摘要
海南岛西有部蝗区东亚飞蝗的前翅长度(E)与后足股节长度(F)的比值,群居型雌成虫为2.02～2.21,雄成虫为1.37～2.18;过渡型雌成虫为2.05～2.17,雄成虫为2.00～2.15;散居型雌成虫为1.91～2.16,雄成虫为1.93～2.08。散居型的E/F比值接近广西、江苏蝗区东亚飞蝗种群,它们应属同一个地理种群。在海南岛西南部东亚飞蝗每年发生4～5世代,世代重叠,无越冬现象。成虫喜欢聚集产卵,容易形成群居型。成虫和蝗蝻都有聚集为害和成群迁移的习性。一般情况下,大田第三、四代京亚飞蝗(约8月至9月发生)数量逐步增加,容易暴发为害。因此重点防治第三代、控制第四代大发生是海南岛西南部蝗区防治东亚飞蝗的重要对策之一。
Morphological quantity determinations revealed the following characteristics of the Loeusta migratoria manilensis(Meyen)in southwestern Hainan: E/F of aggregational female adults being 2.02--2.21, male 1.87--2.18; E/F of transitional female adults 2.05--2.17, male 2.00-2.15; E/F of dispersive female adults 1.91--2.16, male 1.93--2.08. The E/F of dispersive female and male of the locust oceured in southwestern Hainan resembles that of Guangxi and Jiangsu locust population, so they must belong to the same geographical population. The difference reflects the characteristics of its tropical distribution. Bionomies observations found the number of annual generations of Locusta migratoria manilensis(Meyen)with 4--5 in southwestern Hainan in Sanya, Ledong, Dongfang, Changjiang and Danxian, etc.. Their generations are overlapping, without winter hibernation. The adults prefer ovipositing aggregatively, so it is easy to form aggregational pattern. The adults and nymphs have the habit of aggregational damage and immigration. The population of the pest increase easily to a high damage level in the field in the third and fourth generations(from Aug. to Sept.). So control of the third generation isa basic strategy for the good management of the pest in southwestern Hainan.
出处
《热带作物学报》
CSCD
1991年第2期93-98,共6页
Chinese Journal of Tropical Crops
关键词
东亚飞蝗
形态
生活习性
生物学
Locusta migratoria mauilensis (Meyen)
morphology
blology
