黃瓜雜交育種試驗初步結果

(一)緒言黄瓜是我國主要蔬菜作物之一。在黄瓜的生產中,霜霉病(Peronoplasmopara cu-bensis)是一個嚴重的問題,全國各地都有發生,成為黃瓜減產的一個重要因子。此病在瓜秧7-8片葉子或採瓜初期開始發生,傅染很快,病情的發展也很快,往往使整個植株在短期内全部枯死,因而造成嚴重減產。由於病情發展很快,所以菜農叫它"跑馬乾";但北京所稱的"跑馬乾"不只指霜霉病一種,也包括黄瓜的一切葉片枯萎現象。不同的黄瓜品種對此病的抵抗力有所不同:最易感染的是北京刺瓜,抗病力較強的是鞭瓜和截頭瓜,但也仍然每年都要發生或輕或重的病害。目前防治此病的辦法,一般是噴射波爾多液或銅皂液,但並不能得到滿意的效果;此外由於黃瓜容易發生藥害,倘配製藥液

PRELIMINARY REPORT ON BREEDING EXPERIMENTS WITH THE CUCUMBER(Cucumis sativus L.)

Cucumber(Cucumis sativus L.), one of the important vegetable crops of China, is affected seriously by downy mildew (Peronoplasmopara cubensis) in every part of the, country where this crop is grown. Although different commercial varieties differ in their susceptibility to this disease, yet none has been proved to be satisfactory to the growers. Repeated sprays of Bordeaux mixture or copper-soap solution may give partial control but they frequently cause spray injury. The experiments herein reported were car...