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CROP WATCH Sep 2017
Volume 14, Number 4
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PULSE & CANOLA DISEASES

Sclerotinia is appearing in a number of SA regions following the ongoing showery conditions. Affected crops so far include lentil, chickpeas and canola. Warm dry weather will halt the spread of the disease but rain will increase spread. Sclerotinia is able to infect all pulse crops, canola and many broadleaf weeds as well as brassica vegetables.

BGM has been reported in a few lentil crops. Ongoing rain will increase the spread of this disease. Monitor crops to determine the need for follow up fungicide sprays during spring.

ASCOCHYTA ON CHICKPEAS: Infected crops have been reported in several regions across SA including north YP, upper Mallee, lower and upper north regions. Chickpeas become increasingly susceptible as they mature and pods are very susceptible. Regular fungicide sprays are required ahead of rain events including podding sprays.

ASCOCHYTA ON LENTILS: Low levels of AB have been seen in PBA HurricaneXT lentils especially in tight rotations in north and central YP, and upper south east. Podding sprays may be required in these crops ahead of rain events.
  CEREALS OVERVIEW



Disease levels in the cereals remains very low across SA with the exception perhaps of septoria tritici blotch which has been splashing up many early sown wheat crops in the medium and higher rainfall areas of the Mid North. 
A single report of a low level of stripe rust has been received from near Bordertown. This is the latest report for a first sighting since stripe rust first arrived in Australia in 1979.
Leaf rust in wheat has remained at low levels on the eastern Eyre Peninsula and in the Mid North but can be expected to increase with the recent warmer weather where crops are not treated.
Leaf rust of barley is present on the lower Yorke Peninsula and Murray Plains but only at relatively low levels. This includes virulence on Compass.
The net blotches have been at very low levels but can be expected to increase with warmer weather. Earlier reports of partial resistance to Systiva appears not to have led to problems, possibly due to residual efficacy in the fungicide and also follow up foliar sprays with effective treatments.
Crown rot has been observed in early sown trials at Booleroo and Minnipa and is therefore likely to be significant in many crops where moisture stress has become an issue.

 
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South Australian Research and Development Institute · Plant Research Centre · Waite Campus, 2b Hartley Grove · Urrbrae, SA 5064 · Australia

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