Post on 06-Jan-2016
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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.
2005 2006 plots yield nematodes
peanut peanut 4 no yes
corn corn 4 no yes
soybean soybean 4 no yes
peanut cotton 4 yes yes
corn cotton 4 yes yes
soybean cotton 4 yes yes
cotton-N cotton-N 4 yes yes
cotton cotton 4 yes yes
Data Evaluated in 2006
2006 Results
Pooled Data for Nematicide
Reniform/100cc Cotton 2006
Yield/Acre4/13 11/13
Telone 736 2344 1799 LB
Untreated 767 3455 1540 LBLSD (0.05) 353 803 112 LB
Prob (F) 0.86 .009 .0013
Pooled Data for Crops
2005 Crop Reniform/100cc Cotton(2006)
(LB/Acre)4/13 11/13
peanut 257 2321 1753 LB
corn 753 2592 1734 LB
soybean 856 3235 1522 LB
cotton 1140 3450 1550 LBLSD (.05) 499 1135 158 LB
Prob (F) .0115 .1620 .0086
1753 1734
15271550
1400
1500
1600
1700
1800
2006 Seed Cotton Yield (LB/A)
pnut corn sybn cot
No Crop x Nematicide Interaction-2006
2005 crop 4/13 11/13 Cotton yieldCotton (N) 1194 2887 1733 LBCotton 1086 4013 1366 LBCorn (N) 708 2032 1766 LBCorn 798 3152 1702 LBPeanut (N) 322 2028 1838 LBPeanut 192 2615 1668 LBSoybean (N) 721 2431 1619 LBSoybean 991 4040 1424 LBLSD(.05) 705 1605 223 LB
Prob (F) .082 0.83 0.28
1838
1766
1619
1733
1668
1702
1424
1366
0
500
1000
1500
2000
LB
/AC
RE
nematicide - nematicide
2006 Cotton Yield Following 2005 Crop
peanut corn soybean cotton
0
500
1000
1500
2000
2500
3000
fall 05 spr 06 fall 06
cont cot pnut 1 yr corn 1 yr sybn 1 yrReniform response to 1 yr cotton
0500
100015002000
25003000
fall 05 spr 06 fall 06
cot 05 pnut 05 corn 05 sybn 05
19172612
3131
4006
0
1000
2000
3000
4000
5000
Fall Populations-2006
pnut-cot(N) pnut-cot cot-cot(N) cot-cot
Peanut vs Cotton (+)(-) Nematicide Impact onReniform Populations
525
94
263
87
0
100
200
300
400
500
600n
ema/
100c
c
Fall Populations-2006
cot-corn corn-corn cot-pnut pnut-pnut
2 years versus 1 year non-host crops impact on reniform populations
Reniform Populations following 2 year Crop Rotation
0
1000
2000
3000
4000
fall 05 spr 06 fall 06
Ren
ifo
rm/ 1
00cc
cot-cot pnut-pnut corn-corn sybn-sybn
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).