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Lisa Myers1, Koon-Hui Wang2*, Robert McSorley2, and Carlene Chase3 - page 10 / 10

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26th Southern Conservation Tillage Conference

Pigweed

208.3 a

34.8 c

7.17 a

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Purple nutsedge RM§

226.3 a

95.0 a

1.67 ab

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Purple nutsedge (mulch)

237.5 a

56.2 b

1.17 b

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Lambsquarters

97.3 bc

110.8 a

6.33 ab

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Signalgrass

40.0 c

78.7 a

4.67 a

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Table 2. Nematode population densities on weeds and cover crops at four sites in Florida.

73.7 a

0.17 b

11.5 b

1.50 ab

3.2 c

1.33 ab

19.7 ab

5.17 a

Plant Science Field Teaching Laboratory. Data are untransformed arithmetic means of three replications. At each location, means in columns with the same letters are not significantly different (P0.05), according to Duncan’s new multiple-range test performed on log-transformed data. RM = unmulched row middles. Plant Science Research and Education Center. §

Plant host PSTFLVirginia pepperweed Volunteer cowpea Rosie’s Organic Farm

Sting

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PSREUPigweed Purple nutsedge Hairy indigo Crabgrass

Hammock Hollow Farm

Stubby-root

Lesion

Lance

---

29.0 a

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8.2 b

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12.0 a

50.7 a

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4.8 a

1.5 a

0.8 a

18.7 a

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4.7 a

0.2 b

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Pigweed Millet co

ver crop

    • 0.3

      a

    • 1.2

      a

    • 0.2

      a

    • 0.5

      a

Nematodes per 100 cm3 soil

Root-knot

Ring

  • ---

    6.5 a

  • ---

    6.5 a

Yellow nutsedge

0c

25.4 bc

1,082.4 bcd

1.2 b

Purple nutsedge

0c

2.3 c

260.2 bc

0.0 b

Florida pusley

0c

4.1 bc

78.2 cde

1.8 b

Bermudagrass

1.0 c

5.3 bc

565.9 b

0.0 b

Johnsongrass

0c

0.3 c

90.6 cde

0.0 b

Velvetbean

0c

0.2 c

4.7 de

0.0 b

Plant tested

Root gall

Nematodes

Nematodes

Nematodes

rating

per g fresh root wt

per root system

per 100 cm3 soil

American black

nightshade I C Cowpea Virginia pepperweed

3.2 b 0.2 c 0c

Pepper

4.5 a

Table 3. Root-knot nematode galling and population levels in roots and soil in greenhouse test.

42.6 b 0.0 c 0.1 c

532.6 b 0.0 e 0.2 e

2.2 b 0.5 b 0.0 b

323.7 a

11,576.4 a

86.8 a

  • Root galling rated on 0 to 5 scale, where 0 = 0 galls, 1 =1-2, 2 = 3-10, 3 = 11-30, 4 = 31-100, 5 = >100 galls per root

system (Taylor and Sasser, 1978).

  • Data are untransformed arithmetic means of 4 replications. Means in columns followed by the same letter do not differ

(P 0.05) according to Duncan’s new multiple-range test performed on log-transformed data.

265

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