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The Effect of Ultra-Violet Radiation On the Invasion, Survival and Fertility of Larvae of Heterodera Rostochiensis

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Suspensions of second stage (newly hatched) larvae of H. rostochiensis were exposed to ultraviolet radiation at doses from 16 to 16,000 μw-min/cm2 and of H. schachtii at doses from 500 to 16,000 μw-min/cm2. Both species were immobilised after 10,000 μw-min/cm2. The number of H. rostochiensis larvae invading and establishing in potatoes decreased to one tenth after 500 μw-min/cm2 and the numbers of males and females which developed decreased proportionately. Even after 500 μw-min/cm2 both the males and females were fertile.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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