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在玉米矮花叶病重病区抚宁县,自播种王玉米10叶1心期,每天定点定株调查有翅蚜蚜量和玉米矮花叶病病株率。田间调查结果表明,5月22日,玉米2叶期始见蚜虫,蚜株率6.6％,总蚜量7头。5月31日,玉米3叶期蚜量达到高峰,蚜株率89.6％。总蚜量366头。高峰期过后8d.6月8日始见病株,病株率1％;高峰期过后28d,6月28日,玉米9叶期,病株率达到高峰22％,并维持此高峰。生产上制定防治措施应遵循此规律。
In the county of Funing County with low rate of maize dwarf mosaic disease, from the 10-leaf stage of sowing king corn, the rate of aphid population and the rate of maize dwarf mosaic disease were investigated daily. Field survey results showed that on May 22, aphids were found in the second leaf stage of maize. The aphid strain rate was 6.6% and the total aphid population was 7. On May 31, the amount of aphids in the 3-leaf stages of maize peaked, with aphid strain rate of 89.6%. Total amount of aphids 366 head. 8d after the peak period. The diseased plants began to see on June 8, with 1% diseased plants. On the 28th day and the 28th day after the peak, the rate of diseased plants reached the peak of 22% at the 9-leaf stage of maize and maintained this peak. The production of prevention and control measures should follow this rule.