Evaluation of cotton nematicide combinations for reniform nematode management in Limestome County, Alabama, 2018

摘要

Gaucho, Copeo Prime, Aeris Seed Applied System, Velum Total and BioST Nematicide 100 were evaluated for reniform nematode management on cotton at the Tennessee Valley Research Center in Belle Mina, AL. The field was infested with the reniform nematodein 2007 and has been continuously cultivated in cotton. The soil is a Decatur silt loam soil consisting of 24% sand, 28% clay, and 49% silt. Seed treatments were supplied by Bayer Crop Science. Seeds were sown in plots that consisted of 2 rows, 7.3 m long with 1.0 m row spacing on 8 May. Plots were arranged in a randomized complete block design with five replications. Plots were maintained through the season with standard herbicide, insecticide and fertility production practices as recommended by the Alabam Cooperative Extension System, and a lateral overhead irrigation system was used as needed. Plant height, biomass, vigor and nematode population density data were collected at 37 DAP. Nematode population density was measured by extracting eggs from4 root systems randomly selected per plot using 6% NaOCl while roots were on a shaker for 4 minutes collected on a 25-um sieve, and recorded as total eggs per gram of root. Plots were harvested on 10 Oct. Data was analyzed in SAS 9.4 (SAS Institute Inc.)using Glimmix procedure with P < 0.1. Monthly maximum temperatures from planting in May through October were 86.2, 90.8, 91.0, 90.8 89.3, and 77.2 °F with average minimum temperatures 75.3, 79.8, 80.8, 80.0 , 79.4, and 66.1 °F, respectively. Rain fallaccumulation for each month was 3.40, 4.47, 2.20, 4.42, 3.09, and 2.44 in. with a total of 20.02 in. over the growing season.