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Posted by
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Satsumas and upcoming freeze
Posted by AlxTgr on 11/9/19 at 8:19 am00
As of today, the low Tuesday is 23. My fruit is not quite there yet. First, should I pick it all Monday? Second, do I need to protect the tree? This is my first winter in this house.
From an article “When and How to Protect Citrus From Winter’s Cold” by Dan Gill retired extension hortiiculturist, LSU AgCenter
quote:
All ripe fruit should be harvested from trees prior to a significant freeze event. Temperatures cold enough to damage the tree will also ruin the fruit. It takes temperatures in the mid- to low 20s five to 10 hours to freeze the fruit.
Three factors which are basically involved in determining freeze susceptibility of citrus trees are:
1) The type and age of the citrus. Satsumas are the most cold hardy of the commonly grown citrus species in Louisiana. Kumquats follow with just a slight less amount of cold hardiness. In order from most cold hardy to least cold hardy: satsuma, kumquat, orange, grapefruit, lemon and lime. A citrus tree increases in hardiness as it gets older. Trees with larger, denser canopies deal with the cold better as they trap more heat.
2) Threshold temperatures are approximately 20 degrees for satsumas and kumquats, and about 26 degrees for all other citrus.
3) The duration of the sub-freezing temperature is very significant. If the temperature is below freezing for 24 to 36 hours, damage can usually be expected.
Generally, when freeze injury occurs, damage is inflicted mostly to cell membranes by freezing and thawing. The least cold hardy tissues of citrus trees are new buds, flowers, and small fruit. The more cold hardy part of the tree is the mature wood of major branches and the trunk.
This post was edited on 11/9 at 8:29 am
Sounds like the tree will be OK, particularly if the satsuma tree is several years old. The fruit - ???? Just be aware that un-ripe citrus fruit will not continue to ripen after being picked from the tree as many other fruits will.
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In Baldwin County, AL we have sprayed the plants and fruit with water right before the freeze so the water freezes over them and that has worked. We have failed in the pasty by covering with a plastic sheet then in the day when the temp rises, the plant burns up.
quote:Is this good enough for the fruit too?
make a crude frame around it,then completely cover with plastic from bottom to top, then place a drop light inside it and the light bulb keeps the temps inside the plastic above freezing
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