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Common Asparagus Beetle Management During Harvest Season

Ethan Grundberg, Vegetable Specialist
Eastern New York Commercial Horticulture

May 9, 2018

The beginning stages of Common asparagus beetle (Crioceris asparagiI) infestations often go unnoticed. Since the beetles have two to three generations per year (depending upon where you are in our region), the population can build quickly over the course of a couple of years and catch growers off-guard at harvest. 

Overwintered adults emerge from their pupae about the same time that asparagus spears begin to push. They quickly begin to feed on the tender shoots causing a sort of rasping damage that browns quickly in the field or post-harvest. The beetles then mate and deposit their eggs in vertical lines along the spears as shown in the image. After about a week, those eggs hatch into small grubs that continue to feed on spears before pupating in the soil. 

Though the larvae, not adults, are most susceptible to insecticides, growers experiencing significant early damage (the economic threshold is suggested to be when 5%-10% of spears have adults present) may need to use an insecticide to knock down the adults before targeting larvae and later generations on ferns. Given the need to continue harvesting every 1-2 days (a practice that also helps remove eggs from the field to slow the population growth), a short Pre-Harvest Interval (PHI) and Restricted Entry Interval (REI) are key to selecting an appropriate labeled insecticide. 

The standard insecticide options are pyrethroids (IRAC Group 3A), such as Pounce 25 WP and other labeled permethrin formulations (1 day PHI, 12 hour REI) or PyGanic 5.0 (OMRI, 0 day PHI, 12 hour REI). Some neonicitnoids (IRAC Group 4A), such as Assail 70 WP and Anarchy 30 SG (both acetamiprid), are also labeled for asparagus beetle adults and larvae during harvest (1 day PHI, 12 hour REI). Lannate (methomyl, IRAC Group 1A), is also options if you are willing to equip the harvest crew with early entry PPE (1 day PHI, 48 hour REI) to continue removing egg masses on cut spears. An easier option for those looking to use an organophosphate is Sevin XLR Plus (carbaryl, 1 day PHI, 12 hour REI). Note that Lorsban (chlorpyrifos) is sometimes recommended in other states, but IS NOT allowed for use on asparagus in New York. 

For heavily infested fields, continue scouting the asparagus after harvest and target second and/or third generations with any of the options listed above or with IRAC Group 5 spinosyns, such as Radiant or Entrust (OMRI), both of which have a 60 day PHI. Cleaning fields of old stalks after mowing in the fall can also help reduce the overwintering populations.  

Image 11. Common asparagus beetle adults feeding on an emerging spear
Image 22. Grayish colored asparagus beetle eggs visible in a vertical line on a young spear




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October 21, 2025 : Cover Crop Field Meeting
Willsboro, NY

Thinking about upping your farm's cover cropping game? New technology for seeding and crop tracking, research-driven recommendations for high tunnel cover cropping, cold tolerant varieties for North Country climates, and farmer expertise will be shared at this field event.

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The first-ever New York State Agritourism Conference, hosted by the CCE Agritourism Program Work Team, is designed to support farms in growing successful visitor experiences. This statewide gathering will feature expert-led sessions, peer networking, and practical tools to help farms expand direct sales, education, hospitality, and entertainment offerings.

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ASL 104sp Seleccion y organizacion del personal (Staffing and Organizing Your Team) taught in Spanish

November 12, 2025 : ASL 104sp Selección y organización del personal (Staffing and Organizing Your Team) in Spanish

ASL104-SP: Selección y organización del personal (Staffing and Organizing Your Team - impartido en español) ¡Inscripciones abiertas!

En este curso identificamos cómo escribir descripciones de puestos disponibles en el trabajo para atraer a los mejores candidatos. Aprenderá a encontrar empleados con un perfil deseado, cómo entrevistar y seleccionar a las personas adecuadas. Descubrirá cómo completar la documentación de nuevos empleados, la autorización de empleo y la contratación de personal (on-boarding): es decir, cómo efectivamente incorporar nuevos empleados al rancho en una manera exitosa y productiva.

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