In the eastern Riverina region of NSW in October 2016 lupin anthracnose was detected for the first time in commercial crops. The disease is present in WA and SA but still remains a notifiable exotic disease in NSW and Victoria. Natural hosts of lupin anthracnose are not established in NSW […]
This article describes the different symptoms of canola fungal diseases blackleg, white leaf spot, downy mildew and alternaria leaf spot.
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 […]
These diaries are intended to update chickpea growers in New South Wales and Queensland with the current Ascochyta situation in 2017. They will be updated with observations throughout the season.
30 June 2017 – Should I spray for Ascochyta before forecast 3 July rainfall?
Is a fungicide spray required before forecast rainfall […]
Growers are now able to utilise the PREDICTA® B DNA-based soil test to detect the presence of Ascochyta blight inoculum (Phoma rabiei) in their paddocks. Initial testing has shown that the Ascochyta fungus was detected in 35 per cent of samples from the Northern Region. This finding is a concern […]
Chocolate spot has been found in some early sown vetch crops in the Northern Victorian Mallee. This disease develops in warm and humid canopies. Given suitable conditions this can be a damaging disease that may warrant control with fungicides, although growers should consider the economics of applying fungicides to vetch. […]
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 […]
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 […]
Variable responses to fungicide timing to manage Yellow Leaf Spot in wheat led researchers to look more closely at how the fungus matures on stubble. Researchers are looking into how the fungus which causes Yellow Leaf Spot on wheat survives and matures on stubble, which in turn affects the onset […]
Blackspot Manager is a forecasting model for ascochyta blight (synonym: blackspot) of field peas. It can be used by agronomists and growers to help identify the best balance between early sowing and potential yield loss from ascochyta blight. Windborne ascochyta spores are released from infected stubble early in autumn, with […]
Leading into the 2017 season the risks presented by Ascochyta blight in chickpeas are at an elevated level. The occurrence of a new virulent strain of the Ascochyta blight pathogen has resulted in all resistance ratings being revised to susceptible or moderately susceptible. Throughout the Southern Region there is also […]