Topic: canola

Latest on crop disease – 2017 GRDC mid-year update papers

Keep up with the latest research information on crop diseases including blackleg, sclerotinia, wheat rusts and septoria.  The following papers were presented at the GRDC Updates across Australia in July and August 2017. Click the paper titles to view the full papers.
Spray boom technology – improving coverage and managing drift
Author: […]

Blackleg Management Guide

Blackleg lesions on canola leaf

Figure 1. Blackleg leaf lesion on canola
Blackleg is a fungal disease of canola that can cause severe yield loss. It is more severe in areas of intensive canola production as fungal spores are released from the previous year’s canola stubble and spread by wind and rain splash. With good management yield loss […]

Spot the difference – identifying fungal diseases on canola

This article describes the different symptoms of canola fungal diseases blackleg, white leaf spot, downy mildew and alternaria leaf spot.
Blackleg
Blackleg, caused by the fungus Leptosphaeria maculans, is the most serious disease of canola in Australia. Blackleg lesions are grey, circular spots with black fruiting bodies (pycnidia) forming in the centre (Figures […]

White leaf spot of canola

Figure 1. Early symptoms of white leaf spot on canola leaf.

During 2017 there is an increased incidence of canola white leaf spot in many regions of southern Australia. The disease is distributed worldwide, but in Australia, it is not usually severe enough to cause yield loss. However, if environmental conditions are favourable, it can result in significant defoliation causing reduced […]

Monitor blackleg severity to ensure return on fungicide application

During 2015 and 2016 the blackleg fungus overcame the blackleg resistance of some Group A cultivars. These cultivars dropped from Moderately Resistant (MR) to Moderately Susceptible (MS) and all updated ratings are available in the 2017 Autumn Blackleg Management guide. In the lead up to the 2017 season, fungicide application […]

Latest on Canola disease – 2017 GRDC Update Papers

Keep up with the latest research information on canola diseases including blackleg and sclerotinia. The following papers were presented at the GRDC Updates across Australia in February and March 2017. Click the paper titles to view the full papers. We’ve also pulled together all the:

Cereal disease papers
Pulse disease papers

Southern Region
Canola disease […]

Understanding the cause of blackleg stem and branch cankers

In recent years, blackleg infection has affected the upper stems and branches of canola plants leading to yield loss as branches and pods on affected plants senesce prematurely causing yield loss. Steve Marcroft explains the factors researchers now believe are causing cankers on stems and branches of canola crops.
Further information
For […]

Blackleg monitoring sites 2015

By Marcroft Grains Pathology.

Our results for 2015:
Blackleg monitoring results for all 2015 canola producing regions are now available. The monitoring results PDF files below include the national summary, state summaries and individual NVT site results.

NSW Blackleg monitoring summaries 2015 (191kb PDF)
VIC Blackleg monitoring summaries 2015 (160kb PDF)
SA Blackleg monitoring summaries 2015 (179kb PDF)
WA […]

What do I need to know about blackleg branch canker?

Unusual blackleg symptoms were observed on canola stems and branches across southern Australia in 2014. Early-sown canola is more likely to be flowering and elongating during the peak blackleg infection window and suffer stem and branch cankers as a result.
Sowing time and variety resistance ratings in the Blackleg Management Guide […]