Appropriate management practices, frequency and concentration of beneficial bacteria co-operation onto increasable control efficiency of economic diseases on cauliflower plant | เธ„เธงเธฒเธกเธ–เธตเนˆเนเธฅเธฐเธ„เธงเธฒเธกเน€เธ‚เน‰เธกเธ‚เน‰เธ™เธ—เธตเนˆเน€เธซเธกเธฒเธฐเธชเธกเธ‚เธญเธ‡เน€เธŠเธทเน‰เธญเนเธšเธ„เธ—เธตเน€เธฃเธตเธขเธ—เธตเนˆเธกเธตเธ›เธฃเธฐเน‚เธขเธŠเธ™เนŒเน€เธžเธทเนˆเธญเน€เธžเธดเนˆเธกเธ›เธฃเธฐเธชเธดเธ—เธ˜เธดเธ เธฒเธžเธเธฒเธฃเธ„เธงเธšเธ„เธธเธกเน‚เธฃเธ„เธชเธณเธ„เธฑเธเธ‚เธญเธ‡เธเธฐเธซเธฅเนˆเธณเธ”เธญเธ

Experiment was conducted for potential evaluation of effective biocontrol and application methods of bacterial antagonist, Pseudomonas fluorescens SP007s and Bacillus sp. SP009s isolated from cauliflower rhizophere for control important diseases of cauliflower soft rot, black rot, and alternaria leaf spot. In laboratory experiment, the different efficacy in each concentration of benefit bacteria to enhance seed germination rate and growth promotion of cauliflower was observed. The result revealed that the cauliflower seeds treated with fresh culture suspension of SP007s and SP009s at 0.1 and 0.15 OD were significantly highest potential to enhanced seed germination rate and seedling vigor. Treated seeds with SP007s could be stimulated rate of seed germination at 100 percent and enhanced seedling growth with root length and stem high at 2.92 and 5.34 cm respectively. While the seed treated with SP009s exhibited seed germination rate at 100 percent and stimulated root length and stem high at 3.63 and 5.34 cm respectively. These results indicate the effective of seed treatment alone with antagonistic bacteria SP007s at 0.1 OD concentrations was the highest potential against cauliflower soft rot disease with 75.26 percent disease reducing follow by seed treated with OD 0.2 and 0.25 cell concentration that could be reduced disease severity at 74.63 and 74.47 percent respectively. In field experiment, the suitable conditions of concentration and frequency for antagonistic bacterial application were investigated. The result revealed that the combination treatment of cauliflower seed treated with SP009s at 1.5 OD plus 4 times foliar spray bolstered with SP007s at OD 0.1 at 14, 28, 32, and 46 days after planting was the highest potential to growth promotion and reduced severity of cauliflower diseases, soft rot, black rot, and alternaria leaf spot at 80.26, 82.08, and 86.01 percent disease reduction respectively and increased marketable yield of cauliflower by 1.97 ton/rai.