
台南區農業改良場田間調查發現雲嘉南地區水稻進入生育中後期,部分田區瘤野螟蟲口密度偏高,已出現捲葉和葉片受害情形,呼籲農友加強巡查,於發現每平方公尺超過1隻成蛾後7天內適時施藥防治,同時注意飛蝨類害蟲變化,強調使用核准登記藥劑並輪用不同作用機制以降低抗藥性風險。
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雲嘉南地區水稻進入生育中後期,瘤野螟為水稻重要害蟲,幼蟲吐絲將稻葉縱向捲起取食葉肉組織,造成白色條狀食痕,嚴重影響光合作用和穀實。
田間發現瘤野螟蛹。(台南農改場提供)
雲嘉南地區水稻陸續進入生育中後期,台南區農業改良場田間調查發現,部分田區瘤野螟的蟲口密度偏高,已有捲葉以及葉片等受害情形,呼籲加強防治,避免影響收成。
南改場表示,瘤野螟俗稱縱捲葉蟲,為水稻重要害蟲之一,其幼蟲吐絲將稻葉縱向捲起,藏匿其中取食葉肉組織,讓葉片呈現白色條狀食痕,嚴重時造成葉片枯白,會影響水稻光合作用,以及稻穀充實。
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近期部分田區瘤野螟蟲口密度偏高,南改場提醒農友要加強田間巡查,由於幼蟲捲葉後藏匿其中,增加藥劑防治難度,建議於田間發現每平方公尺超過1隻成蛾後,掌握後續幼蟲孵化時機,於7天內適時施藥防治。
另外,目前田間飛蝨類害蟲密度雖然尚低,但隨著水稻進入生育中後期,仍應留意後續族群變化;南區改場提醒農友加強田間巡查,特別注意稻株基部飛蝨類害蟲發生情形,若蟲口密度達防治標準,應適時採取防治措施。
南改場強調,使用農藥時,務必選用核准登記的藥劑,並確實遵守推薦稀釋倍數,以及安全採收期等規定,建議輪用不同作用機制藥劑,以降低害蟲產生抗藥性之風險。
遭受瘤野螟幼蟲危害的水稻。(台南農改場提供)

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