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Effect of Temperature On the Life Cycle of Pratylenchus Penetrans On Cryptomeria Seedlings and Observations On Its Reproduction

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The life cycle of P. penetrans on Cryptomeria seedlings was studied at each of five temperatures, 15°, 20°, 24°, 30°, and 33°C by following the reproduction of a solitary female inoculated per seedling root and the development of its offspring. The life cycle was completed in 86 days at 15°, in 42-44 days at 20°, in 35 days at 24°, and in 30-31 days at 30°. At 33°, the development was inhibited. The incubation period of eggs was 25 days at 15°, 14-16 days at 20°, 8-10 days at 24°, and 9-10 days at 30°. The nematode produced nearly the same number of offspring within a generation period at each temperature of 15°, 20°, and 24°. At 30°, however, reproduction was slightly suppressed. At 24°, females of P. penetrans laid an average of 1.1 eggs each day for about 35 days. The maximum number of eggs laid by a female was 68. Males were necessary for reproduction in this species.

Affiliations: 1: Government Forest Experiment Station, Tokyo, Japan


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