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題 名 | 福壽螺為害水稻產量之損失估計 |
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作 者 | 林金樹; | 書刊名 | 臺中區農業改良場研究彙報 |
卷 期 | 11 1985.12[民74.12] |
頁 次 | 頁43-52 |
分類號 | 433.2 |
關鍵詞 | 水稻; 產量; 福壽螺; |
語 文 | 中文(Chinese) |
中文摘要 | 水稻幼株期易受福壽螺Pomacea lineata (Spix)為害,其為害時之 個體大小及密度,對水稻產量有顯著的影響。73年第二期作,以於螺後第14天 被害率最高。釋放大螺,中螺及小螺各50個處理區其被害率分別為71.2%、47.4% 及22.3%。74年第一期作,則以放螺後第24天被害率最高。釋放大螺、中螺及小螺 各50個處理區其被害率分別為19.9%、2.8%及1.8%。產量損失方面,73年第二期作, 以釋放大螺50個之處理區減產50.4%為最高,次為大螺20個處理區減產26.4%, 其餘各處理之損失與對照比較則無顯著之差異。74年第一期作,以大螺50個處理區 減產14.7%為最高,次為大螺20個及中螺50個處理區分別減產8.2%及6.7%。試驗結果 顯示,第二期作福壽螺加害水稻較第一期作嚴重,產量損失亦較大。根據產量損失 估計分析結果,建議水稻田每平方公尺發現大螺1個、中螺2個或小螺5個以上時即應 採取防除措施。 |
英文摘要 | The young seedling stage of rice plants are most susceptible to the damage of Pomacea lineata right after transplanting. The damage level depended on the size and amount of snails. The highest damage percentage was observed at 14th and 24th days after transplanting for the second crop of 1984 and the first crop of 1985, respectively. The yield losses were 71.2%, 47.4% and 22.3% respectively, when 50 large snails or same amount of middle snails or small snails were released in the second crop of 1984; while the corresponding percentages were 19.9%, 2.8% and 1.8% in the first crop of 1985. The yield reduction resulted from the damage of P. lineata were 50.4%, and 16.4% by 50 large snails and 20 large snails, respectively; while the yield loss of other treatments have no significant difference in the second crop of 1984. In the first crop of 1985, the yield reduction were respectively. 14.7%, 8.2% and 6.7% by 50 large snails, 20 large snails and 50 middle snails. In general, the yield reduction and damage level are found more serious in the second crop than in the first crop. According to the cost/benefit analysis, when one large snail or 2 middle snails or 5 small snails are found in one square meter of paddy field, respectively. Therefore, some control measures are considered to be necessary. |
本系統中英文摘要資訊取自各篇刊載內容。