In order to study the general law on meiosis of Periplaneta Brunnea. Air-dried method was used to observe the chromosome of spermatogonium in different stages.
探讨褐斑大蠊减数分裂规律，运用空气干燥法对褐斑大蠊精原细胞第一次减数分裂染色体形态进行观察。
2
Disease resistance of the seedlings of 59 introduced Populus nigra clones seedlings infected with Marssonina brunnea and Alternaria tenuis were investigated by applying statistical analysis.