Belonolaimus longicaudatus is a recognized pathogen of cotton (Gossypium hirsutum), but insufficient information is available on the population dynamics and economic thresholds of B. longicaudatus in cotton production. In this study, data collected from a field in Florida were used to develop models predicting population increases of B. longicaudatus on cotton and population declines under clean fallow. Population densities of B. longicaudatus increased on cotton, reaching a carrying capacity of 139 nematodes/130 cm³ of soil, but decreased exponentially during periods of bare fallow. The model indicated that population densities should decrease each year of monocropped cotton, if an alternate host is not present between sequential cotton crops. Economic thresholds derived from published damage functions and current prices for cotton and nematicides varied from 2 to 5 B. longicaudatus/130 cm³ of soil, depending on the nematicide used.
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机译：Belonolaimus longicaudatus是公认的棉花病原体（陆地棉），但关于棉花生产中的B. longicaudatus种群动态和经济门槛的信息不足。在这项研究中，从佛罗里达州的一个田地收集的数据用于建立预测棉花上的长双歧杆菌种群增加以及干净休耕条件下种群减少的模型。在棉花上，长双歧杆菌的种群密度增加，达到每土壤130立方厘米139线虫的承载能力，但在裸露的休耕期则呈指数级下降。该模型表明，如果连续的棉花作物之间没有替代寄主，则单作棉花的人口密度每年都会降低。棉花和杀线虫剂的公布的破坏函数和当前价格得出的经济阈值在2至5 B. longicaudatus / 130cm³土壤之间变化，具体取决于所使用的杀线虫剂。
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