canola Archives - Canadian Agronomist

25 Oct Canola nutrient and water use efficiencies reviewed

Posted at 20:11h in Agronomy

A research study reviewed factors affecting nitrogen, sulphur and water use efficiencies, and found that 4R stewardship of nutrients and some agronomic practices provided the greatest improvements. Economic and environmental sustainability of canola production is gaining more scrutiny in this era of emissions reductions and climate...

05 Jul Canola response to row spacings and seeding rates

Posted at 19:46h in Agronomy

Research shows that the highest plant densities and yields were produced at a narrow row spacing of 9 inches compared to those of 12, 18 and 24 inch spacings in a no-till production system. Increasing seeding rates of 2.8, 5.7 and 8.5 pounds per acre...

30 Jun Bertha armyworms feed more on canola plants with diamondback moth eggs

Posted at 17:28h in Insects

Bertha armyworm larvae caused over twice as much feeding damage on plants with diamondback moth eggs than plants without. However, bertha armyworm egg laying was not affected when canola plants had diamondback moth eggs. Diamondback moth adults migrate to the Prairies on winds from the southern...

17 May Canola cotyledon wounds contribute to blackleg disease

Posted at 17:19h in Disease

Mechanical wounds on canola cotyledons, simulating flea beetle feeding, allowed infection of the blackleg pathogen while no infection occurred on un-injured cotyledons. Wounds that were 8 hours or older before inoculation had lower levels of infection. Temperature, leaf wetness and relative humidity also played a...

12 May Integrated management of Clubroot

Posted at 16:52h in Disease

The application of hydrated lime to bring an acidic soil up to pH 7.2, and/or weed control of cruciferous weeds did not affect clubroot severity on a clubroot resistant variety. The yield of a susceptible canola variety almost doubled with the application of hydrated lime,...

04 May Precision planted canola compared to air drills

Posted at 17:10h in Agronomy

Under irrigated and high-precipitation conditions, canola yield from 12 inch narrow-row precision planted canola was 10% higher than canola seeded with a 12 inch row air drill. However, under more water-limited conditions, yield from air drill seeded canola was equal or higher than the precision...

26 Apr Clubroot yield losses assessed

Posted at 21:14h in Disease

Yield losses to clubroot disease, caused by Plasmodiophora brassicae, increased linearly as the Disease Severity Index (DSI) increased. Under greenhouse conditions, an increment of 1% in DSI resulted in a decrease of 0.9% to 1.0% in yield; under field conditions, this percentage was reduced to...

02 Dec Controlling volunteer canola in soybean

Posted at 21:23h in Weeds

Action and economic thresholds for volunteer Roundup Ready canola in Roundup Ready soybean were determined. Economic thresholds of less than 0.5 plants/ft2 (<5 plants/m2) highlight the highly competitive nature of volunteer canola in soybean crops. Volunteer glyphosate-resistant (GR) canola is a challenge for Roundup Ready soybean...

02 Nov Hydrated lime can help reduce clubroot disease

Posted at 16:47h in Disease

Research trials found that hydrated lime may be an effective tool for managing clubroot disease in canola when optimal timing and rainfall are achieved. Field and greenhouse trials found hydrated lime more effective than limestone applications, but is much more costly. Clubroot disease, caused by Plasmodiophora...

16 Sep Multiple genes improve clubroot resistance

Posted at 19:36h in Disease

Researchers investigated the efficacy and durability of canola lines carrying single and multiple clubroot resistance (CR) genes against 'new' and 'old' pathogen pathotypes. Stacked CR genes of different modes of action improved resistance and enhanced durability. Cultivar resistance is a cornerstone of clubroot management. Most canola...