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Nematode Management Investigations in Mississippi, 1997


Table 11. Effect of Temik 15G on the number of nodes produced and the first fruiting node on Sure Grow 125 cotton in a field infested with the root-knot nematode.1
Treatment2 Rate
per acre3		 Application
method		 Nodes
per plant		 Node of first
fruiting branch
Control -- -- 27.23 a 9.00 a
Temik 15G 3.5 lb In-furrow 21.53 a 6.00 b
Temik 15G 5 lb In-furrow 21.86 a 5.80 b
Temik 15G 7 lb In-furrow 21.43 a 6.13 b
Temik 15G +
  Temik 15G		 5 lb +
  5 lb		 In-furrow +
  sidedress		 21.73 a 6.86 b
Temik 15G +
  Temik 15G		 5 lb +
  10 lb		 In-furrow +
  sidedress		 21.23 a 6.00 b
Gaucho 4 oz ai/cwt Seed treatment 20.66 a 7.26 ab

LSD (P=0.05)
6.67 1.74
1Data are means of five replications. Means were compared using the least significant difference test.
2Temik 15G sidedress treatments were applied at the 9 to 10 growth stage on July 1, 1997.
3Rates were calculated based on 38-inch row spacing.



Table 12. Effect of Temik 15G on the yield of Sure Grow 125 cotton in a field infested with the root-knot nematode.1
Treatment2 Rate
per acre3		 Application
method		 Seed
Cotton		 Seed
Cotton		 Yield
over control

lb/plot lb/A lb/A
Control -- -- 11.88 c 1,941.8 c --
Temik 15G 3.5 lb In-furrow 17.54 ab 2,867.0 ab 925.2
Temik 15G 5 lb In-furrow 18.09 ab 2,957.1 ab 1,015.3
Temik 15G 7 lb In-furrow 16.25 b 2,656.2 b 714.4
Temik 15G +
  Temik 15G		 5 lb +
  5 lb		 In-furrow +
  sidedress		 20.31 a 3,319.9 a 1,378.1
Temik 15G +
  Temik 15G		 5 lb +
  10 lb		 In-furrow +
  sidedress		 17.07 ab 2,790.6 ab 848.8
Gaucho 4 oz ai/cwt Seed treatment 11.77 c 1,924.8 c -17.0

LSD (P=0.05)
3.48 569.5
1Data are means of five replications. Means were compared using the least significant difference test.
2Temik 15G sidedress treatments were applied at the 9 to 10 growth stage on July 1, 1997.
3Rates were calculated based on 38-inch row spacing.



Table 13. Effect of Temik 15G on plant survival and height of DPL-20 cotton in a field infested with the root-knot nematode. 1
Treatment Rate
per acre2		 Application
method		 Seedling
stand3
Control -- -- 121 a
Temik 15G 3.5 lb In-furrow 129 a
Temik 15G 5 lb In-furrow   93 b
Temik 15 G 7 lb In-furrow 112 ab
Gaucho 4 oz ai/cwt Seed treatment   90 b
LSD (P=0.05)
22
1Data are means of five replications. Means were compared using the least significant difference test.
2Rate calculated based on 38-inch row spacing.
3Number of live plants per 40 feet of row; all rows received 210 seed.



Table 14. Effect of Temik 15G on the yield of DPL 20 cotton in a field infested with the root-knot nematode.1
Treatment2 Rate
per acre3		 Application
method		 Seed
Cotton		 Seed
Cotton		 Yield increase
over control

lb/plot lb/A lb/A
Control -- --   6.73 c 1,099.9 c --
Temik 15G 3.5 lb In-furrow 13.89 a 2,271.6 a 1,171.1  
Temik 15G 5 lb In-furrow 12.76 a 2,085.7 a 985.8
Temik 15G 7 lb In-furrow   11.48 ab   1,877.7 ab 777.8
Gaucho 4 oz ai/cwt Seed treatment 8.49   1,387.6 bc 287.7

LSD (P=0.05)
3.29 537.8
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.



Table 15. Effect of Di-Terra on population development of the root-knot nematode on Sure Grow 125 cotton.1
Treatment Rate
per acre 3		 Application
method 		M. incognita / 250 cm3soil at 0-144 days after planting
0 36 67
Di-Terra 25 lb In-furrow 521.4 a 738.2 a 257.5 ab
Di-Terra 50 lb In-furrow 334.8 ab 403.4 b 137.3 b
Di-Terra 75 lb In-furrow 289.7 ab 343.3 b 154.5 b
Temik 15G 5 lb In-furrow 263.9 b 386.3 b 266.1 ab
Di-Syston 8EC 1 lb ai In-furrow 251.1 b 300.4 b 231.8 ab
Control -- -- 231.8 b 334.8 b 377.7 a

LSD (P=0.05)
253 232 207
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.
3Average root-knot nematode population density across all sample dates.
4R f= (nematode population at harvest/nematode population at planting).


Table 15. Continued.

Table 15. Effect of Di-Terra on population development of the root-knot nematode on Sure Grow 125 cotton.1
Treatment Rate
per acre3		 Application
method		 M. incognita / 250 cm3 soil at 0-144 days after planting Rf 4
103 144 Mean3
Di-Terra 25 lb In-furrow 1,158.7 ab 961.3 a 727.4 a 0.49 a
Di-Terra 50 lb In-furrow 738.2 b 1,330.4 a 588.8 a 0.31 ab
Di-Terra 75 lb In-furrow 1,278.9 ab 1,579.3 a 729.1 a 0.25 b
Temik 15G 5 lb In-furrow 1,725.2 a 1,587.9 a 845.9 a 0.17 b
Di-Syston 8EC 1 lb ai In-furrow 1,193.1 ab 1,708.1 a 736.9 a 0.24 b
Control -- -- 978.5 ab 1,484.9 a 681.5 a 0.17 b

LSD (P=0.05)
915 911 287 0.24
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.
3Average root-knot nematode population density across all sample dates.
4R f= (nematode population at harvest/nematode population at planting).



Table 16. Effect of Di-Terra on plant survival and the height of Sure Grow 125 cotton in a field infested with the root-knot nematode. 1
Treatment Rate
per acre2		 Application
method		 Seeding
stand3		 Plant
height4		 Increase over
control

in in
Di-Terra 25 lb In-furrow 142 c 36.7 bc -0.5
Di-Terra 50 lb In-furrow 129 c 34.6 c   -2.6
Di-Terra 75 lb In-furrow 134 c 38.6 ab 1.4
Temik 15G 5 lb In-furrow 166 b 40.1 a   2.9
Di-Syston 8EC 1 lb ai In-furrow 188 a 36.3 bc 0.6
Control -- --   175 ab 37.2 b   --

LSD (P=0.05)
15.9 2.6
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.
3Number of live plants per 40 feet of row; all rows received 210 seed.
4Plant height recorded on August 4, 1997.



Table 17. Effect of Di-Terra on the yield of Sure Grow 125 cotton in a field infested with the root-knot nematode.1
Treatment Rate
per acre2		 Application
method		 Seed
cotton		 Seed
cotton		 Yield
over control

lb/plot lb/A lb/A
Di-Terra 25 lb In-furrow 14.44 c   2,360.1 c   570.4
Di-Terra 50 lb In-furrow 14.55 bc 2,379.0 bc 592.3
Di-Terra 75 lb In-furrow 18.10 a   2,959.7 a   1,173.0  
Temik 15G 5 lb In-furrow 18.06 ab 2,952.0 ab 1,165.3  
Di-Syston 8EC 1 lb ai In-furrow 14.24 cd 2,327.4 dc 540.7
Control -- -- 10.93 d   1,786.7 d   --

LSD (P=0.05)
3.51    573.26  
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.



Table 18. Effect of ACT on population development of the root-knot nematode on Sure Grow 125 cotton.1
Treatment Rate
per acre 2		 Application
method 		M. incognita / 250 cm3soil at 0-144 days after planting
0 36 67
ACT 2 oz In-furrow 270.4 a 523.6 a 326.2 a
Temik 15G 5 lb In-furrow 263.9 a 386.3 a 266.1 a
Di-Syston 8EC 1 lb ai In-furrow 251.1 a 300.4 a 231.8 a
Control -- -- 231.8 a 334.8 a 377.7 a

LSD (P=0.05)
148 230 413
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.
3Average root-knot nematode population density across all sample dates.
4R f= (nematode population at harvest/nematode population at planting).


Table 18. Continued.

Table 18. Effect of ACT on population development of the root-knot nematode on Sure Grow 125 cotton.1
Treatment Rate
per acre3		 Application
method		 M. incognita / 250 cm3 soil at 0-144 days after planting Rf 4
103 144 Mean3
ACT 2 oz In-furrow 1,038.6 a 1,055.7 a 642.9 a 0.28 a
Temik 15G 5 lb In-furrow 1,725.2 a 1,587.9 a 845.9 a 0.17 a
Di-Syston 8EC 1 lb ai In-furrow 1,193.1 a 1,708.1 a 736.9 a 0.24 a
Control -- --   978.5 a 1,484.9 a 681.5 a 0.17 a

LSD (P=0.05)
1,145 955 285 0.17
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.
3Average root-knot nematode population density across all sample dates.
4Rf= (nematode population at harvest/nematode population at planting).



Table 19. Effect of ACT on plant survival and height of Sure Grow 125 cotton in a field infested with the root-knot nematode.1
Treatment Rate
per acre2		 Application
method		 Seeding
stand3		 Plant
height4		 Plant height
over control

in in
ACT 2 oz In-furrow 163 b 34.1 c   -3.1
Temik 15G 5 lb In-furrow 166 b 40.1 a    2.9
Di-Syston 8EC 1 lb ai In-furrow 189 a 36.6 bc -0.6
Control -- --   175 ab 37.2 ab --

LSD (P=0.05)
17.8 2.9
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.
3Number of live plants per 40 feet of row; all rows received 210 seed.
4Plant height was measured on August 1, 1997.



Table 20. Effect of ACT on the yield of Sure Grow 125 cotton in a field infested with the root-knot nematode.1
Treatment Rate
per acre2		 Application
method		 Seed
cotton		 Seed
cotton		 Yield increase
over control

lb/plot lb/A lb/A
ACT 2 oz In-furrow 13.23 b 2,163.2 b 377.2
Temik 15G 5 lb In-furrow 18.06 a 2,952.0 a 1,166.0   
Di-Syston 8EC 1 lb ai In-furrow   14.24 ab   2,327.4 ab 541.4
Control -- -- 10.93 b 1,786.0 b --

LSD (P=0.05)
4.16 680.37
1Data are means of five replications. Means were compared using the least significant difference test.
2Rates were calculated based on 38-inch row spacing.


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