black canker

短语

词形变化

black cankers 复数 black cankers

释义与例句

n.
  1. 1.

    Any of several plant diseases causing the formation of dark cankers.

    可数 不可数

    1927, Plant Research Institute (Canada), Annual Report of the Canadian Plant Disease Survey Scab and black canker is rapidly destroying Salix vitellina in Nova Scotia. Ten per cent of the trees surviving from previous years were killed. The damage caused by these two diseases can not be estimated separately.

  2. 2.

    The larva of the turnip sawfly (Athalia rosae), an agricultural pest having the appearance of a black caterpillar.

    可数 不可数