Table 2.
Survey of frequency and abundance of five major nematode genera on pecans in Georgia during 2017–2019 by county in two pecan growing ecoregions, Piedmont (P) and Coastal Plain (CP).
| Meloidogyne | Paratrichodorus | Mesocriconema | Helichotylenchus | Xiphinema | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| County | N | PFa | ABb | MDc | PFa | ABb | MDc | PFa | ABb | MDc | PFa | ABb | MDc | PFa | ABb | MDc |
| Clarke (P) | 10 | 80 | 27 | 160 | 10 | 3 | 3 | 30 | 16 | 37 | 30 | 1 | 1 | 20 | 4 | 5 |
| Rockdale (P) | 10 | 10 | 7 | 7 | 20 | 2 | 2 | 80 | 3 | 6 | 100 | 20 | 69 | 70 | 1 | 1 |
| Spalding (P) | 10 | 30 | 24 | 50 | –d | – | – | 40 | 2 | 2 | 100 | 23 | 111 | 30 | 1 | 1 |
| Walton (P) | 30 | 33 | 21 | 124 | 23 | 4 | 10 | 100 | 8 | 31 | 87 | 27 | 97 | 27 | 2 | 3 |
| Appling (CP) | 10 | 90 | 13 | 23 | 80 | 3 | 14 | 100 | 10 | 33 | 10 | 1 | 1 | – | – | – |
| Berrien (CP) | 09 | 44 | 188 | 658 | 22 | 2 | 3 | 56 | 16 | 41 | 11 | 1 | 1 | – | – | – |
| Bibb (CP) | 10 | 20 | 36 | 58 | 100 | 7 | 13 | 100 | 24 | 97 | 100 | 206 | 637 | 50 | 2 | 5 |
| Colquitt (CP) | 07 | 71 | 41 | 83 | 100 | 4 | 9 | 100 | 44 | 89 | 71 | 13 | 25 | 14 | 2 | 2 |
| Cook (CP) | 10 | – | – | – | 50 | 2 | 3 | 100 | 10 | 71 | – | – | – | 10 | 5 | 5 |
| Crisp (CP) | 12 | 58 | 11 | 43 | 58 | 3 | 5 | 83 | 14 | 49 | 58 | 28 | 100 | 42 | 2 | 5 |
| Decatur (CP) | 10 | 70 | 27 | 78 | 20 | 1 | 1 | 90 | 5 | 12 | 10 | 1 | 1 | 60 | 2 | 5 |
| Dougherty (CP) | 10 | 50 | 5 | 11 | 50 | 3 | 5 | 100 | 24 | 45 | 20 | 2 | 2 | 20 | 1 | 1 |
| Grady (CP) | 10 | – | – | – | 20 | 1 | 1 | 90 | 18 | 46 | 60 | 3 | 4 | 40 | 6 | 14 |
| Houston (CP) | 14 | 43 | 14 | 34 | 14 | 2 | 2 | 93 | 54 | 293 | 14 | 16 | 30 | 36 | 3 | 9 |
| Irwin (CP) | 10 | 40 | 38 | 67 | 40 | 2 | 3 | 100 | 49 | 309 | – | – | – | – | – | – |
| Jefferson (CP) | 10 | 70 | 10 | 60 | 70 | 3 | 8 | 90 | 40 | 121 | 10 | 1 | 1 | 40 | 1 | 1 |
| Lee (CP) | 10 | 30 | 2 | 2 | – | – | – | 100 | 11 | 26 | – | – | – | – | – | – |
| Mitchell (CP) | 10 | 40 | 5 | 12 | 70 | 4 | 14 | 90 | 37 | 121 | 50 | 3 | 5 | 10 | 2 | 2 |
| Peach (CP) | 20 | 15 | 35 | 84 | 95 | 10 | 29 | 85 | 18 | 72 | 95 | 27 | 187 | 50 | 2 | 4 |
| Taylor (CP) | 10 | 40 | 1 | 1 | 20 | 3 | 4 | 90 | 6 | 27 | – | – | – | 20 | 3 | 3 |
| Tift (CP) | 10 | 70 | 11 | 36 | 60 | 3 | 3 | 100 | 20 | 49 | – | – | – | – | – | – |
| Turner (CP) | 10 | 30 | 39 | 104 | 10 | 1 | 1 | 100 | 20 | 62 | 40 | 2 | 6 | 90 | 3 | 5 |
| Ware (CP) | 10 | 20 | 3 | 4 | 10 | 1 | 1 | 100 | 11 | 31 | 10 | 1 | 1 | 20 | 2 | 3 |
| Wilcox (CP) | 10 | 70 | 22 | 119 | 30 | 4 | 6 | 90 | 16 | 36 | 10 | 13 | 13 | 10 | 1 | 1 |
| Worth (CP) | 10 | 80 | 18 | 64 | 10 | 1 | 1 | 100 | 28 | 60 | – | – | – | 40 | 2 | 4 |
Notes:aPF = percent frequency‒Total number of samples in which nematode genera was detected divided by the total number of samples collected in that county (N), multiplied by 100 to convert to a percentage. bAB = Abundance‒Sum of nematode densities per 100 cm3 soil divided by the total number of samples in which the nematode genus was detected in the county on either survey date. cMD = Maximum density of each genera detected per 100 cm3 soil. dDashes indicate the absence of specific nematode genera.