荷塘蕪菁根黑粉病的初步研究

一、前言广东新会县荷塘一带盛产蕪菁[根用蔬菜,俗称冲菜,Brassicajuncea(Linn.)Coss.],远銷国內和海外各地。蕪菁除受肿根病(PlasmodiophorabrassicaeWorn.)、軟腐病Erwiniacarotovora(Jones)Burg.]和花叶病[Brassicavirus2(Turnipvirusl),HogganandJohnson]严重为害外,尚受