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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。
In order to clarify the effects of different sowing date on the control of sunflower leaf borer and Verticillium wilt, solar ewes and sunflower oil were planted in Bayannur region of Inner Mongolia from May 11 to June 10, 2009 (interval 5 days) , And systematically investigated the occurrence of sunflower borer and Verticillium wilt. The results showed that sunflower and sunflower sunflower borer damage and sunflower leaf borer density were the lowest on May 26, planting 8.00%, 4.00% and 0.14 head / dish, 0.16 head / dish. With the delay of sowing date, the incidence of Verticillium wilt in sunflower and sunflower decreased from 98.67% and 100.00% on May 11 to 24.00% and 32.00% on June 10, respectively. The severity of the disease increased from May 11 The levels 2.83 and 3.27 gradually dropped to 0.36 and 0.64 levels on June 10, reaching significant differences. Sunflower was the highest seeding crop on 31 May, while the sunflower was the most seeding on 5 June. It is proved that timely evening broadcast can effectively reduce the sunflower borer and Verticillium wilt damage to sunflower.