Impact of Rotation and Fumigation on 2006 Cotton Production in Reniform Infested Cotton Fields. Gazaway, W.S., K. Lawrence, and J.R. Akridge Auburn University.

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Presentation transcript:

Impact of Rotation and Fumigation on 2006 Cotton Production in Reniform Infested Cotton Fields. Gazaway, W.S., K. Lawrence, and J.R. Akridge Auburn University

Test Field Placed in a cotton field with high reniform populations, located near Huxford, AL. Infested with reniform nematodes since mid 1980’s. Sustained substantial yield losses to reniform nematodes over last 20 years.

Objective of Study Evaluate: Non-host crops’ effect on cotton yield and on reniform populations. Compare 1- and 2-year rotations. If nematicide applied to cotton following rotation will further improve yield?

Crops Cotton- DPL449 BG/RR Corn- Pioneer 33M53RR Soybean- DPL 5634RR Peanut- AP 3

Nematicide Telone II- applied to ½ the cotton plots. Injected 3 gal/acre 18 in. deep into raised seed beds 3 weeks prior to planting.

Rotation Study Design 4 rows wide X 40 ft long. 32 treatments. 4 replications. Designed so 1- and 2- year cotton yields could be compared the same year. Randomized split plot.

128 Plots- covers approximately 5 acres

Treatments evaluated in 2006 Yield data from Telone treated and untreated cotton plots following 1-year rotation with soybean, corn, peanut and continuous cotton. Total= 20 plots. Nematode population data from 2 year non-host rotation plots plus 2006 cotton plots. Total= 32 plots.

plotsyieldnematodes peanut 4noyes corn 4noyes soybean 4noyes peanutcotton4yes corncotton4yes soybeancotton4yes cotton-N 4yes cotton 4yes Data Evaluated in 2006

2006 Results

Pooled Data for Nematicide Reniform/100ccCotton 2006 Yield/Acre 4/1311/13 Telone LB Untreated LB LSD (0.05) LB Prob (F)

Pooled Data for Crops 2005 CropReniform/100ccCotton(2006) (LB/Acre) 4/1311/13 peanut LB corn LB soybean LB cotton LB LSD (.05) LB Prob (F)

No Crop x Nematicide Interaction crop4/1311/13Cotton yield Cotton (N) LB Cotton LB Corn (N) LB Corn LB Peanut (N) LB Peanut LB Soybean (N) LB Soybean LB LSD(.05) LB Prob (F)

Peanut vs Cotton (+)(-) Nematicide Impact on Reniform Populations

2 years versus 1 year non-host crops impact on reniform populations

Conclusion Addition of nematicide to cotton following 1 year of peanut and corn did not improve yield. Nematicide did improve cotton yield following soybean or cotton. One year rotation with corn and peanut as effective in improving cotton yield as Telone treatment.

Conclusion Reniform populations rebound to damaging levels in 1 year back in cotton. Reniform populations higher in plots with 2 years cotton (2005 & 2006) than in plots with just one year in cotton (2006). Two years of corn or peanut had lower reniform populations than 1 year corn or peanut ( e.g.cotton in 2005; corn or peanut in 2006).