收效甚微 Little effect
不过收效甚微 Largely Unsuccessfully
效用甚微 To avail one little
效甚微
The effect is very little.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
由于常规农药对枯萎病防效甚微，并且抗病性品种缺乏，枯萎病已经成为制约黄瓜生产的限制性因素。
Due to the lack of effective chemical fungicides and resistant varieties, fusarium wilt has become the limiting factor in cucumber production.
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