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向日葵播种期对防治向日葵螟和黄萎病的影响

, PP. 413-418

Keywords: 向日葵,播种期,向日葵螟,黄萎病

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Abstract:

为了明确向日葵不同播期对防治向日葵螟和黄萎病的影响,于2009年5月11日至6月10日在内蒙古巴彦淖尔地区分7个时期(间隔5天)种植食葵和油葵,并系统调查向日葵螟和黄萎病的发生危害情况。结果显示,食葵和油葵的向日葵螟危害率及向日葵螟密度均以5月26日种植的最低,分别为8.00%、4.00%和0.14头/盘、0.16头/盘。随着播种期的推迟,食葵和油葵的黄萎病发病率自5月11日的98.67%和100.00%逐渐降至6月10日的24.00%和32.00%,发病级别从5月11日的2.83级和3.27级逐渐降至6月10日0.36级和0.64级,差异达到显著水平。食葵以5月31日播种的产量最高,而油葵以6月5日播种的产量最高。证明适时晚播可有效减少向日葵螟和黄萎病对向日葵的危害。

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