旱田病圃稻熱病的發生與氣象
Other Title
Occurrence of Rice Blast and Meteorological Conditions in an Upland Nursery
Journal
中華農業研究
Journal Volume
26
Journal Issue
4
Start Page
290
End Page
296
Date Issued
1977-12-03
Date
1977-12-03
Author(s)
蔡武雄
Wu-Hsiung Tsai
Abstract
在旱田病圃臺南五號稻熱病的發生不受每月平均溫度變化的影響，從四月到十月均可發病，但嘉農秈八號的發病受每月平均溫度變化的影響，在高溫時期的六月到十月中旬病斑數越多，此期間病斑數也較臺南五號多。利用Kramar-Collins胞子採集器採集胞子時，一般從下午八時到翌日早晨八時胞子數最多，但空氣中胞子數亦受下雨的影響而減少，細雨不影響胞子採集教。下雨日數多，病斑數亦多。嘉農秈八號R, M及S型的病斑數比例受溫度的影響，在高溫時R型的比例較少，但溫度較低時R型的比例增多。
In an upland rice blast nursery, blast on Tainan 5 was not affected by the monthly temperature fluctuation. This disease occurred on Tainan 5 from April to October. But blast on Chia-nung-shen 8 was influenced obviously by the monthly temperature changes. This disease occurred on Chia-nung-shen 8 with much more lesions at the highly temperature month, from June to the middle of October. During this period, the lesions on Chia-nung-shen 8 were abundant than that of Tainan 5. Conidia were trapped with a Kramar-collins spore sampler. A diurnal change of releasing conidia with greater numbers was from 8 pm to 8 am. But the number of conidia could be diminished by a heavy rain. However, a drizzle was favored for conidia released.
Disease incidence of blast also influenced by the number of rainy days. The more rainy days, the more lesions obtained.
The ratio of the number of R, M and S lesions were affected by temperature. At the pericd with high temperature , the ratio of R lesion as lower than that of lower temperature period.
Publisher
農業試驗所
Type
journal article
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