Field Crop Diseases

Lupin growers to keep an eye out for Lupin anthracnose

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 […]

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 […]

The Northern Chickpea Ascochyta Diaries

Chickpea Ascochyta - kevin moore

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 […]

Preliminary PREDICTA® B results show prevalence of Ascochyta inoculum

Figure 1 Ascochyta blight (Phoma rabiei) population density in PREDICTA® B and NVT sites in 2017

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 in Vetch – Northern Victorian Mallee

Figure 2. Botrytis spp. causing Chocolate spot in vetch.

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. […]

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 […]

Blackspot Manager for field peas

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 […]