Table 1: Potential for injury to ryegrass and clover cover crop interseeded in corn.
Herbicide | Annual ryegrass | Clover |
Converge XT | Safe | injured |
Callisto | Some injury - some stand reduction | injured ** |
Engarde | Some injury - some stand reduction | injured ** |
Integrity - Set up rate | Safe | Not injured |
Integrity - full rate | Injury - stand reduction | Some injury |
Primextra | Injury - stand reduction | Some injury |
Lumax | Injury - stand reduction ** | injured ** |
Treflan/Prowl | Injury - some stand reduction * | Some injury |
Focus | Injury - stand reduction ** | Slightly injured |
Frontier Marksman | Injury - some stand reduction * | Some injury |
(*) Indicates severity of damage, more * = more damage
Source: Dr. Darren Robinson, University of Guelph, Ridgetown Campus, project funded under GF2
Some growers have interseeded cereal rye at 60 lbs/ac into corn as the crop begins to mature or even after harvest. They have achieved enough growth late fall and early spring to provide some benefit.
Cover Crops Following Cereals and Late Summer Harvested Crops
"Cover Crops Following Cereals and Late Summer Harvested Crops" has more information on cover crop options in this time frame.
Cover Crop Options in Soybeans
When winter wheat as a crop is not an option after soybeans, consider seeding a winter cereal as a cover crop. The most common option is rye, but any winter cereal will do such as wheat, barley or triticale. Broadcast 60 lbs/ac at 10% leaf drop, or drill it in immediately following harvest.
Source: OMAFRA