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The Influence of Host Nutrition and Intensity of Infection On the Sex Ratio and Development of Meloidogyne Incognita in Sterile Agar Cultures of Excised Cucumber Roots 1)

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For more content, see Nematology.

Rate of development of Meloidogyne incognita was decreased at reduced concentrations of sucrose and iron chelate. Decreasing the concentrations of vitamins and macronutrient salts resulted in an increased rate of nematode development. The concentration of the macronutrient salts also had a profound influence on the nature of the gall. Galls on a medium deficient in the macronutrient salts were much larger and less compact than those on complete nutrient. Sex-ratio of M. incognita was dependent upon host nutrition but not upon intensity of infection. At reduced sucrose concentrations, 100 percent males occurred. Rate of development was inversely proportional to the number of nematodes added to the culture and to the number of nematodes per gall.

Affiliations: 1: Rutgers, The State University, New Brunswick, New Jersey; 2: Department of Nematology, University of California, Davis, California, U.S.A.


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