山西省辣椒疮痂病病原鉴定、发生规律和防效研究

Identification and Development Pattern of Bacterial Spot of Pepper and the Control Effect in Shanxi Province

在山西省南北两个辣椒产区分离到的 8支菌株 ,经鉴定为甘蓝黑腐黄单胞菌疮痂致病变种 ,均属辣椒—番茄小种 3。辣椒在 5月份定植到田间后 ,当连续两旬或连续三旬中有两旬 ,旬平均气温≥ 18 5℃、旬降雨量≥ 11 1mm时 ,田间就可出现病斑 ;自此到 7月底 ,各旬的旬降雨量决定病害的流行趋势 ,降雨量大而均衡 ,病害流行加重 ,8月份为发病高峰期 ,反之 ,病害流行较轻或受到抑制。在苗期喷 2次 15 0mg/kg的新植霉素药液 ,并在田间初发病后 ,连喷 2次2 0 0mg/kg的新植霉素药液 ,能有效地控制该病的发生流行 ,γ生防 31菌株在田间有良好的防治效果 ,是有应用价值的生防菌株。

The control and development pattern of bacterial spot of pepper were studied.The result shows that the eight isolates from pepper in Shanxi province were identified by pathogenic and bacteriological methods and differential host as XcvT race 3 of Xanthomonas campestris pv. vesicatoria (Doidge)Dye,1978.After the pepper were planted in May,within a period of ten days at every month,when the average temperature were above 18 5 ℃ and rainfall more than 11 1 mm,the spot occurred in plant.Before end of July,the prevalence of disease were depended on rainfall of a period of ten days.The more rainfall was,the higher disease severity was.The fastigium of disease was in August.Spraying twice at seedling with Xinzhimeisu at 150 mg/kg and plant twice at 200 mg/kg could get good the control effect.Antagonistic strain Shengfang 31 also showed good control effect.