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The Interrelationships of Some Heterodera Spp. Indicated By the Specificity of the Male Attractants Emitted By Their Females

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For more content, see Nematology.

The attractiveness of the secretions from females of ten Heterodera spp. to males of the same and of the other species suggests the division of the genus into at least three sub generic groups; 1. H. schachtii, H. glycines and H. trifolii; 2. H. carotae, H. cruciferae and H. goettingiana; 3. H. rostochiensis, H. mexicana, H. tabacum and possibly H. avenae. Females of species within these groups are always attractive to males within the same group and the interactions between groups can be explained only by postulating at least six distinct attractive substances. Possibly females of ancestral forms secreted a wide range of attractants and their males responded to all of them. Decreases in the number of attractants secreted by the females or in the number to which the male responds indicate increasing specialisation. Females of one species were not necessarily attractive to males of another in a different group even though females of the latter attracted males of the former.

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


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