柑桔锈螨对柑桔的为害及防治指标的初步研究

A PRELIMINARY STUDY ON THE DAMAGE AND ACTION THRESHOLD OF CITRUS RUST MITE TO CITRUS

本文就柑桔锈螨〔Phyllocoplruta oleivora(Ashm。)〕对柑桔的为害及经济损失进行研究。方差分析结果表明,不同受害面积和不同锈斑颜色的叶片叶绿素含量有显著或极显著差异。果实锈斑颜色级别与果重、果实大小及糖、酸、Vc、糖酸比等营养成分含量也存在显著或极显普差异。被害时间越早,锈螨发生量及叶、果受害面积越大,落果和裂果率越高,果实直径越小、果重越轻。应用该螨的种群动态及其为害引起的产量及经济损失资料,建立该螨的动态防治指标模型。并利用1986年四川开县调查数据,获得一组双因子防治指标系列。

In this paper,the effects of injury caused by citrus rust mitePhyllocoptruta Oleivora(Ashm.)on the yield,quality and economic lossof citrus were studied in 1985-1986.The results showed that there weresignificant or highly significant differences among the chlorophyllcontents of the citrus leaves beared different size of injured area andcolours of rust blotches,and among different rust colour levels oncitrus fruits and their qualities such as the weight,diameter and nutri-tion contents(sugar,acid,Vc,etc.).The mite density,injured areaon leaves and fruits,and the premature drop and split rates of fruitincreased as well as the diameter and weight of fruit deereased withthe advance of damage time.Based on the mite population dynamics,yield damage and eco-nomic loss caused by this mite,a dynamic action threshold model wasdeveloped.According to the investigation data from Kaixian County,Sichuan Province in 1986,a series of dualfactorial action thresholdswere presented.