ประสิทธิภาพของเชื้อรา Trichoderma harzianum ต่อการลดปริมาณเชื้อรา Aspergillus spp. ในแปลงปลูกข้าวโพดโดยชีววิธี

Abstract

Trichoderma harzianum strain CB-Pin-01 suppressed the growth and effectively destroyed mycelia of Aspergillus sp. When T. harzianum strain CB-Pin-01 used as seed and soil treatment or as seed and soil treatment plus three spray applications, the populations of Aspergillus spp. in corn planting soil were reduced by 85.26 and 90.00 percent, respectively, whereas the reduction of population in a control was 13.95 percent. T. harzianum strain CB-Pin-01 could colonize corn roots and rhizosphere soil throughout the growing period. High populations of T. harzianum were detected at 15 days after planting (3.8-5.4*10**(3) CFU/g), and then gradually decreased to 1.3-1.5 *10**(3) CFU/g at 15 days The populations of Aspergillus spp. detected on maize kernels at pre- and postharvest in all Trichoderma treatments were potentially lower, but not significantly different when compared with Aspergillus spp. populations in the non treated control.