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The chilling requirement of a fruit is the minimum period of cold weather after which a fruit-bearing tree will blossom. It is often expressed in chill hours, which can be calculated in different ways, all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures. [1] [2]
When fruit flies were observed under a stressful climate, the survival rate increased in comparison to the fly prior to cold hardening. The diamondback moth. In addition to the common fruit fly, the cold-hardening response of Plutella xylostella (the diamondback moth) also has been widely studied.
If an apple tree, for example, is only in its silver tip bud stage (the first one), temperatures down to 15 degrees will result in a 10% fruit loss. Temperatures down to 2 degrees will result in a ...
Many plants grown in temperate climates require vernalization and must experience a period of low winter temperature to initiate or accelerate the flowering process. This ensures that reproductive development and seed production occurs in spring and winters, rather than in autumn. [3] The needed cold is often expressed in chill hours. Typical ...
Woody plants survive freezing temperatures by suppressing the formation of ice in living cells or by allowing water to freeze in plant parts that are not affected by ice formation. The common mechanism for woody plants to survive down to –40 °C (–40 °F) is supercooling. Woody plants that survive lower temperatures are dehydrating their ...
Citrus species and citrus hybrids typically described as cold-hardy generally display an ability to withstand wintertime temperatures below −5 to −10 °C (23 to 14 °F). Cold- hardy citrus may be generally accepted 'true' species (e.g. Satsuma mandarin , kumquat ) or hybrids (e.g. citrange ) involving various other citrus species.
Growing degrees (GDs) is defined as the number of temperature degrees above a certain threshold base temperature, which varies among crop species. The base temperature is that temperature below which plant growth is zero. GDs are calculated each day as maximum temperature plus the minimum temperature divided by 2, minus the base temperature.
There is a very small spot east of San Juan, Puerto Rico, that includes the airport in coastal Carolina, where the mean minimum is 67 degrees F (19 C), which is classified as hardiness Zone 13b, the highest category, with temperatures rarely below 65 °F (18 °C). The map has a higher resolution than previous editions, and is able to show local ...