Actualidad nacional e internacionalOct. 21, 2021
Moras: impacto de los daños por heladas primaverales en Arkansas
In the late winter and spring of 2021 we experienced two severe cold events in Arkansas that had the potential to impact fruit crops. The first event was arctic air that moved into the state during the week of February 14th, 2021 where low temperatures of to -20℉ to 0℉ occurred on Feb 16th (Table 1). After the February event we observed symptoms of cold injury and potential crop loss to peaches, blueberry and blackberry across the state. This was a major cold event for us in Arkansas with low temperatures 10-15° F below the low temperatures that are typical for our area and many parts of the state experienced 200+ continuous hours at temperatures below freezing which increases the likelihood for damage.
Unfortunately crops whose floral buds survived the February freeze, were then blooming or setting small fruit during a frost event on April 20th-21st where temperatures dipped into the mid to low 20s F (Table 1).
Major crop reductions to peaches and muscadine occurred in Arkansas during the 2021 season due to these events. Muscadine vines were killed back to the ground in part of the state and fruit loads on peaches in many parts of the state were drastically reduced. Surprisingly blackberry crops in many parts of the state were near normal levels despite the extreme temperatures observed. Blackberry cane damage is expected to occur once temperatures dip below around 0-10F and blooms are damaged below around 27F.
The conditions we experienced in 2021 were expected to result in major reductions in blackberry yields at our University of Arkansas Fruit Research Station, Clarksville (FRS) where lows in Feb achieved -15F and lows in April were 28-30F, however we still had decent crop yields at this location and in locations with similar conditions. Why?
Small fruits newsletter/October 15, 2021