リンゴの幼木園における昆虫群集 : 園場における昆虫群集の研究 第1報

抄録

In the present paper is given the results of investigation made during the period from middle May through early December of 1953,on the composition and seasonal succession of insect association in the young apple orchard, mostly from the synecological standpoint. Although only 16 species were found, the fauna can be divided into twocharacteristic associations ; one is the apple leafcurling aphid (Myzus malisuctus MATSUMURA) association which includes some of Lyonetia prunifoliella HUBNER. As is shown in Figure 2,in successive weekly catches, a linear distribution of the logarithms of individual number of each species according to their ranks in number was ascertained ; MOTOMURA'S formula (1932), therefore, is applicable when we explain the relationship between the populations composing the association in the young apple orchard. By means of the correlation method given by MOTOMURA in 1935,the seasonal variation of association was studied. As is clear from Figure 5,the apple leaf-curling aphid association is formed during the period from June to September, and from October to December there is composed the apple leaf miner association having a characteristic simple formation. The influence of environmental factors to the association, has not been fully analysed in this survey.