关键词: 新疆野苹果, 苹小吉丁虫, 抗虫性, 回归分析

Abstract: In order to understand the effects of bark thickness and diameter class on the apple buprestid (Agrilus mali Matsumura ) damage in Xinjiang wild apple varieties, Xinjiang wild apples with different resistance to apple buprestid were taken as plant material to find the relationship between the total number of insect and bark thickness, diameter class by correlation regression method. Results showed that there were big differences in apple buprestid damage severity existing in different wild apple single plant, among them feather hole numbers of XY-101 single plant were as high as 11.2. While that of XY-49 single plant was as low as 0. The total average population ranged from 0.3~11.2, and the differences were very significant. The regression equation between the total number of insect and diameter class, bark thickness were as follows: Y=1.236+0.119Z and Y=1.049+2.071H. Both equations went through the t test at P<0.05 significance level. Regression coefficient of variate Z was 0.119, which meant that when diameter class increased 1 mm, the total number of insect would increase to 0.119. Regression coefficient of variate H was 2.071, which meant that when bark thickness increased 1 mm, the total number of insect would increase to 2.071. Therefore, total number of insect were positively and linearly correlated with bark thickness and diameter class within a certain scope in Xinjiang wild apple. The total number of insects increased with the increasing of bark thickness and diameter class.

Key words: Xinjiang wild apple, Agrilus mali Matsumura, insect resistance, regression analysis