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The Effect of Temperature On Development and Generation Periods of Aphelenchoides Besseyi

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Body length of Aphelenchoides besseyi Christie in second, third and fourth molts reared on Fusarium solani was found to fall into three consecutive but discrete ranges. The body length of the nematodes in the second molt remained within 225-375 μ under the temperatures tested (16-30°C), while that of the third and fourth molts respectively spread over broader ranges and varied slightly with temperature. When initial inocula consisted exclusively of adults, the percentage of juveniles in a particular age bracket in the population fluctuated with the age of culture. Body length of the second molt was employed to identify the juveniles in an age bracket which should be of second or third developmental stages. Based on the fluctuation curves, generation periods of the nematode reared on F. solani under 16 °, 20 °, 23°, 25 °, 30° and 35° were estimated respectively to be 24 ± 4, 15 ± 2, 9 ± 2, 11 ± 2, 10 ± 2 and 8 ± 2 days. The optimum temperature for oviposition and hatching appeared to be 30°. At 35° the nematode failed to build-up its population, though oviposition, hatching and molting took place.

Affiliations: 1: Plant Nematology Laboratory, Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan


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