Novel control of lettuce downy mildew and anthracnose docx

Novel control of lettuce downy mildew and anthracnose Belinda Rawnsley Lee Bartlett and Barbara Hall South Australian Research and Development Institute (SARDI) Waite Research Precinct Adelaide, South Australia belinda.rawnsley@sa.gov.au Downy mildew of lettuce • Bremia lactucae • Obligate pathogen • Routine fungicide use • Resistant varieties • Yield loss and poor marketability [...]... Angela Lush & Ian Bogish (SARDI) • Seed companies • Growers for providing diseased plants • Project team from DPIVic and University of Queensland Posters # 65 Nitrogen affects lettuce susceptibility to downy mildew (Bremia lactucae) # 66 Anthracnose disease on lettuce affected by variety and nitrogen .. .Anthracnose severity 100 90 mean disease severity (% leaf area affected) 80 70 60 50 40 30 20 10 0 Cabrio Kocide Folical Ecocarb Aminogro Trichoderma Agri 50 Acadian Serenade Water Pre-inoculation application Almost all treatments100% disease incidence Anthracnose AgriFos Sentinel 2010 Field trials – downy mildew • 2 varieties cv Marksman and Barcelona • Planted Aug –... 40 f ef def cde cde Ecocarb Aminogro bcd a abc 30 20 10 0 Rezist Kocide Folical19 Treatment Phostrol Trichoderma Microplus Water Conclusion • Variable control by alternatives • Downy - alternatives:  Rezist (plant growth)  Folical 19® (Calcium) • Anthracnose - limited products  AgriFos®, Cabrio®, Kocide® best • Commercially unacceptable disease levels Acknowledgements • Funding provided by the Vegetable... Field trials – downy mildew • 2 varieties cv Marksman and Barcelona • Planted Aug – harvested 9 weeks later • 8 products tested • Six sprays ( 7-14 days) Field trials – never go as planned (Sclerotinia and no anthracnose) Field trials Assessed 4 fully mature leaves disease rating scale 1-6 Severity cv Marksman 100 Mean severity (% leaf area affected) 90 80 70 a 60 50 bc 40 de 30 cd Kocide Aminogro Trichoderma . Novel control of lettuce downy mildew and anthracnose Belinda Rawnsley Lee Bartlett and Barbara Hall South Australian Research and Development Institute (SARDI) Waite. DPIVic and University of Queensland Posters # 65 Nitrogen affects lettuce susceptibility to downy mildew (Bremia lactucae) # 66 Anthracnose disease on lettuce affected by variety and nitrogen . alt="" Aim • Evaluate different products (inc. biologicals, soft options and plant growth) to control downy mildew and anthracnose on lettuce to reduce reliance on chemical fungicides  safer