-SA 3.0)

Asparagus beetle infestations in a garden are a common problem for asparagus growers. The asparagus beetle is a small, oval-shaped insect that feeds on the shoots, leaves, and stems of asparagus plants. Infestations can lead to reduced growth and yields, as well as unsightly damage to the plants.


  • Yellow or brown discoloration on asparagus fronds
  • Fronds that appear shriveled, curled, or distorted
  • Holes or missing chunks on shoots and stems
  • Yellow or brown spots on leaves
  • Black or brown excrement on leaves or stems
  • Presence of asparagus beetles or their eggs on the plants

What is an Asparagus Beetle


  • Oval-shaped body
  • Approximately 1/4 inch in length
  • Black head and thorax
  • Rusty-red wing covers
  • Six black spots on wing covers


  • Pale yellow and plump
  • Approximately 1/2 inch in length
  • C-shaped grubs
  • Found feeding on asparagus fronds and stems.


  • Small and oval
  • Light yellow or yellow-orange in color
  • Usually found on the upper surface of asparagus leaves and stems
  • Clumped together in groups of 10 to 20 eggs
  • Typically hatch into larvae within a week of being laid.

Treating an Asparagus Beetle Infestation

Hand picking

  • Inspect plants regularly and remove adult beetles, eggs, and larvae by hand
  • Drop them into a bucket of soapy water to kill them

Insecticide application

  • Apply insecticides such as carbaryl, permethrin, or spinosad to kill adult beetles and larvae
  • Follow label instructions and use protective equipment
  • Monitor plants after application to ensure effectiveness

Crop management

  • Clean up and destroy any asparagus debris after harvest to reduce overwintering sites for beetles
  • Plant asparagus in well-drained soil with good air circulation to discourage infestations

Natural predators

  • Encourage populations of natural predators such as lady beetles, lacewings, and parasitic wasps to help control asparagus beetle populations
  • Avoid using insecticides that may harm natural predators