首页> 外文期刊>European Journal of Plant Pathology >Thermal time requirements of root-knot nematodes on zucchini-squash and population dynamics with associated yield losses on spring and autumn cropping cycles
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Thermal time requirements of root-knot nematodes on zucchini-squash and population dynamics with associated yield losses on spring and autumn cropping cycles

机译:西葫芦根结线虫的热时间要求和种群动态以及春秋两季的产量损失

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The present research was undertaken to evaluate the effects of soil temperature on the life cycle of root-knot nematodes (RKN) on zucchini-squash in growth chambers and to assess the relationship between Meloidogyne incognita soil population densities at planting (Pi), its multiplication rate, and crop losses of zucchini in field conditions. Thermal requirements for M. incognita and M. javanica were determined by cultivating zucchini plants in pots inoculated with 200 second stage juveniles (J2) of each Meloidogyne species at constant temperatures of 17, 21, 25, and 28 A degrees C. Number of days from nematode inoculation until appearance of egg laying females and until egg hatching were separately recorded. For life cycle completion, base temperatures (Tb) of 12 A(0)C and 10.8 A(0)C and accumulated degree-days above Tb (S) of 456 and 526, were estimated for M. incognita and M. javanica, respectively. The relationship between fruit weight and M. incognita Pi fits the Seinhorst damage function, but differed accordingly to the cropping season, spring or autumn. Tolerance limits for M. incognita on zucchini were 8.1 J2 per 250 cm(3) of soil in spring and 1.5 in autumn cropping cycles, and the minimum relative yields were 0.61 in spring and 0.69 in autumn. Zucchini-squash was a poorer host for M. incognita in spring than in autumn, since maximum multiplication rates (a) and equilibrium densities (E) were lower in spring (a = 16-96; E = 274-484) than in autumn (a = 270-2307; E = 787-1227)
机译:本研究旨在评估土壤温度对生长室中西葫芦南瓜根结线虫(RKN)生命周期的影响,并评估种植时根结线虫土壤种群密度之间的关系(Pi)率和西葫芦在田间条件下的农作物损失。通过在接种了17个,21个,25个和28个A的恒定温度的每个Meloidogyne物种的200个第二阶段幼虫(J2)接种的盆中种植西葫芦植物,来确定隐叶隐孢子虫和爪哇M. javanica的热需求。从线虫接种直至产卵雌虫的出现和卵孵化被分别记录。对于生命周期的完成,估计隐身梭菌和爪哇梭菌的基本温度(Tb)为12 A(0)C和10.8 A(0)C,高于Tb(S)的累积度日为456和526,分别。果实重量和隐孢子虫Pi的关系符合Seinhorst损害功能,但与春季或秋季的作物季节不同。西葫芦的耐受限度为春季每250 cm(3)土壤8.1 J2,秋季种植周期为1.5 J2,春季的最小相对产量为0.61,秋季为0.69。西葫芦南瓜在春季比秋季多发生一个隐孢子虫,因为春季的最大繁殖率(a)和平衡密度(E)低于秋季(a = 16-96; E = 274-484) (a = 270-2307; E = 787-1227)

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