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Agricultural News

Angela Post Says Time to Think About Weed Control

Mon, 02 Mar 2015 18:53:21 CST

Angela Post Says Time to Think About Weed Control With warmer weather on the way, the canola crop will start to come out of dormancy and so will the weeds. Oklahoma State University Weed Extension Specialist Dr. Angela Post said farmers need to start thinking about controlling those emerging weeds as temperatures warm up. In applying a herbicide treatment during the cold weather, she said herbicide applications will be slow to work, but when conditions warm up it will be good timing for post emergence control. She recommends using Roundup for Roundup Ready Canola and in conventional canola she recommends a mix of Stinger or Select or Assure II to treat grasses.

Radio Oklahoma Network Farm Director Ron Hays recently caught up with Dr. Angela Post. Click or tap on the LISTENBAR below to listen to the full interview.

Weed control in canola is easiest in the fall, especially in controlling a weed like henbit. Post said farmers won't really be able to control henbit in conventional or Roundup Ready canola, because it has over-wintered and it has had a lot of stress factors that have caused the plant to be resilient. If farmers weren't able to control their weeds in the fall, she said it will definitely hurt yields.

In scouting fields, Post is seeing all kinds of mustard weeds, such as blue mustard, tansy mustard, flixweed, pennycress and bushy wallflower. She said controlling mustard weeds in a mustard crop is very difficult. Post said most of the grassy weed species were controlled in the fall, so she is seeing a low incidence of those. Getting additional moisture events in the coming weeks will help the canola crop be more competitive with these emerging weeds.

As the wheat crop breaks dormancy, Post said she sees more grass weed species, especially in fields that have not been rotated with canola. She is seeing the usual suspects of Italian rye grass, rescuegrasses, and the different bromes, like downey brome, Japanese brome and wild oat. Post said broad leaf weeds are fairly easy to control before the wheat crop reaches boot stage. She recommends farmers start thinking about these spring weeds, as there isn't much time left for control.

When canola was first introduced into Oklahoma, one of the major attributes of the crop was to help farmers clean up weeds in their wheat fields. Post said that continues to be a great reason to rotate with canola to clean up grassy weed problems. One of the down sides of canola is the lack of crop protection products available. Currently there are only six products labeled for canola in the state of Oklahoma, so many farmers are relying mostly on Roundup Ready canola.   Post said she has concerns that this could lead to more weed resistance, so farmers need to use new modes of action as quickly as possible. She said in the future they look for products to be available to Oklahoma, so farmers can continue to grow canola as an effective weed control tool.

In looking at spring planted crops like, corn, sorghum or cotton, Post recommends farmers consider applying a pre-residual herbicide with their burn down application. If farmers have the time and the money, she recommends applying a pre-residual as it will do a better job, than a post emergence application. Post said in controlling palmer amaranth, marestail and waterhemp those weeds have a very narrow window for post emergence control.



Ron Hays interviews Angela Post of OSU
right-click to download mp3


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