The population dynamics includes quantity dynamics,space dynamics and temporal dynamics. They are interdependent and mutually *** cluster analysis was carried out with the data of mean densities,indices of patchiness ...
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The population dynamics includes quantity dynamics,space dynamics and temporal dynamics. They are interdependent and mutually *** cluster analysis was carried out with the data of mean densities,indices of patchiness and occupied plot rates of Chorthippus fallax (Zubovsky)on Ganjia High Mountain Grassland in Xiahe County,Gansu Province. The results showed that the population dynamics of this grasshopper could be divided into four distinct periods,i.e.,the initial stage of hatching and the last stage of adult,the peak stage of nymph,the initial stage of adult,and the peak stage of first nymph and the adult. The peak period of nymph was in the middle ten days to the last ten days of July. In this period,the eggs were completely hatched,the population was mainly composed of nymphs of 2 and 3 instars,and the population size was related to the numbers and harmful levels of this grasshopper in the same ***,this period was the key time for population prediction and chemical control.
在黄波罗上发现一种新的害虫黄波罗丽木虱(Calophya nigra Kuwayama)。由于成、若虫直接刺吸和若虫排出含糖粪便引起煤污病,严重影响树木的生长和发育。定点、定期野外观察及盆栽培幼苗接种木虱饲养试验,该虫在哈尔滨一年三代,以第三代...
详细信息
在黄波罗上发现一种新的害虫黄波罗丽木虱(Calophya nigra Kuwayama)。由于成、若虫直接刺吸和若虫排出含糖粪便引起煤污病,严重影响树木的生长和发育。定点、定期野外观察及盆栽培幼苗接种木虱饲养试验,该虫在哈尔滨一年三代,以第三代成虫在枯枝落叶层下,土缝内越冬。翌年5月上旬越冬成虫进行补充营养。卵散产于叶背主脉两侧。若虫共三龄,固定于叶背面取食。用模糊聚类的方法对该虫的种群动态进行了分析,成虫种群动态分7类,若虫和卵各分2类。另外,对其分布、危害及发生规律也进行了初步研究。
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