Dr Kurt Lindbeck, plant pathologist at the NSW Department of Primary Industries, says small, raised black fruiting structures within a lesion on a lupin plant or lupin stubbles are symptomatic of the disease phomopsis.
PHOTO: Nicole Baxter
A pulse disease specialist is encouraging mixed farmers who are planning to graze animals on lupin stubbles to check the stubble carefully for signs of phomopsis to avoid the onset of lupinosis.
New South Wales Department of Primary Industries plant pathologist Dr Kurt Lindbeck says phomopsis of lupin is normally associated with lupin stubbles and summer rainfall: “The disease can also develop on green lupin plants, however, this is rare,” he says. “Stresses such as drought, herbicide injury or frost may trigger the growth of the phomopsis pathogen in green plants and the production of toxins, which can affect livestock.”
Dr Lindbeck says samples of albus lupin were received at the Wagga Wagga Agricultural Institute in late October 2015 with symptoms of phomopsis stem blight. He says the symptoms were on the main stem and looked similar to what would normally be associated with sclerotinia: large, oval-shaped and bleached lesions.
The difference, however, was that there were small, raised, black fruiting structures within the lesions, characteristic of what appears on lupin stubble following summer rain and typical of phomopsis. In addition, the suspect plants had lodged (collapsed) at the point of the lesion.
Dr Lindbeck encourages growers who suspect that phomopsis may have infected their lupin stubbles to have the symptoms confirmed by their local agronomist.
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