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Establishment and Application of a Specific PCR Assay for Rapid Identifying Thermoactinomyces intermedius MOLECULAR GENETIC DIVERSITY OF PATHOGENIC FUNGAL GROUP CAUSING TREE CANKER Ⅱ——28S rDNA-PCR-RFLP AND RAPD ANALYSIS OF BOTRYOSPHAERIA SPP Shapes, properties and microstructures of gadfly Investigation on virulence of Blumeria graminis f.sp.hordei population and resistance to powdery mildew of barley varieties