• 沒有找到結果。

害蟲的發生密度是受蟲源密度、寄主的合適度以及環境的舒適度 的綜合影響,其中有任何一個環節不能配合,則其發生密度就將受到 限制。目前推行的害蟲綜合防治的概念即由此發展出來,即使用各種 可能抑制害蟲的方法融合成為一個體系,將害蟲族群抑制於可能造成 經濟危害損失之下。在此體系中,於環境因素相同的情況下,寄主作 物對害蟲的抗或感性就成為影響害蟲發生程度的主要因素。由於栽植 抗蟲品種並不增加任何費用於生產者,同時對人、畜及環境不具危險 性,更可配合其他任何防治方法使用而獲得相乘的防治效力。在生態 環境品質日益受重視,倡導農業永續經營的今日,抗蟲品種的開發與 利用更顯重要。

然而以抗蟲品種作為防治策略的一環亦有其難以克服的困難,如 抗蟲種源之獲得不易,害蟲的大量繁殖技術有待克服,育成一個可被 農民接受的抗蟲品種曠日費時,且大面積推廣後難免會被產生之有害 之生物小種所瓦解,以致前功盡棄。由此可知,若欲利用抗蟲品種為 害蟲防治的基礎,需有一合作團隊在政策及經費的持續支持下方可達 成。從國際上利用抗蟲品種於蟲害防治的事例中,不難發現無論在作 物種或害蟲種類均在急速增加中。利用抗病、蟲品種除可降低作物之 生產成本,增加國際競爭力外,同時亦可降低使用農藥對生態環境的 衝擊。如國際稻米研究所已育成15 種水稻品種同時對 7 至 8 種主要病

蟲害具中等以上之抵抗性,推廣於東南亞數百萬公頃水稻種植區(Panda

& Khush, 1995)。栽植此類水稻品種,農民幾乎不需使用農藥即可獲得 穩定的生產。惟上述之多抗性品種僅適於熱帶地區栽培之秈稻,並不

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