9.The disease is usually caused by a bacterium, e.g. common scab of potatoes (Streptomyces scabies), or a fungus, e.g. apple scab (Venturia inaequalis).

 
  • 此种疾病通常由细菌或真菌引起,例如土豆的疮痂(由疥疮链霉菌引起),和苹果黑星病(由不等黑星菌引起)。
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