แบคทีเรียปฏิปักษ์จากต่างชนิดพืชอาศัยในท้องถิ่นเพื่อการควบคุมโรค ชักนำภูมิต้านทานพืช การตอบสนองต่อสูตรผลิตภัณฑ์และการพัฒนาการของข้าวโพด

Abstract

Severity of 3-diseases including bacterial leaf streak, downy mildew and Curvularia leaf spot were reduced ranging 40.4-83.0 percent evaluated at 45-day old plants that cell suspension of P38 and PCL21 showed significantly higher in disease suspension than KPS46 and copper hydroxide chemical, except SP007s (P=0.05). Regarding microbial formulation response, SP007s in talc-based formulation was the best results toward control diseases concerned and increased yield quality (2.7 percent lowest unsatisfied kernel and 17 brix sweetness) and quality (1,803.2 kg/rai). It was shown that application of indigenous antagonist with its host specificity, and formulated cells is greater effective delivery system in disease management strategies than introduced antagonist, and direct cell suspension respectively. The phenomenon of plant growth promotion and induced systemic resistance effects also correlatively elicited when theses antagonistic bacteria were applied under field experiment. Both indigenous and standard biocontrol agents equivalently promoted seed germination and increased size of 14-day old seedlings. They also led to induction of systemic resistance against 3-mentioned diseases, as a result of increase in salicylic acid and beta-1,3-glucanase activities detected at 28-day old plants (P=0.05). These data suggest that P38, PCL21, or SP007s completely reduced pesticide use and controlled the range of diseases concerned that led to improve more healthy plant and yield under conditions in which diseases and other factors influenced yield. Bacillus spp. obtained from corn showed stimulation of antagonist-disease plant specificity where SP007s from cauliflower is highly broad-spectrum of diseases suppressed.