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Pinot Noir
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Bunch rot resistance
Bunch rot data is summarized in the next table. In 1987 bunch rot was so severe that essentially only Clevener Mariafeld could be harvested. In 1989 bunch rot was quite severe; on average, there was little bunch rot in 1990, 1991 and 1992. In general, the relative ranking is similar among the columns. This gives us more confidence in the observations made on clones which were not fruiting in 1988 (indicated by question marks in summary rating). Clevener Mariafeld is noted for bunch rot resistance in European tests, and it had lowest bunch rot in our experiments. Gamay Beaujolais also has lower than average incidence of bunch rot. In the past we have recommended that clone because its bunch rot resistance allows harvest to be delayed until full maturity. This means that its wines will sometimes be superior to clones which actually have higher quality potential, but which have to be harvested early to avoid bunch rot. Pinot Meunier is rated as susceptible even though it did not have high amount of bunch rot in 1988. That was because it was harvested early that year as is appropriate for a Champagne variety. Most of the better quality clones are bunch rot susceptible. This re-inforces the idea that, if quality red wine is the goal, then cultural practices which reduce bunch rot must be used so that fruit may be retained on the vine long enough to attain full maturity. The Mariafeld clone has superiour bunch rot resistance, and makes wines which have many desirable attributes. Mariafeld is a good selection to grow in combination with other high quality red wine clones.
| PN Clone |
Bunch Rot 1988 (% by wt) |
Mean Bunch Rot 1991-92 (% by wt) |
Overal Rating | ||
| Mariafeld |
1.9 c |
0 c |
Very Resistant | ||
| Gamay Beaujolais |
9.3 c |
0 c |
Resistant | ||
| Clone 7 |
0 c |
Resistant? | |||
| Clone 2A |
0.2 c |
Resistant? | |||
| Clone 236 |
0.3 c |
Resistant? | |||
| Clone-13 |
0.6 abc |
Moderate | |||
| Espinette |
5.4 c |
0.8 abc |
Moderate | ||
| Pomard |
0.7 abc |
Moderate.? | |||
| Meunier |
13.6 bc |
0.7 abc |
Susceptible. | ||
| Pernand |
26.4 a |
0.7 abc |
Susceptible. | ||
| Canada |
1.6 abc |
Susceptible? | |||
| Clone 29 |
32.2 a |
2.2 abc |
Susceptible | ||
| Geneva |
33.4 a |
2.8 ab |
Susceptible | ||
© Copyright 2000 Robert Pool