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The Sex Ratios of Cyst-Nematodes Produced By Adding Single Second-Stage Juveniles To Host Roots

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For more content, see Nematology.

A method is described for adding a single juvenile of Heterodera avenae near a cereal plant. Single juveniles from different populations of H. avenae differed in their ability to invade host roots but the rate of invasion did not affect the proportion of males and females which developed. Differences in sex ratios on oats cv. Milford and cv. Sun II were due to changes in the number of juvenile females; there being no differences in the number of juvenile males which successfully developed. In the oat cv. CC 6510, resistant to H. avenae, few females were formed and male numbers were also reduced. With barley cv. Julia, British pathotypes 1 and 2 had a sex ratio of 1 whereas pathotype 3 had one of 8. H. cruciferae, H. schachtii, Globodera rostochiensis and G. pallida all produced a sex ratio of 1 on susceptible hosts (Cabbage, cv. Greyhound, tomato, cv. Moneymaker, Sugar beet, line c).

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


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