以孝顺竹第1年生受害新竹为观察对象,对居竹伪角蚜的种群动态及主要天敌、气候等生态因子进行调查,结果发现:竹蚜5月中下旬始发生于2008年新笋基部,随着若蚜的迁移扩散至整个竹丛,其种群密度在2008年的8—9月达到最高峰,随后下降,2009年3月初种群密度开始上升,直至新竹第1年生长发育结束。1~4龄若蚜全年同时发生,种群中2个龄期段密度的比例(3~4龄 : 1~2龄)从2008年的10月初至2009年3月中旬的平均值为0.912,而其余月份的平均值在0.5左右。竹蚜3种主要天敌的发生时间具有一定的规律性,其中食蚜蝇发生高峰期在2008年的3—5月,赤星瓢虫发生高峰期为2008年的8—9月,蚜灰蝶在全年中存在2个高峰期,分别为2008年的7—8月和2008年11月—2009年2月。蚜灰蝶可全年在竹杆上取食竹蚜,赤星瓢虫和食蚜蝇从2008年12月中旬至翌年2月底以成虫藏于箨叶或竹丛周围的杂草中越冬。降雨对蚜虫种群密度有一定影响,连续数天的强降雨能基本清除竹丛8.33%~20% 的受害株上的蚜虫。
Pseudoregma bambusicola is a pest of Bambusa multiplex. In this study, population dynamics of P. bambusicola were investigated in one-year-old B. multiplex coupled with ecological factors such as natural enemies and weather. The aphids were observed to firstly infest the bottom of bamboo shoots in late May in 2008, and then disperse into the whole bamboo clusters quickly. Population density of the aphids was highest during the period from August to September in 2008, then declined, and it did not rise until the early March in 2009. The 1st-4th instar nymphae could be found contemporarily in the whole year yound, however the age ratio of the nymphae (the 3rd-4th instar population:the 1st-2nd instar population) was classified as two distinguishable stages, one from early October in 2008 to the mid-March in 2009 with the ratio of 0.932, the other in the rest time with around 0.5. In the meanwhile, the occurence of three dominant natural enemies was regular pattern dependent on time. The population density of Asilidae sp. was highest from March to May in 2008, and the peak of population density of Lemnia saucia occurred between August and September in 2008, and the population density of Taraka hamada showed two peak periods during separately from July to August in 2008, and from November of 2008 to February of 2009. Among the three natural enemies, only Taraka hamada could prey on bamboo aphids all-year-round, and other two predators overwintered in the weeds beside the bamboo clusters from December in 2008 to February in 2009. Precipitation had some effect on population density of the bamboo aphids to some extent, and around 8.33%-20% of the aphids in the infested bamboo clusters was removed by continuously heavy rainfall.
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