| Paddy fields survey in 2013 amount 54 fields as follow : Mueang Chai Nat 13 fields, Manorom 6 fields, Wat Sing 5 fields, Sapphaya 7 fields, Sankhaburi 9 fields, Hankha district 10 fields, Nakhon Sawan 1 field, Uthai Thani 1 field, Sing Buri 1 field and Suphan Buri province 1 field. The first survey was begun at 15 days after planting to 90 days and weekly outbreak data sets from Department of Agricultural Extension used for decision. The survey results showed high population of brown planthopper in 2 times per year. The first time was in February to March in Mueang Chai Nat and Hankha district because of brown planthopper outbreak in Suphan Buri have migrated to Hankha district due to influence of southern wind. The second time was in July to August in... |
