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【目的】探讨新疆野苹果不同类型单株对苹果小吉丁虫危害的抗性差异,提出简化抗性指标调查的方法。【方法】以具有不同抗苹果小吉丁虫(Agrillus mali Matsumura)特性的新疆野苹果类型单株为试验材料,通过在苹果小吉丁虫疫区实地调查,摸清新疆野苹果受苹果小吉丁虫的危害特点,利用聚类及最优回归分析法简化抗性指标。【结果】在木段直径大于3 cm和木段直径小于3 cm的径阶上,低抗类型单株的枯枝率极显著大于高抗类型,低抗类型野苹果单株枯枝率在44.92%~82.52%区间,其中XY-108枯枝率高达82.52%,高抗类型单株枯枝率在4.17%~21.33%区间;低抗类型的羽化孔数、总虫口数显著大于高抗类型,其中低抗2单株羽化孔数最高11.2个,危害最为严重;因子聚类分析后,把危害指标聚为4大相似水平类,将新疆野苹果受苹果小吉丁虫危害调查从10个指标简化为4个,并建立了苹果小吉丁虫总虫口数低抗类型和高抗类型最优回归模型,分别为:Y=38.97+1.000 9X_1+1.490 4X_2,R~2=0.949 009,Y=7.48+7.794 4X_1+0.818 5X_2-8.354 3X_3,R~2=0.999 955。【结论】新疆野苹果存在高抗苹果小吉丁虫类型单株,高抗类型和低抗类型在枯枝率及总虫口数、羽化孔数等抗虫指标间差异较大。
【Objective】 The objective of this study was to investigate the differences in resistance between different apple trees and their susceptibility to the disease, and to propose a method to investigate the simplified resistance index. 【Method】 The single-plant species of wild apple of the genus Agrillus mali Matsumura was used as experimental materials. Through the field investigation of the small-gibetanus, Hazard characteristics, the use of clustering and optimal regression analysis to simplify the resistance index. 【Result】 The results showed that in the diameter stage with the diameter greater than 3 cm and the diameter less than 3 cm, the rate of dead branches of low-resistant plants was significantly higher than that of high-resistant ones. The rate of dead branches per plant was 44.92 % ~ 82.52%, among which the rate of XY-108 was 82.52% and the rate of high-resistant type was 4.17% ~ 21.33%. The number of low-resistant eclosion holes and total number of insects was significantly higher than that of high-resistance type, Among them, the number of emergence of low resistant plants per plant was 11.2, which was the most serious. After cluster analysis, the hazard indexes were grouped into 4 similar levels. The investigation of Xinjiang wild apples by the apple jejuni was simplified from 10 indicators The results showed that the optimal regression model of the population of low-resistant and high-resistant strains of Y.japonica was Y = 38.97 + 1.000 9X_1 + 1.490 4X_2, R ~ 2 = 0.949 009, Y = 7.48 + 7.794 4X_1 + 0.818 5X_2-8.354 3X_3, R ~ 2 = 0.999 955. 【Conclusion】 Xinjiang apple has the highest resistance to P. jacobinosta. The varieties with high resistance and low resistance have great differences in the rate of dead branches, the total number of insects and the number of emergence holes.