Effect of soybean variety, straw Mulch and PGPR application to bacterial pustule disease and the abundance of rizhosphere bacteria

Abstract

Bacterial pustule caused by Xanthomonas axonopodis pv. glycines is one of important bacterial diseases of soybean in Indonesia. The development of alternative control of the disease is required to support Integrated Pests and Diseases Management for sustainable agriculture. This research was conducted to observe the effect of straw mulch, Plant Growth Promoting Rhizobacteria (PGPR) on the incidence of bacterial pustule disease and the abundance of chitinolytic bacteria, heat tolerant bacteria, and fluorescence bacteria on two soybean varieties. All of the factors as combinations were not significant to affect the value of total area under disease progress curve (AUDPC) of bacterial pustule. Factor that significantly affected the values of AUDPC was varieties. Gepak Kuning variety has lowest AUDPC value compare to Anjasmoro variety. In addition, combination of Gepak Kuning variety and straw mulch showed AUDPC value. Abundance of fluorescence bacteria on soybean rhizosphere treated with PGPR is significantly higher compared with those on plants without PGPR. The other treatments and their combination did not significantly affect the abundance of rhizosphere bacteria.