Examining Non-chemical Methods of Alfalfa Weevil Management Across the Intermountain West

Examining Non-chemical Methods of Alfalfa Weevil Management Across the Intermountain West
Author: Judith S. Herreid
Publisher:
Total Pages: 0
Release: 2023
Genre: Alfalfa
ISBN:

Alfalfa weevil (Hypera postica Gyllenhal) is a pest of alfalfa (Medicago sativa L.). Insecticides are the primary method of weevil control but with increasing insecticide resistance, alternative non-chemical methods are critical for future management. Multiple studies were conducted to explore two alternative methods: early harvest and biological control. Early harvest is a mechanical method of control where recommendations are vague and previous work is insufficient for improving recommendations. One study based in Wyoming and one spanning multiple states in the Intermountain West was conducted to 1) evaluate how early harvest compares to insecticides and 2) impacts both alfalfa weevil populations and their natural enemies. Biocontrol is another promising alternative method of alfalfa weevil control. Bathyplectes curculionis (Thomson) is an imported European parasitoid that is commonly collected in the Intermountain West but does not adequately manage weevils. It remains largely unknown why B. curculionis is not more successful, but they are documented to host both native and introduced hyperparasitoids. Hyperparasitoids potentially impact B. curculionis survivorship, but this remains largely understudied. Through sampling efforts across the Intermountain West, we quantified hyperparasitoid parasitism in the region within alfalfa-alfalfa weevil systems and explored the interaction between B. curculionis and hyperparasitoids. Through our efforts, we determined early harvest is an effective method of weevil control comparable to insecticide use. Multiple hyperparasitoid species were found consistently across the region but their impact on B. curculionis biocontrol remains unclear. This combined early harvest and biocontrol work will support IPM recommendations to growers and increase alfalfa production sustainability.

Management of Insecticide Resistance in Alfalfa Weevil for the Intermountain West

Management of Insecticide Resistance in Alfalfa Weevil for the Intermountain West
Author: Jeremiah Vardiman
Publisher:
Total Pages: 0
Release: 2022
Genre: Alfalfa
ISBN:

Resistance to pyrethroid insecticides has been identified in alfalfa weevil populations in Montana and Wyoming, with suspected insecticide resistance situations in Utah. The best strategy for delaying and combating resistance is integrated pest management, which relies on a solid pest monitoring program.

Management of Insceticide Resistance in Alfalfa Weevil

Management of Insceticide Resistance in Alfalfa Weevil
Author: University of Wyoming. Extension
Publisher:
Total Pages: 0
Release: 2022
Genre: Agricultural pests
ISBN:

Resistance to pyrethroid insecticides has been identified in alfalfa weevil populations in Montana and Wyoming, with suspected insecticide resistance situations in Utah. ... The best strategy for delaying "and combating resistance is intergrated pest management, which relies on a solid pest monitoring program." -- cover

The Alfalfa Weevil and Methods of Controlling it

The Alfalfa Weevil and Methods of Controlling it
Author:
Publisher:
Total Pages: 18
Release: 1916
Genre: Alfalfa
ISBN:

The alfalfa weevil destroys a great deal of alfalfa in northern Utah and southern Idaho. It also inhabit southwestern Wyoming and is spreading slowly to new territory in all directions. I may in time infest most of the United States. The adult, a small brown snout-beetle, and th larva, a green wormlike creature, usually escape notice during the first two or three years that they are present in a locality, but as soon as they begin to become numerous enough to do harm they are readily found, and their effect upon the appearance of the fields is conspicuous. Vigorous treatment is then necessary to prevent partial or total destruction of the first and second crops. The purpose of this bulletin is to show how serious the attack is to the farmer, how much territory it embraces and how it spreads, a nd to describe the insect, its work, and the methods which are effective in dealing with it.

Intermountain Alfalfa Management

Intermountain Alfalfa Management
Author: Steve B. Orloff
Publisher: UCANR Publications
Total Pages: 152
Release: 1997-06-01
Genre: Technology & Engineering
ISBN: 9781879906242

This comprehensive guide for western alfalfa growers brings together the most current information and recommendations in nearly all areas of alfalfa management, including stand establishment, fertilization, irrigation, pest management, and harvesting

Managing the Alfalfa Weevil

Managing the Alfalfa Weevil
Author: Steve Danielson
Publisher:
Total Pages: 8
Release: 1994
Genre: Alfalfa
ISBN:

The identification and life cycle of the alfalfa weevil are discussed along with scouting techniques, economic thresholds, and other integrated pest management tactics.