Field Crop News

Herbicide Injury in Corn and Soybean, FarmSmart Expo 2012

Mike Cowbrough July 13, 2012 6146 Comments Off

Corn

Below are examples of corn and soybean injury demonstrated at the FarmSmart field expo, July 12, Elora Research Station (University of Guelph) Scenario 1: Just this past spring, I had contact with a producer who had accidentally applied Guardian Plus (glyphosate + chlorimuron + flumioxazin) post emergent to his glyphosate tolerant soybeans. This mistake is understandable as Guardian (glyphosate +…

Soybean Cyst Nematode and Rhizoctonia Root Rot in Soybeans

Albert Tenuta July 11, 2012 6624 Comments Off

Diseases

I have had a lot of questions concerning Soybean cyst nematode and rhizoctonia in soybeans recently. In terms of SCN, remember the primary SCN symptom is often no above ground symptoms at all. Growers are advised over the next few weeks to scout for SCN by carefully digging-up plants, gently remove the soil from the roots and examine them for…

Impact of Dry Conditions on Soybeans

Albert Tenuta July 11, 2012 2432 Comments Off

Diseases

Horst Bohner, Soybean Specialist, OMAFRA, Stratford Albert Tenuta, Field Crop Plant Pathologsit, OMAFRA, Ridgetown Prolonged dry conditions can reduce soybean yield at any stage of development, but plants are more susceptible during germination and the reproductive growth stages. Dry soil conditions during germination will reduce plant stands. Severe moisture stress is evident by leaf wilting and under extreme conditions may…

Soybean response to late herbicide applications

Mike Cowbrough June 8, 2012 3822 Comments Off

Soybean

How late can you apply post emergent soybean herbicides without causing significant injury and yield reductions? Most herbicide labels specify a maximum crop stage (Table 1). A three year study by Dr. Peter Sikkema reveals that of all the herbicides tested, Pursuit (imazethapyr) and Pinnacle SG (thifensulfuron) should not be applied at advanced crop stages (between the 5th trifoliate stage…

Pre-plant dandelion control in soybeans

Mike Cowbrough May 10, 2012 3243 Comments Off

Soybean

The majority of growers, crop consultants and researchers will tell you that it is always better to manage dandelions in the fall then in the spring. Fall management simply is more effective. The photo below clearly illustrates this point. The outside rounds of this field were managed last fall and there is an obvious difference in the level of dandelions…

IP Soys Checklist!

Horst Bohner January 18, 2012 1726 Comments Off

Soybean

Markets continue to move towards quality assurance through IP production whether for IP soybeans or other crops. There is no standard contract for IP or non-GMO production. Each contract reflects the requirements of the end user. Premiums vary with level of management, cost or production risk. Just as “no one shoe fits all”, producing for any one market may or…

Septoria Brown Spot in Soybean

Albert Tenuta January 16, 2012 2721 Comments Off

Diseases

Septoria Brown Spot in Soybeans Septoria Brown spot is caused by the fungal pathogen Septoria glyines and under normal conditions, the disease does not cause major yield loss in Canada. Were yield losses have occurred in the past is when the soybean plants are under prolonged stress conditions. This can result in premature defoliation which begins with the lower leaves…

Comparing Herbicide Programs in Identity Preserved (IP) Soybean

Mike Cowbrough October 4, 2011 2620 Comments Off

Soybean

Co-Authors: Dr. Peter Sikkema, Dr. Clarence Swanton & Dr. François Tardif (University of Guelph) Field studies at Elora and Woodstock have evaluated soybean herbicide treatments based on their weed control efficacy and the yield protection they provided. Important differences were found among those treatments (Table 1). Table 1. Average visual control of broadleaf and grassy weeds and soybean yield (bu/ac)…

Stem Canker in Soybean

Albert Tenuta July 29, 2011 1504 Comments Off

Diseases

The conditions this year have resulted in a number of soybean diseases starting early and northern stem canker is one such disease. In most years, stem canker symptoms become apparent later in the seasonafter flowering. This year stem canker started earlier with seedling damping off and early season wilting symptoms which is as stated above a response to the growing…

Herbicide Injury Scenarios in Soybeans and Edible Beans 2011

Mike Cowbrough July 8, 2011 16494 Comments Off

Edible Beans

Here is a summary of herbicide injury scenarios in soybeans (glyphosate tolerant), white beans, kidney beans and adzuki beans showcased at the South West Crop Diagnostic Days in Ridgetown on July 6th and 7th, 2011. Scenario 1: Sandea (halosulfuron) is currently not registered in Ontario. Above is a post-emergent application of the 70 g ai/ha rate of Sandea, which represents…

Herbicide Injury Explanations – Valtera (flumioxazin) in Soybeans

Mike Cowbrough June 29, 2011 4064 Comments Off

Soybean

Above average precipitation in the spring of 2011 has illustrated for many, areas within their fields that are slower to drain and even prone to have standing water (see below). Certain herbicides are at greater risk of causing crop injury in areas where there is standing water. The reasons are two fold. First, the plants are stressed and their ability…

Checklist for High Yielding Soybeans

Horst Bohner June 1, 2011 2414 Comments Off

Soybean

The Ontario Soybean Growers began a soybean yield competition in 2008. The results were impressive! The winner yielded 72.1 bu/ac near Seaforth. These yields are good examples that with the right weather, soil type, and management, large yields are possible in Ontario. With the big yields and excellent prices in 2008, some producers grossed over $1,000 per acre in their…

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