Studies on the Papaya Damping-off Disease
Other Title
木瓜腰折病之研究
Journal
農業研究
Journal Volume
19
Journal Issue
1
Start Page
51
End Page
56
Date Issued
1970-03-07
Date
1970-03-07
Author(s)
W.H. Tsai
蔡武雄
Abstract
Among the varieties of papaya plants to damping-off indicated that the variety of “Line 1” Solo is the most susceptible to this disease, the percentage of its infestation reached about 26.6%. Some new varieties of papaya plants introduced were Costa Rica and A4 (H. P.) which have been proven to be the most resistant to this disease. The percentage of its infestation ranged from 2.3 to 4.7% in these varieties.
Up to now, the “Solo 1” variety is widely cultivated in southern Taiwan. The damage of this variety frequently causes heavily injury under favorable conditions. The damping-off is rapidly developed in the seedling stage, particularly in raining season, because the weather frequently changes high humidity at fine days and the temperature is constantly very high. However, the disease is chiefly affected by rainy days and temperature.
The fungi were isolated from the diseased tissues of various papaya in the seedbeds and orchards, when five kinds of fungi have been found to be Fusarium spp., Rhizopus spp., Rhizoctionia sp., Phytophthora spp., and Pythium sp., among which the Fusarium spp., and the Rhizoctonia sp. are more important than other ones.
在所觀察的木瓜品種中，以蘇魯1號最易感病，其發病率達26.6％，一些引進品種以Costa Rica及A4 (H. P.) 最抗病，其發病率為2.3及4.7％。
目前蘇魯1號為臺灣南部栽培最廣的品種，但在高溫、高濕的雨季，常遭致腰折病為害。由試驗結果得知，本病與高溫，下雨日數及雨量有密切關係。
從病組織分離得的病原菌，以Fusarium spp.最多，其次為Rhizopus spp.及Rhizoctonia sp. Phytophthora spp.及Pythium sp.最少，由另一試驗得知，Rhixoctonia sp.為木瓜腰折病一種重要的病原菌。
Publisher
農業試驗所
Type
journal article
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