|Meng, Q - Michigan State University|
|Douches, D - Michigan State University|
|Hao, J - Michigan State University|
Submitted to: Biological Control
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/11/2013
Publication Date: 12/2/2013
Citation: Meng, Q.X., Hanson, L.E., Douches, D.D., Hao, J.J. 2013. Managing scab diseases of potato and radish caused by Streptomyces spp. using Bacillus amyloliquefaciens BAC03 and other biomaterials. Biological Control. 67(3):373-379.
Interpretive Summary: Biologially based materials were tested for control of common scab of radish and/or potato in greenhouse trials. In greenhouse or growth chamber tests, a strain of Bacillus amyloliquefaciens (BAC03), ground chestnut tissue, ground horseradish, and essential oils of organo and clove reduced disease severity. Based on efficacy, four of these were tested in the field for common scab control on potato. The B. amyloliquefaciens strain consistently reduced scab severity at two field locations in two years of testing. In one of those years, treated potatoes also showed an increased yield. The other treatments showed signifcant disease reductions in some of the locations in at least one of the years, but were less effective than the B. amyloliquefaciens and efficacy varied in the different locations and years.
Technical Abstract: Streptomyces spp. cause scab disease in plants like potato and radish. To seek effective control methods of this disease, biologically based materials were examined on their efficacies for disease control. In greenhouse or growth chamber tests, potting soil was infested with Streptomyces scabies (106 CFU/cm3), followed by applying five products. Bacillus amyloliquefaciens strain BAC03 (105 CFU/cm3) reduced disease severity and enhanced growth of radish; chestnut tissues, oregano and clove essential oil (0.1 µg/cm3), and ground horseradish (> 0.18 g/m3) significantly reduced the severity of common scab in potato and/or radish. In fields at the Michigan State University Farm (MSU) and Montcalm Research Center (MRC) in Michigan in 2011 and 2012, chestnut tissues (1.15 kg/m2), oregano essential oil (0.44 L/m2, 0.35% v/v), and ground horseradish (0.38 g/m2) were incorporated into the soil two weeks before planting. BAC03 (106 CFU/ml, 1 L/ m2) was drenched into the root zone soil four times at 2-week intervals from one month after planting. BAC03 significantly (P<0.05) reduced disease. It also enhanced potato tuber weight in 2011. The rest of the treatments had significant disease reduction, but were less effective compared to BAC03, and varied depending on location and year.