Frank Henry1, Jenny Davidson2 and Paul Umina3
1Department of Economic Development, Jobs Transport and Resources (DEDJTR), 2South Australian Research & Development Institute (SARDI), 3cesar
• Substantial summer rains have increased the risk of GPA, BWYV and cereal rusts for 2015.
• Remove the “green bridge” over summer and autumn prior to sowing to reduce the risk of BWYV and its vector the green peach aphid (GPA), as well as cereal rusts.
• Use a current disease guide to check the varietal rust ratings before sowing, and take appropriate action if sowing cereal varieties susceptible to rust.
• To reduce the risk of BWYV, do not sow canola into desiccating weeds/canola volunteers as aphids will move directly from the weeds to the emerging seedlings.
• Monitor GPA populations on weeds, volunteers and seedling crops.
• For early control of GPA use seed treated with a neonicotinoid insecticide, and if farmer applied, ensure proper application and coverage of seed dressing for efficacy against GPA.
• Ensure correct identification of GPA before applying insecticides to protect seedling canola.
• Use a PreDicta B soil test before sowing to identify paddocks at risk of soil borne diseases.