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梨树花期对温度条件的要求,因品种和物候期而不同。一般说来,开花和花粉发芽,要求有10℃以上的气温。气温在14℃以上时,开花较快;气温在24℃左右时,花粉管伸长最快;温度在4～5℃时,花粉管即易受冻。据观察,莱阳茌梨显蕾期遇有-5℃的低温,花序分离期遇有-3.5℃的低温,开花当天遇有-1.5℃的低温时,都会使花器官发生冻害。鸭梨花期的耐寒力比茌梨强,在相应的开花物候期中,鸭梨花器官受冻的临界温度,分别比茌梨要低0.3～0.5℃。
Pear tree flowering temperature requirements, due to different species and phenology. In general, flowering and pollen germination require temperatures above 10 ° C. When the temperature is above 14 ℃, the flowering is faster; when the temperature is about 24 ℃, the pollen tube elongates the fastest; when the temperature is between 4 and 5 ℃, the pollen tube is susceptible to freezing. It is observed that Laiyang pear pear buds in the event of a low temperature of -5 ℃, inflorescence separation encountered -3.5 ℃ low temperature, the day when the flowering encountered -1.5 ℃ low temperature, will make the flower organ freeze injury. The resistance to drought in flowering pear was stronger than that in pear. In the corresponding flowering phenophase, the critical temperature of freezing of organs of pear and pear was 0.3 ~ 0.5 ℃ lower than that of pear.