Soybean Cultivars and Development of Populations of Meloidogyne incognita in Soil
Authors
R. Rodriguez-Kabana
D. B. Weaver
Keywords:
Plant Breeding, Population Dynamics, Resistant Varieties, Computer Modelling, Pest Management, Cultural Practices, Crop Losses, Nematode Ecology
Abstract
The effect of 3 soybean (Glycine max) cultivars on population development of Meloidogyne incognita was studied for 2 years in an infested field in south Alabama. Larval populations in soil developed according to the logistic equation model. The innate capacity for increase of the nematode population (r) was higher for 'Ransom than for the other 2 cultivars, 'Bragg' and 'Foster' The time required to attain 50% of the maximal possible population size for each cultivar was shortest for 'Ransom' sovbean and the same for 'Bragg' and 'Foster' Yields in unfumigated soil were highest for 'Foster' and lowest for 'Ransom', however, in soil treated with 16.8 L ai/ha of EDB. 'Ransom' was the highest yielding cultivar in 1982 and 'Foster' in 1983. Percent yield increase in response to fumigation was lowest for 'Foster' and highest for 'Ransom in both years.
