【摘要】 本文分析了桔全爪螨Panonychus citri（McG.）的为害对柑桔经济产量的影响。由通径分析发现,该螨对经济产量的影响是通过影响结果枝有效光合面积起作用的。该螨吸食叶片,致使光合作用下降;为害严重时,采果前落叶直接影响叶果比,从而影响果重、果实大小和品质。据此导出叶片受害（X）与果重（Y）的确定性函数关系:Y=7.7567A^c-0.02041A-0.9365^S-0.3656^X+0.0006186^X2+11.54式中A为果枝最佳叶面积,S为受害引起落叶百分率。更多还原

【Abstract】 In this paper, the influence on the economic yield of orange by damage of citrus red mite was further analysed based on the author’s prior research work.Path analysis showed that, the mite acts on economic yield through the influence on the effective photosynthesis areas on fruit-bearing shoots, sucking the leave juice,causing the decline of photosynthesis capacity when the situation is serious, the ratio between leaves and fruits is influenced by fallen leaves before fruit picking, thereby the weight, size and quality of the fruit are affected.In view of the above, the definite function relation between the degree of injured leaves and the weight of fruits were given as following:Y=7.7567Ae^-0.02041A-0.9365S-0.3656X+0.0006186X²+11.54更多还原