Table 1
Analysis of variance of root weight, number of Meloidogyne arenaria per gram of roots of peanut cultivars Georgia 06G and Tifguard.
| Source of variance | F value |
|---|---|
| Root weight | |
| Cultivar | 2.744e-06 *** |
| Temperature | 0.6528 |
| DAIa | <2.2e-16 *** |
| Cultivar × Temperature | 0.7204 |
| Cultivar × DAI | 1.896e-08 *** |
| Temperature × DAI | 0.8505 |
| Cultivar × Temperature × DAI | 0.7657 |
| M. arenaria per gram of roots Experiment 1 | |
| Cultivar | 0.0009106 *** |
| Temperature | 0.0059029 ** |
| DAI | <2.2e-16 *** |
| Cultivar × Temperature | 0.0374213 * |
| Cultivar × DAI | 0.0005185 *** |
| Temperature × DAI | 4e-07 *** |
| Cultivar × Temperature × DAI | 0.0197020 * |
| M. arenaria per gram of roots Experiment 2 | |
| Cultivar | 6.651e-07 *** |
| Temperature | 0.0001727 *** |
| DAI | <2.2e-16 *** |
| Cultivar × Temperature | 0.0109771 * |
| Cultivar × DAI | 3.001e-09 *** |
| Temperature × DAI | <2.2e-16 *** |
| Cultivar × Temperature × DAI | 6.126e-06 *** |
Figure 1
Mean number of Meloidogyne arenaria in roots of Tifguard and Georgia-06G at 5-day intervals over a 30-day period in Experiment 1.
Figure 2
Mean number of Meloidogyne arenaria in roots of Tifguard and Georgia-06G at 5-day intervals over a 40-day period in Experiment 2.
Figure 3
Number of second-stage juveniles (J2) per gram of root system of the resistant cultivar Tifguard and the susceptible cultivar Georgia-06G 5 days after inoculation in Experiments 1 and 2. Different letters over bars from the same experiment indicate significant differences at P ≤ 0.05.
Figure 4
Number of Meloidogyne arenaria second-stage juveniles (J2) and females 30 days after inoculation (Experiment 1), and J2, females, and egg-laying females 40 days after inoculation (Experiment 2) on Tifguard .
Figure 5
Number of egg-laying females per gram of roots of the resistant cultivar Tifguard and susceptible cultivar Georgia-06G at 30 or 40 days after inoculation in Experiments 1 and 2, respectively. Bars followed by different letters from the same experiment indicate significant differences at P ≤ 0.05.
Figure 6
Mature egg-laying females and necrotic lesions formed around Meloidogyne arenaria infection sites in Tifguard roots. A. Mature females at 35 days after inoculation (DAI) at 34°C; B. Egg-laying female at 40 DAI at 34°C (arrow points to egg mass); C. Arrow points to necrotic lesion at 5 DAI; D. Arrow points to necrotic lesion at 40 DAI.
Figure 7
Number of Meloidogyne arenaria eggs per egg mass from roots of the peanut cultivars Tifguard (resistant) and Georgia-06G (susceptible) at 34°C at 40 days after inoculation. Different letters over bars indicate significant differences at P ≤ 0.05.