2017 ASHS Annual Conference
Analysis of Control Efficacy of Different Fungicides Against Downy Mildew of Onion in South Korea
Analysis of Control Efficacy of Different Fungicides Against Downy Mildew of Onion in South Korea
Friday, September 22, 2017
Kona Ballroom (Hilton Waikoloa Village)
During the nursery seedlings stage at Muan, South Korea on 2013, moisture and temperature conditions were favorable for the occurrence of onion downy mildew. Therefore, the different fungicides was evaluated for their efficacy in controlling onion downy mildew under nursery seedlings conditions. It showed sufficient to evaluate the efficacy of different fungicides for the control of onion downy mildew since disease incidence of the untreated control was 51.1%. Occurrence of onion downy mildew was reached by 4.4% at treated plot with Mancozeb (MAN plot), a protectant fungicide, resulting in the highest control value with 91.4%. Incidence of the disease was 10% in MIX plot treated with various fungicides like Amectotradin plus Dimethomorph, Fluopicolide plus Propamocarb HCL, or Dimethomorph plus Pyraclostrobin, showing 80.4% of control value. Among the various fungicides, Amectotradin plus Dimethomorph fungicide (AME plus DIM plot) was selected and treated three times to nursery seedlings, it resulted in 12.2% disease incidence and 76.1% of control value. There was statistically significant difference between three different fungicides plots and untreated control for disease incidence. These results suggest that the application of fungicides on onion nursery seedlings was effective to control the onion downy mildew.
This study was financially supported by the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries, the Advanced Production Technology Development Program, Ministry for Agriculture, Food and Rural Affairs, Republic of Korea.