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OSU Extension

College of Food, Agricultural, and Environmental Sciences

CFAES

Georgetown - Annual RYe/Crimson Clover Cover Crop

Plant Date: 05/17/21

Cover Crop: Annual ryegrass & crimson clover

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Report Date: 06/17/21

Growing Degree Day since planting: 462

Growing Degree Day since 01/01/21: 926

Growth Stage: V3 (1st planting), V2 (replant)

Description: Plants are beginning to show nutrient defeciency symptoms. Some of this can be related to the extednded period of wet soil conditions. The annual rye can also be a culprit as it will utilize much of the available nitrogen in the soil. The nitrogen defeicency symptoms inlcuded yellowing and necrosis of lower leaves. The leaf purpling may be sypmtoms of phosphorous defeciencies. Finally, the interveinal chlorosis and yellowing of lowers leaves could also be signs of sulfur defeciency. There are also spots that appear to be early symptoms of a disease (possibly eye spot or early gray leaf spot). James is working on correct identifcation. Updates will be posted here. 

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Report Date: 06/04/21

Growing Degree Day since planting: 268

Growing Degree Day since 01/01/21: 732

Growth Stage: V2

Description: Replant was comleted on 06/03/21. We will continue to monitor vole damage. Cover has deteriorated more since the original planting. 

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Report Date: 05/27/21

Planting Strategy: Plant into green cover and terminate after planting. 

Growing Degree Day since planting: 203

Growing Degree Day since 01/01/21: 667

Growth Stage: VE 

Description: 

  • Pest: Extensive damge from Voles. Intended plant population was 35,000. Non-damage areas have 28,000 - 30,000 population. Several large areas damaged by voles have 10,000 - 15,000 population. Varies greatly across field. More will be posted on action taken in coming days. Some cover crops can serve as an ideal habitat for voles. Voles dig up and eat seed for up to 21-28 days after planting. No folair damage. Burrows were also found (see images below). This is a concerning issues for dense stands of some cover crops. Other fields planted at the same time in a thin barley cover are not yet showing vole damage. Some cultural practices can be put into place prior to and during planting. For example, a mix that includes species that will winter kill will reduce habitat and allow for more predator access. Light tillage can also be used to disrupt nests. Since this field has already been planted, completely killing or removing the cover may be necessary before replanting to avoid further damage. Find more infomration about scouting and control at https://www.hoormansoilhealth.com/news-resources-voles.html

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