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Development of the False Root-knot Nematode, Nacobbus aberrans, on Sugarbeet

, : Development of the False Root-knot Nematode, Nacobbus aberrans, on Sugarbeet. Journal of Nematology 15(2): 288-296

The duration of the embryogenic development of N. aberrans (= N. batatiformis) took 9-10 days at C and 51 days at C. The J1 [1st stage juvenile] molted in the egg; hence the J2 [2nd stage juvenile] emerged from the egg. The effect of distilled water and root leachates of kochia [Kochia scoparia] and sugarbeet was investigated at 5, 10, 15, 20 and C. Root leachates did not significantly affect the percent of cumulative hatch of eggs, but temperature did significantly affect emergence of juveniles (P = 0.05). Less than 1, 5 and 20% of eggs hatched at 5, 10 and C, respectively. The percent of cumulative hatch at C was 4 times greater than at C; the highest percentage of juveniles emerged at C. The duration of postembryogenic development from J2 inoculation until the appearance of mature females with egg masses took 38 days, and the life cycle from egg to egg was completed in 48 days at C. All immature stages, young females and males were migratory endoparasites. Young females were able to leave the root swellings, where they developed from juvenile stages, and re-enter the root, where they formed a true gall and became sedentary. Thirty days after inoculation with J2 nematodes, specimens were detected in root tissues at 10, 15, 20, 25 and C, but not at C. Five days after inoculation at C (.+-. C), juveniles had penetrated the roots and caused slight swellings of the tip and axis of sugarbeet feeder roots. Large cavities extended from the cortical parenchyma to the periphery of the stelar area, and 50% of the central cylinder was destroyed 25 days after inoculation at C. No synctia formation were detected in the sugarbeet root swellings infected with juveniles. Syncytia were associated only with adult females; hyperplasia, abnormal proliferation of lateral roots, and asymmetry of root structure were additional anatomical changes induced by adult females. Only very smooth annules but no cuticular ornamentations were noted by SEM [scanning electron microscope] on the perineal area of adult females.


PMID: 19295804

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