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Table 2.
Number of seedlings of the susceptible variety “Airelle” showing downy mildew symptoms (on a total of 100 infected), and number of Plasmopara halstedii strains of each pathotype collected in the 6 plots after 5 years experimentation.
| Plots |
Total | ||||||
|---|---|---|---|---|---|---|---|
| ReferenceH1 | MixtureH1234 | Alternation | MonocultureH2 | MonocultureH3 | CombinationH4 | ||
| % of susceptible seedlings | 89/100 | 63/100 | 40/100 | 28/100 | 24/100 | 26/100 | 270/600 |
| Number of strains | |||||||
| Pathotype 100 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Pathotype 300 | 0 | 1 | 0 | 1 | 0 | 1 | 3 |
| Pathotype 304 | 0 | 17 | 17 | 3 | 11 | 18 | 66 |
| Pathotype 314 | 0 | 1 | 1 | 1 | 6 | 5 | 14 |
| Pathotype 700 | 9 | 1 | 1 | 0 | 0 | 0 | 11 |
| Pathotype 704 | 0 | 2 | 3 | 0 | 1 | 0 | 6 |
| Pathotype 710 | 41 | 24 | 6 | 9 | 2 | 0 | 82 |
| Pathotype 714 | 0 | 1 | 11 | 13 | 4 | 0 | 29 |
| Total | 50 | 47 | 39 | 27 | 24 | 24 | 211 |
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