Table 3.
Comparison of the degree of galling and reproduction rate of Meloidogyne floridensis and M. arenaria isolates on peach cvs. Flordaguard, Okinawa, and Lovell after 5 month’s growth under greenhouse conditions.
| Cultivara | Isolate | GIb | EMIb | EGFRc | RFc |
|---|---|---|---|---|---|
| Flordaguard | Mf1 | 0 | 0.0 | 0 | 0.0 |
| Mf2 | 0 | 0.0 | 0 | 0.0 | |
| Mf4 | 0 | 0.0 | 0 | 0.0 | |
| Ma1 | 2.9 | 3.5 | 377 | 3.6 | |
| Ma2 | 5.0 | 5.0 | 259 | 3.4 | |
| Okinawa | Mf1 | 0.0 | 0.0 | 0 | 0.0 |
| Mf2 | 0.0 | 0.0 | 0 | 0.0 | |
| Mf4 | 0.0 | 0.0 | 0 | 0.0 | |
| Ma1 | 2.6 | 0.0 | 0 | 0.0 | |
| Lovell | Mf1 | 5.0 | 5.0 | 1,244 | 11.8 |
| Mf2 | 5.0 | 5.0 | 1,604 | 18.0 | |
| Mf4 | 5.0 | 5.0 | 1,691 | 14.5 | |
| Ma1 | 5.0 | 5.0 | 1,485 | 18.0 | |
| Tomato | Mf1 | 5.0 | 5.0 | 5,932 | 42.3 |
| cv. Agriset 334 | Mf2 | 5.0 | 5.0 | 7,548 | 62.7 |
| Mf4 | 5.0 | 5.0 | 8,915 | 59.1 | |
| Ma1 | 5.0 | 5.0 | 8,742 | 42.4 |
Notes: aFour month-old peach seedlings were inoculated with 10,000 eggs/plant. Peach rootstock cv. Lovell used as a susceptible control and tomato cv. Agriset 334 included to check nematode viability. bGalling (GI) and egg mass indices (EMI) were based on a 0 to 5 scale where 0 = no galls or egg masses, 1 = 1-2, 2 = 3-10, 3 = 11-30, 4 = 31-100, 5 = ≥ 100 galls or egg masses per plant (Taylor and Sasser, 1978). Data were subjected to log10 (x + 1) transformation before analysis of variance. Data are non-transformed means of seven replicates. cEGFR = Eggs per gram of fresh root. Reproduction factor (RF) = ratio of nematode eggs at 5 months after inoculation to initial inoculum concentration of 10,000 eggs (Sasser et al., 1984). EGFR and RF data were subjected to arcsine and fourth-root transformation, respectively, before analysis of variance. Data are non-transformed means of seven replicates.