Pest identification
What's eating my jersey knight asparagus?
Common asparagus beetle (Crioceris asparagi)
Signs: Dark larvae and adults defoliate fern fronds, weakening crowns and reducing next year's harvest.
Control: Hand-pick daily through the fern season; apply spinosad or neem oil; till beds in autumn to expose overwintering adults.
Cutworms (Agrotis spp.)
Signs: Spears severed at or just below soil level overnight; characteristic clean-cut stem with no visible insect.
Control: Place cardboard or foil collars around emerging spears; apply beneficial nematodes (Steinernema carpocapsae) before emergence.
Slugs and snails
Signs: Slime-trailed holes bored into spear tips, especially in cool, wet springs.
Control: Iron phosphate pellets scattered around the bed edge; hand-collect at night; keep bed free of dense mulch during emergence.
Deer
Signs: Spears and fern fronds browsed to stubs; especially damaging to young beds that cannot afford loss of fern energy.
Control: Install tall deer fencing (8 ft) or use individual wire cages; motion-activated sprinklers in high-pressure gardens.
Keep jersey knight asparagus pest-free
Healthy plants resist pests best. Get the basics right:
Jersey Knight Asparagus pests — FAQ
What is eating my jersey knight asparagus?
Jersey Knight faces the same pest spectrum as all garden asparagus: asparagus beetles strip ferns and scar spears, slugs hollow emerging tips, and cutworms sever spears underground. Deer and rabbits target tender new growth. Daily hand-picking of asparagus beetles is the most effective single action each season.
How do I get rid of common asparagus beetle (crioceris asparagi) on jersey knight asparagus?
Dark larvae and adults defoliate fern fronds, weakening crowns and reducing next year's harvest. Hand-pick daily through the fern season; apply spinosad or neem oil; till beds in autumn to expose overwintering adults.
How do I get rid of cutworms (agrotis spp.) on jersey knight asparagus?
Spears severed at or just below soil level overnight; characteristic clean-cut stem with no visible insect. Place cardboard or foil collars around emerging spears; apply beneficial nematodes (Steinernema carpocapsae) before emergence.
How do I get rid of slugs and snails on jersey knight asparagus?
Slime-trailed holes bored into spear tips, especially in cool, wet springs. Iron phosphate pellets scattered around the bed edge; hand-collect at night; keep bed free of dense mulch during emergence.
How do I get rid of deer on jersey knight asparagus?
Spears and fern fronds browsed to stubs; especially damaging to young beds that cannot afford loss of fern energy. Install tall deer fencing (8 ft) or use individual wire cages; motion-activated sprinklers in high-pressure gardens.