INFLUENCE OF TEMPERATURE ON MELOIDOGYNE-INCOGNITA ON SOYBEAN

  • 1 January 1979
    • journal article
    • research article
    • Vol. 11  (1) , 62-70
Abstract
The effects of temperature and initial inoculum density of M. incognita on soybean [Glycine max] growth and nematode reproduction were investigated in greenhouse temperature tanks and in controlled-growth chambers. The interactions of initial inoculum density (Pi) and soil temperature in effects on shoot growth were adequately described by multiple-regression models. At the highest temperatures (30 or 32/28.degree. C), moderate to high inoculum killed many plants. A Pi [initial population density] of 27,000 eggs/15 cm diameter pot retarded shoot growth at 26.degree. C. Only the greatest Pi (81,000 eggs/15 cm pot) suppressed shoot growth at 18, 22, or 20/16.degree. C. Inoculation with 3000 or 9000 eggs/plant resulted in heavier root systems at all temperatures except 30.degree. C. At that temperature, 9000 eggs suppressed root growth. At 18 and 26.degree. C, a Pi of 81,000 eggs was required to retard root growth. Nematode reproduction was related directly to temperature and Pi except at a density of 81,000 eggs/15 cm pot.