Table 1.
Summary of microplot and field trials conducted to determine the pathogenicity of Globodera ellingtonae on potato (Solanum tuberosum).
| Name | Year | Cultivar | Initial nematode density (eggs/g soil) evaluated |
|---|---|---|---|
| Microplot 1a | 2017 | Russet Burbank | 0, 6, 12, 26, 52, 104, 169 |
| Microplot 2 | 2017 | Russet Burbank | 0, 6, 12, 26, 52, 104, 169 |
| Trial 1b | 2013 | Russet Burbank | 0, 10, 20, 40, 80 |
| Trial 2 | 2013 | Désirée | 0, 10, 20, 40, 80 |
| Trial 3 | 2014 | Russet Burbank | 0, 10, 20, 40, 80 |
| Trial 4 | 2014 | Various varieties | 0, 80 |
| Trial 5 | 2015 | Ranger Russet | 0, 40, 80, 160, 320 |
Figure 1:
Impact of initial egg density (Pi) of Globodera ellingtonae on yield of potato (Solanum tuberosum) cv. Russet Burbank grown in microplots. A linear model of the relationship between G. ellingtonae log10 (P i + 1) and tuber yield was determined.
Table 2.
Reproduction of Globodera ellingtonae inoculated at varying initial population densities (Pi) on potato (Solanum tuberosum) cv. Russet Burbank in microplots.
| Pi a | Pf b | Eggs/cyst | RFc |
|---|---|---|---|
| 6 | 110 cd | 165 ab | 18.3 a |
| 13 | 189 bc | 200 a | 14.5 ab |
| 26 | 269 ab | 162 ab | 10.3 bc |
| 52 | 308 ab | 140 ab | 5.9 cd |
| 104 | 376 ab | 134 b | 3.6 cd |
| 169 | 410 a | 144 ab | 2.4 d |
| P-value | ≤ 0.001 | 0.045 | ≤ 0.001 |
1 aInitial population densities (Pi) are eggs/g soil; bfinal population densities (Pf) are eggs/g soil; cRF = final egg density/initial egg density; dvalues are means of 12 observations. Means within a column followed by the same letter are not different according to Tukey’s honestly significant difference test (P ≤ 0.05).
Table 3.
Yield of potato cultivars inoculated (80 eggs/g soil) or not (0 eggs/g soil) with Globodera ellingtonae and reproductive outcomes of G. ellingtonae when inoculated at an initial population density of 80 eggs/g soil at Powell Butte, Oregon.
| Potato yield (g) | |||||
|---|---|---|---|---|---|
| Cultivar (Trial) | 0 eggs/g soil | 80 eggs/g soil | Pf a | Eggs/cyst | RFb |
| Russet Burbank (Trial 1) | 1,878c | 1,063*d | 194 | 119 | 1.6 |
| Désireé (Trial 2) | 2,329 | 1,781 | 230 | 229 | 3.3 |
| Russet Burbank (Trial 3) | 2,677 | 2,516 | 292 be | 331 b | 3.7 b |
| Alturas (Trial 4) | 3,071 | 3,178 | 103 a | 198 a | 1.3 a |
| Ranger Russet (Trial 4) | 2,610 | 2,428 | 122 ab | 203 a | 1.5 ab |
| Russet Norkotah (Trial 4) | 1,777 | 1,691 | 127 ab | 200 a | 1.6 ab |
| Umatilla Russet (Trial 4) | 2,494 | 2,760 | 97 a | 157 a | 1.2 a |
| Yukon Gold (Trial 4) | 1,257 | 1,560 | 40 a | 170 a | 0.5 a |
| Ranger Russet (Trial 5) | 2,701 | 2,181* | 195 | 220 | 2.4 |
1 aFinal population densities (Pf) are eggs/g soil; bRF = final egg density/initial egg density; cvalues are the mean of seven observations; d*denotes a significant difference in yield of inoculated (80 eggs/g soil) compared to non-inoculated (0 eggs/g soil) plants (P < 0.01); emeans in a column followed by the same letter for Trials 3 and 4 are not significantly different according to Tukey’s honestly significant difference test (P < 0.05).
Figure 2:
Impact of initial egg density (Pi) of Globodera ellingtonae on per plant tuber yield of potato (Solanum tuberosum) cvs. Russet Burbank, Ranger Russet, and Désirée during three years of field experiments. Separate linear models of the relationship between G. ellingtonae log10 (P i + 1) and tuber yield were determined for each trial.
Table 4.
Reproduction of Globodera ellingtonae inoculated at varying initial population densities (Pi ) on potato (Solanum tuberosum) cultivars grown in field experiments at Powell Butte, Oregon.
| Russet Burbank (Trial 1) | Désireé (Trial 2) | Russet Burbank (Trial 3) | Ranger Russet (Trial 5) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pf b | Eggs/cyst | RFc | Pf | Eggs/cyst | RF | Pf | Eggs/cyst | RF | Pf | Eggs/cyst | RF | |
| 10 | 132 abd | 287 ab | 13.2 a | 197 | 289 | 19.8 a | 50 b | 343 | 5.0 | |||
| 20 | 274 a | 374 a | 13.7 a | 213 | 267 | 10.7 ab | 67 b | 244 | 3.4 | |||
| 40 | 294 ab | 281 ab | 7.3 a | 330 | 247 | 8.3 b | 283 a | 313 | 7.1 | 159 | 273 a | 4.0 a |
| 80 | 119 b | 195 b | 1.5 b | 230 | 229 | 2.8 c | 292 a | 331 | 3.7 | 195 | 220 ab | 2.4 a |
| 160 | 169 | 201 ab | 1.1 b | |||||||||
| 320 | 209 | 167 b | 0.7 b | |||||||||
| P-value | 0.009 | 0.03 | <0.001 | 0.10 | 0.23 | <0.001 | <0.001 | 0.20 | 0.21 | 0.62 | 0.008 | <0.001 |
1 aInitial population densities (Pi) are eggs/g soil; bfinal population densities (Pf) are eggs/g soil; cRF=final egg density/initial egg density; d values are means of six observations. Means within a column followed by the same letter are not different according to Tukey’s honestly significant difference test (P ≤ 0.05).