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在本世纪前半叶,栗疫病菌(Endothia parasitica 寄生内座壳菌)毁坏了美国栗(Castanea dentata)树林,这种危害遍及美国栗的自然分布区。防治林木病害的一般方法对本病均已无效。本文研究的一种方法是应用病毒状细胞质低毒剂来减弱栗疫病菌的致病力。由于用含有这些低毒剂的菌株处理,溃疡逐一被控制,但无论是低毒剂,还是含有低毒剂的菌株,似乎都不自然传播。或许需要持续的含有低毒剂的溃疡为传播提供长期的种源。
In the first half of this century, the Cryptosporidium citrinopilensis (Endothia parasitica parasites) destroyed the Castanea dentata woods, a danger that spreads throughout the natural distribution of American chestnuts. The general method of controlling forest diseases has been invalid for this disease. One of the methods studied in this paper is to reduce the virulence of Cryphonecopharyngodacarpus by using virulent cytoplasmic low toxicants. Since the ulcers were controlled one by one with the strains containing these low toxins, neither the low toxin nor the low toxic agent seemed to be naturally transmitted. It may be necessary for persistent ulcers containing low-toxic agents to provide long-term germplasm for transmission.