Abstract
Development ofMeloidogyne incognita and formation of root galls on greenhouse-grown sugarbeet (Beta vulgaris L.) seedlings grown in sand was examined at 4-day intervals over a period of 40 days. The penetration and development of root-knot nematode on sugarbeet was asynchronous and multiform. The majority of second-stage juveniles (J2) entered the roots through the root tip region, including the root cap. Before growth began, body length and width of the invading J 2 decreased about 100,10. Infected root segments initiated galls within 4 days and galls became stainable within 6 days after infection. The males usually developed in groups. Body length of the vermiform adult males was approximately 5 times that of the J2. Mean size (length X width) of adult males was 1.9 X 0.05 mm and of females was 0.8 X 0.5 mm. Diameter of the females increased 16-30 fold between 8 and 40 days after infection of roots. In the same period, diameter of root galls increased 3 fold when plants were grown in sand; the size of root galls responded to the level of nutrients.
Published Version
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