County Agent’s Corner

2010-01-17 / Business

Freezing temperatures causing concerns for citrus trees
By John Ford, CEA-Ag Texas AgriLife Extension Service

Hopefully, the cold weather experienced in the Kingsville area the past several weeks will be the last of the low temperatures and chilly conditions for the winter season.

However, that is probably wishful thinking, and South Texas will likely see a few more days with temperatures dipping to the freezing mark.

Numerous calls and questions were received last week from residents concerned about their citrus trees.

The duration of freezing temperatures can be more critical than the minimum temperature.

A brief drop to 24 degrees F may not cause as much damage as several hours at 26 degrees F.

When preparing for freezing weather, the soil under and around the citrus tree should be bare and firm as possible in a landscape setting.

Remove mulches and thoroughly irrigate the citrus trees and surrounding areas several days before a hard freeze is anticipated.

Bare ground can absorb more heat from the sun than can soil covered by weeds, grass and mulch.

Moist soil can absorb more heat and conduct heat better than dry soil. Therefore, before a freeze is expected, irrigate bare ground.

It will absorb, store, conduct and release more heat to the tree during the time that the temperature drops into the freezing range.

The tops of citrus trees may be draped with blankets and quilts for further protection.

It is not necessary to encase the tree completely, in fact tenting or draping actually holds more heat around the tree.

May sure that the covering is securely anchored the afternoon before the freeze.

Additional heat can be provided and is very effective in combination with covers, particularly if the cover does not completely encase the tree.

Incandescent lights in the tree can generate considerable heat.

However, when utilizing any electrical equipment outdoors exercise extreme caution especially since most South Texas freezes begin with strong north winds and often include precipitation.

Knowing what to do and being prepared will insure that fresh home grown citrus is available regardless of a few days of freezing weather.

Return to top