Biological control of Capsicum bacterial wilt by compound bacterial mixture AR99
GE Hong-Han, GUO Jian-hua, QI Hong-ying, GUO Ya-hui, HUANG Yan-xia (Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China; Department of Biology, Zhoukou Normal University, Zhoukou 466001, China; Huaian Modern Horticulture Technology Centre, Jiangsu Province, Huaian 223003, China; Food Department, Handan Agricultural College, Hebei Province, Handan 057150, China)
Five bacterial strains with complementary biocontrol activities were selected and mixed as one biocontrol agent AR99 for the control of Capsicum bacterial wilt. In the greenhouse test,the biocontrol efficiencies of the mixture and individual bacterium suspension R1, A9, J3, R9 and A6 strains were 91. 1%, 88. 9%, 80. 5%, 80. 5%, 66. 7% and 57. 0%, respectively, with that of the mixture AR99 being the highest. Field plot tests for the biocontrol of Capsicum bacterial wilt were done by composting method and root-drenching method in Huaian, Jiangsu in 2000 and 2001. The average disease control effieciencies of AR99 were 94. 0% and 77. 0%, with the average yield increasing efficiencies of 367. 0% and 57. 8%, respectively, by the composting method and root-drenching method 70 days after treatment.