Table 3.
Frequency of occurrence and abundance of plant-parasitic nematodes in commercial pecan orchards from two ecoregions of Georgia, 2017–2019.
| Coastal Plain region | Piedmont region | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean percentages of 6 soil samples | Mean percentages of 4 soil samples | |||||||||||||||
| Nematode genus | PFa | ABNb | STD | MDc | Sand | Silt | Clay | pH | PFa | ABNb | STD | MDc | Sand | Silt | Clay | pH |
| Heterodera | 2 | 35 | 9.3 | 138 | 87.5 | 5.92 | 6.56 | 6.6 | 3 | 4 | 0.7 | 5 | 65.5 | 17.25 | 17.28 | 5.45 |
| Xiphinema | 28 | 3 | 1.6 | 14 | 87.5 | 5.92 | 6.56 | 6.6 | 33 | 2 | 1.0 | 5 | 65.5 | 17.25 | 17.28 | 5.45 |
| Hoplolaimus | 7 | 4 | 1.5 | 15 | 87.5 | 5.92 | 6.56 | 6.6 | 3 | 2 | 0.4 | 2 | 65.5 | 17.25 | 17.28 | 5.45 |
| Pratylenchus | 1 | 1 | 0.1 | 1 | 87.5 | 5.92 | 6.56 | 6.6 | 13 | 4 | 1.5 | 7 | 65.5 | 17.25 | 17.28 | 5.45 |
| Paratylenchus | 1 | 6 | 2.9 | 42 | 87.5 | 5.92 | 6.56 | 6.6 | 3 | 4 | 0.7 | 5 | 65.5 | 17.25 | 17.28 | 5.45 |
| Mesocriconema | 93 | 23 | 35.2 | 309 | 87.5 | 5.92 | 6.56 | 6.6 | 75 | 7 | 7.2 | 37 | 65.5 | 17.25 | 17.28 | 5.45 |
| Meloidogyne | 44 | 25 | 47.6 | 658 | 87.5 | 5.92 | 6.56 | 6.6 | 37 | 23 | 27.0 | 160 | 65.5 | 17.25 | 17.28 | 5.45 |
| Hemicycliophora | 1 | 1 | 0.1 | 1 | 87.5 | 5.92 | 6.56 | 6.6 | 15 | 3 | 1.3 | 6 | 65.5 | 17.25 | 17.28 | 5.45 |
| Helichotylenchus | 30 | 44 | 58.6 | 637 | 87.5 | 5.92 | 6.56 | 6.6 | 82 | 23 | 27.7 | 111 | 65.5 | 17.25 | 17.28 | 5.45 |
| Paratrichodorus | 46 | 5 | 4.2 | 29 | 87.5 | 5.92 | 6.56 | 6.6 | 17 | 3 | 1.6 | 10 | 65.5 | 17.25 | 17.28 | 5.45 |
| Tylenchorhynchus | 4 | 23 | 11.1 | 164 | 87.5 | 5.92 | 6.56 | 6.6 | 8 | 2 | 0.9 | 6 | 65.5 | 17.25 | 17.28 | 5.45 |
Notes:aPF (Percent frequency) = Percent of total samples with species present, N = 222 and 60 samples from Coastal Plain and Piedmont regions, respectively. bABN (Abundance) = Sum of nematode densities per 100 cm3 soil divided by the total number of samples in which the nematode genus was detected. cMD (Maximum density) = Maximum count observed in 100 cm3 soil samples. Minimum was zero for all species. STD = standard deviation.