Hutton, Dave G.; Coates-Beckford, Phyllis L.; Eason-Heath, Sharon A.E.
Author Affiliation, Ana.
Agriculture Unit; Department of Life Sciences
Management of Meloidogyne incognita populations by crop rotation in a small-scale field trial and nematode pathogenic effects on selected cultivars
Date of Publication
The density of field populations of the root-knot nematode, Meloidogyne incognita Race I, was suppressed and maintained at a low level for 3 yr in a small-scale crop rotation trial. The cropping sequence from mid-August, 1978, to early January, 1982, was: a 3:1 mixture of red and white sorrel (Hibiscus sabdariffa); a 5-wk weed fallow; cassava (Manihol esculento): a 1- and 3-mo weed and clean fallow, respectively: chinese cabbage (Brassicu thinensis); maize (Zeu mays); red kidney beans (Phuseolus vulgaris): a mixed crop of cowpeas (Vigna unguiculala and callaloo (Amaranthus viridis): and finally, red sorrel. The density of Pralylenchus sp. increased in cassava and maize rhizosphere soil while those Helicolylenchus sp. and Rotylenchulus reniformis increased in maize and cowpea rhizosphere soil. Tylenchorhynchus sp. density increased during the cultivation cowpea of red kidney beans and callaloo intercropped with cowpeas. Roots of the first crop of red sorrel and maize yielded large numbers of M. incognita and Pratylenchus sp., respectively. In a greenhouse test, M. incognitainfested all cultivars grown in the field trial but callaloo and white sorrel appeared to be less suitable host of the nematode than the other test plants. The root-knot nematode adversely affected growth of all greenhouse-grown crops, except cassava.....