Nematropica (2006) 36, 53-66
J.R. Jones, K.S. Lawrence and G.W. Lawrence (2006)
Evaluation of winter cover crops in cotton cropping for management of Rotylenchulus reniformis
Nematropica 36 (1), 53-66
Abstract: Thirty-one winter cover crops and varieties were tested for host status to Rotylenchulus reniformis in greenhouse tests, and eight were selected for further microplot and field trials. Greenhouse trials indicated that crimson clover, subterranean clover, and hairy vetch serve as good hosts for R. reniformis. Reproduction factors (Rf) for those crops were 7.2, 2.2, and 3.7, respectively when grown in the greenhouse at an average temperature of 30°C. 'Licapo' rape, 'Tyfon' mustard spinach, 'Barnapoli' rape, PI2863 and PI4048 canola, produced Rf values of 1.3, 1.1, 1.0, 1.0, and 1.2 as compared to the Rf value of 4.2 on cotton when grown at an average temperature of 21°C. Varieties of radish, black mustard, white mustard, canola, lupin, ryegrass, wheat, oats, and rye produced Rf values of less than 1 indicating R. reniformis did not reproduce on these hosts. In microplot and field trials, R. reniformis population densities did not increase on crimson clover, subterranean clover, and hairy vetch over the winter months under natural conditions. Aldicarb applied in the seed furrow at cotton planting subsequent to cover crop termination, decreased R. reniformis population densities for 90 days after planting compared to the untreated control. Seed cotton yields were not affected by the cover crop but increased an average of 20% in all plots treated with aldicarb. Although crimson clover, subterranean clover, and hairy vetch were shown to be hosts of R. reniformis in greenhouse tests, the populations did not increase on these cover crops under the natural environmental conditions of the field and microplot tests.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Kathy S. Lawrence
Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
resistance/tolerance/defence of host
