Jeff Franklin is sharing with us the main observations of the season until June 21 in terms of temperature. Always good to remember, this information is coming from Kentville Research Development Centre (KRDC), therefore, difference between locations are possible to be found. The biggest milestone from last week is the first flowers started to bloom, more specifically early cultivars such as Baco noir, Marquette and Frontenac.
The first table shows the temperature base 5⁰ C and base 10⁰ C from 2018 until 2021 accumulated each year from March 1 until June 21.
At the end of each section, it’s possible to see the average of the last 5 and
10 years respectively.
|
Category |
2018 |
2019 |
2020 |
2021 |
5 year average |
10 year average |
|
Plant development
(Base 5ºC) |
490.9 |
451.7 |
492.0 |
599.0 |
502.5 |
518.6 |
|
Insect development
(Base 10º) |
231.5 |
187.5 |
244.8 |
296.2 |
234.4 |
243.1 |
Figure 1. Degree day accumulations as of June 21,
2021. All data are taken from the Kentville
weather station, based on a start date of March 1, and calculated using the
single sine method.
The degree accumulation continues as the highest in the last
3 growing seasons, which has impacted positively in grapevine growth. Based on
10⁰
C, 2021 has 296.2 which is above the average temperature of the last 5 and 10
years with 234.4 and 243.1 respectively.
In the following
column graph, it’s possible to see the values from 2004 until 2021 and at the
end you can see the average of the last 5 and 10 years respectively.
Figure 2. Degree day accumulations as of June 21,
2021 base 10⁰ C.
All data are taken from the Kentville weather station, based on a start
date of March 1, and calculated using the single sine method.
This graph highlights the difference with the last 3 years
and shows differences between 2021 with 2017. Last week it was highlighted that
in previous publications we observed similarities and even higher accumulations
in 2010 and 2012. However, according to this data 2021 until now has
accumulated even more than 2010 and quite similar to 2012. This increase has
impacted in the acceleration of grape growth and phenology, which can be
appreciated with the beginning of bloom in the earliest hybrid cultivars like
Baco noir and Frontenac. In the case of Vitis vinifera varieties this
stage can vary depending on the location and the variety.
The following photos show some varieties in the last couple
of days.
Figure 3. On the left Castel last week and on the
right Frontenac gris at the end of last week.
Figure 4. On the left Pinot noir and on the right
Riesling, both from last week.
Figure 5. On the left Frontenac gris and on the right
Baco noir, both from last weekend.