Comparison on water chestnut cultivar Guiti 2's resistance to stem blight and fusarium wilt

【Object Ive】The present experiment was conducted to investigate Guiti 2's resistance to stem blight and fusarium wilt to provide scientific guidances for production of water chestnut. 【Method 】The native variety and Guiti 2were planted on three kinds of fields with different soil fertilities(high, medium and low) in water chestnut major producing areas of Guangxi viz., Pingle and Lipu countries, Hezhou's Pinggui district, respectively. Then the stem blight and fusarium wilt of water chesnut were investigated during the closure and expanding stages, and their disease indexes were calculated. 【Result 】The results showed that during the closure stage, Guiti 2 wasn 't infected with stem blight in three experimental fields compared with control disease index of 7.57-16.87. And the fusarium wilt disease index of Guiti 2 was0-7.50,that of control was 3.58-14.23. During the expanding stage, the stem blight and fusarium wilt disease indexes of Guiti 2 were 8.42-22.58 and 5.16-20.26, respectively, which were significantly lower than those of the control. In addition, the significant difference analysis showed that, there were extremely significant difference in water chestnut stem blight and fusarium wilt between Guiti 2 and the control in Pingle and Lipu countries(P0.01), and significant difference in water chestnut stem blight and fusarium wilt between Guiti 2 and the control in Hezhou 's Pinggui district(P0.05).The order of soil fertility for resistance of Guiti 2 from strong to weak was as follow: high soil fertility medium soil fertility low soil fertility. 【Conclusion 】Guiti 2 can resist to stem blight and fusarium wilt compared with native varieties,which is suited to be planted in different areas in Guangxi.