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Sex Attractants and Behavior in the Two Races of Radophol Us Similis

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image of Nematologica
For more content, see Nematology.

Sex pheromones are strongly implicated as premating mechanisms of reproductive isolation between the two races of Radopholus similis. Citrus race males do not respond to the banana race females at all; the pheromone of the citrus race female attracts banana race males but does not promote mating. This behavioral divergence between the two races may well be the result of selection for premating isolation that took place after the citrus race evolved. The banana race male recognizes basic components of the citrus race females "long range" attractant, but the "close range" pheromone or mating stimulant is incomplete, resulting in altered behavior when males of the former race are in close contact with females of the latter. This indicates that the pheromone blend contains multiple components, some of which may be more divergent than others.

Affiliations: 1: USDA ARS, Plant Protection Institute, BARC-West Beltsville, MD 20705; 2: Department of Entomology and Nematology, University of Florida Gainesville, FL 32611; 3: USDA ARS Horticultural Research Laboratory 2120 Camden Rd., Orlando, FL 32803


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