亚洲玉米螟的种群动态及危害

Population Dynamic and Damage of Ostrinia furnacalis in the Corn Fields

于2010年6-8月对亚洲玉米螟在秦皇岛地区春玉米田间落卵量和亚洲玉米螟为害玉米的严重程度及赤眼蜂自然寄生率进行了调查。结果表明,亚洲玉米螟在该地全年共发生2代,产卵高峰期分别发生在6月中旬和7月末至8月上旬,高峰期卵粒数分别达到400粒和374粒,第一代卵孵化率97.18%,第二代卵孵化率96.09%,田间花叶率86.00%,百株蛀茎孔数754,蛀茎株率100.00%,百株蛀雌穗孔数70,百株蛀雄穗数77,蛀雄穗株率77.00%,蛀雌穗株率66.92%;玉米螟赤眼蜂在春玉米的第二代卵粒的自然寄生率最高达到21.56%。通过调查及分析得出,亚洲玉米螟在秦皇岛地区发生及危害严重。

This paper investigated Ostrinia furnacalis including the number of eggs laid,damage degree of spring corn in the spring corn fields from June to August of 2010 in Qinghuangdao.The result showed that the occurrence of the Asian corn borer was two generations in the whole year,and peak stage of eggs laid occurred in the middle of June and the end of July to early August,with the number of eggs reaching 400 and 374 respectively.Furthermore,first generation hatchability of Asian corn borer,second generation hatchability of Asian corn borer,the percentage of damage leaves,damage stems and maize ears was 97.18%,96.09%,86%,100%,77% and 66.92% respectively.The numbers of holes,damage stems,and corn ears by the Asian corn borer for every 100 plants were 754,70 and 77 respectively.The natural parasitization of Trichgramma ostriniae reached 21.56%.