WA growers are urged to adopt four key management practices to manage stripe rust risk in 2003
GroundCover™ Issue: 44
- Avoid very susceptible varieties (see list, left) which will promote regional outbreaks with heavy losses. Among varieties on hand, preferably sow those that are moderately susceptible or intermediate in resistance or better.
Plan for suitable varietal options going into 2004. Barley, oats, pulses and oilseeds are not affected by wheat stripe rust. Durum wheat is resistant.
- Kill autumn volunteer cereals that form the green bridge for rusts and so reduce risk of early severe stripe rust.
Areas most affected by stripe rust in 2002 were those where autumn wheat volunteers had developed.
- Use fungicide at seeding (seed dressings or applied in-furrow with fertiliser) to delay disease onset, particularly when relying on very susceptible varieties or in areas of recognised risk of early infection (green bridge areas or south coast and adjoining districts).
- Fungicide-spray all susceptible varieties at the first sign of the disease. Monitor crops regularly from early stem elongation (target earliest and most susceptible crops first) to recognise the disease at early stages of infection.
Crop monitoring with timely fungicide spray will avoid high disease pressures in very susceptible varieties.
Continue monitoring 3-4 weeks after treatment to determine the necessity to re-spray.