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首页> 外文期刊>Journal of Plant Pathology >EFFECT OF CITRUS STUBBORN DISEASE ON NAVEL ORANGE PRODUCTION IN A COMMERCIAL ORCHARD IN CALIFORNIA
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EFFECT OF CITRUS STUBBORN DISEASE ON NAVEL ORANGE PRODUCTION IN A COMMERCIAL ORCHARD IN CALIFORNIA

机译：柑桔茎秆病对加利福尼亚商业果园脐橙生产的影响

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摘要

The impact of citrus stubborn disease (CSD), caused by Spiroplasma citri, on commercially cultivated citrus is not fully understood or quantified. Our objective was to measure these impacts on citrus production and assess bacterial distribution in trees having different symptom severities. S. citri-positive and adjacent healthy navel orange trees in a commercial grove in central California were evaluated. Measurements included canopy height and width, trunk diameter, fruit number and weight, and number of prematurely dropped fruit. Thirty fruit per tree were evaluated for color, size and sunburn. Juice was extracted, weighed, and total soluble solids and titratable acidity measured. Bacterial distribution in trees exhibiting mild or severe symptoms was assessed by q-PCR and spiroplasma culture. Fruit from S. citri-positive trees were smaller, and more often mis-shapen, than those from healthy trees. Significant fruit number reduction occurred only in severely symptomatic trees, in which S. citri was broadly distributed within the tree canopy. All other variables were statistically indistinguishable regardless of symptom severity or pathogen presence. The reduction in fruit weight, size and number in severely symptomatic trees validate the concern that CSD is a significant constraint to production and marketability in California.
机译：由柠檬螺旋体引起的柑橘顽固病（CSD）对商业种植的柑橘的影响尚未完全了解或量化。我们的目标是测量这些对柑橘产量的影响，并评估具有不同症状严重程度的树木中细菌的分布。在加利福尼亚州中部的一个商业林中，对柠檬酸链球菌阳性和健康的脐橙树进行了评估。测量包括冠层高度和宽度，树干直径，果实数量和重量以及过早掉落的果实数量。评价每棵树三十个果实的颜色，大小和晒伤。提取果汁，称重，然后测量总可溶固体和可滴定酸度。通过q-PCR和螺旋体培养评估细菌表现出轻度或严重症状的分布。与健康树相比，柠檬葡萄球菌阳性树的果实更小，而且畸形更大。仅在症状严重的树木中出现显着的果实数量减少，在这些树木中，柠檬葡萄球菌广泛分布在树冠内。不论症状严重程度或病原体是否存在，所有其他变量在统计学上均无法区分。症状严重的树上果实重量，大小和数量的减少证实了人们的担忧，即CSD是加利福尼亚州生产和销售能力的重要制约因素。

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