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Effects of Daylength On the Multiplication of Potato Cyst-Nematode (Globodera Spp.) Populations

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For more content, see Nematology.

The effects of different daylengths (12 and 16 hr) on hatching, invasion of the host, and reproduction of different populations of potato cyst-nematodes on European potato plants, Solanum tuberosum ssp. tuberosum, were studied. Invasion and root weight were greater in plants grown in 16- than in 12-hr days. The ratio of male to female larvae of G. pallida hardly changed but the ratio of male to female G. rostochiensis larvae was greater in 16- than in 12-hr days. Populations of both species from Europe tended to produce more cysts on plants grown in 16-hr days, but G. rostochiensis from Peru produced more on plants grown in 12-hr days. Hatching from cysts produced in 16-hr days was also greater than from those produced in 12-hr days but no significant differences between activities of root diffusates produced in different daylengths were found.

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


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