成团泛菌引起的棉花烂铃病对棉花产量因子和品质的影响

成团泛菌(Pantoea agglomerans)引起的棉花烂铃病主要造成棉铃吐絮不畅,棉纤维变色,籽粒干瘪。本试验对感染该病害的不同棉花品种的发病率、绒长、单铃重、衣分以及色泽等指标进行测定,用SAS软件分析,结果显示:所有棉花品种都有烂铃病的发生,平均发病率为20.6%,不同品种间发病有明显的差别。病害对单铃重、衣分、瘪籽率、绒长及色泽的影响主要体现在单铃重平均减轻27.6%、衣分平均降低5.3%和瘪籽率平均增加1.6倍、绒长平均缩短1.6mm及平均颜色加深2.0%。由成团泛菌引起的这种细菌病害可引起棉花减产高达10%～20%。

Effects of cotton boll rot caused by Pantoea agglomerans on cotton traits and yield

The symptoms of the cotton boll rot caused by Pantoea agglomerans include hindering open bolls,discolored lint and immature or dead seeds. Incidence of the disease,factors affecting yield,and cotton traits were measured in this study. All of the data were analyzed through SAS software. The results showed that P. agglomerans could cause the disease in all of the cotton varieties tested at an average incidence rate of 20.6%,but there were still differences among the distinctive varieties. The single boll weight and lint percentage were reduced by 27.6% and 5.3%,respectively; the length of velveteen was reduced by 1.6 mm,while the immature seeds and the degree of lint discoloration were increased by 160% and 2.0%,respectively. Most importantly,the cotton boll rot disease could cause yield losses by 10%-20%.