Jun 9, 2021
New guide helps organic growers battle burrowing rodents

Burrowing rodents can cause extensive and expensive damage to orchards and crop fields. To manage the pests without chemicals used on conventional farms, organic growers can consult a new publication from University of California Agriculture and Natural Resources scientists.

“Burrowing Rodents: Developing a Management Plan for Organic Agriculture in California” outlines management within organically acceptable methods using an integrated pest management approach.

California ground squirrels, pocket gophers and meadow voles are the three most common species that cause damage. Squirrels chew on seedlings, fruit and nuts, killing young trees and reducing crop yields. In addition to plants, ground squirrels, pocket gophers and voles can chew on irrigation lines, and their burrow systems can channel water away from plants and erode the soil. The holes and mounds created by burrowing rodents pose hazards to farmworkers and farm machinery.

This publication helps growers identify the rodent species on their properties, their life cycles and tools available to control them.

California ground squirrels chew on seedlings, fruits and nuts, killing young trees and reducing crop yields. Photo: Roger Baldwin

“Growers can read about how to effectively select and set a range of traps for burrowing rodents,” co-author Margaret Lloyd, UC Cooperative Extension small farms advisor for the Capitol Corridor, said in a news release. “Traps are an important tool for organic management, but maximizing control comes from integrating knowledge. Here we present information about rodent biology, trap efficacy, biocontrol, habitat management, plant protection and other approaches to collectively manage the pest problem.”

In the publication, Lloyd and Roger Baldwin, UC Cooperative Extension wildlife specialist in the UC Davis Department of Wildlife, Fish and Conservation Biology, review the effectiveness of commercially available traps – where to place the traps, whether to use attractants, and methods of euthanizing the animals.

They also offer cultural techniques for deterring rodents such as flooding fields and deep ripping soil to destroy burrow systems. Crops for orchard floors or cover cropping can be selected and managed to minimize habitat that protects and encourages gophers and voles.

Traps are an important tool for rodent management on organic farms, but integrating traps with other tools are necessary for effective management, according to the authors. Photo: Roger Baldwin

For biological control, they suggest barn owls, raptors and snakes might be able to assist, but warn growers that predators alone will not be able to eat enough of the rodents to reduce the high populations to tolerable levels for many growers.

“Effective management will rely on a suite of tools,” said Baldwin.

The 15-page publication is available for free download here.

Pamela Kan-Rice, University of California

Photo at top: A pocket gopher emerges from a burrow. The holes and mounds created by burrowing rodents pose hazards to farmworkers and farm machinery. Photo: Jack Kelly Clark




Current Issue

Vegetable Growers News November 2024 cover image

Grower profile: Del Jardin Fresh

Research: Cucurbit mesotunnels

GLEXPO preview: Katrina Becker unlocks farm potential by sharing weed control, cover crop insights

Hydroponics: Growing media influences plant health management

Fresh Views: Refreshing your disease management plan

Veg Connections: Soil tarping impacts on soil health and onion production

Farm Market & Agritourism: Marketing mistakes

Ag Labor Review: Elections have consequences

Editor’s letter

 

see all current issue »

Be sure to check out our other specialty agriculture brands

produceprocessingsm Organic Grower