Longan Spike "Pulsation Tip" is exactly called the spiked spike. The development of longan spikes is affected by changes in the internal and external conditions, so that the development of flower spikes ceases, branches and leaves are formed, and spikes with leaves are formed. In severe cases, the entire spikelets become vegetative shoots. Spike spikes are a major cause of late harvest of longan in Jiaocheng. When the longan earing encounters a weather with a temperature of 3 to 5 degrees Celsius that is higher than 18 degrees Celsius, it is prone to “shootingâ€. When a large number of spikes “shooting†take place, artificial picking leaves, ethephon spray, etc. are used. The measures will have little effect. For longan spikes “shootingâ€, precautions should be taken in advance, and there are three measures: First, when the flower ear is developed as a lotus seat, spray 200 mg liter (50 kg water plus 40% ethephon can effectively prevent flower spikes “shooting†Spraying should be carried out when the temperature on sunny days is higher than 20 degrees Celsius, spray only on the outside of the tree crown, and spray on the top buds of wet flower flowers, which can't be repeated and sprayed. Longan is sensitive to ethephon, and the use of too high concentration or too much amount can easily lead to Yellow leaf, deciduous, tree vigor decline; Second, when the spike spindle is about 5cm in length, spray 400 times cytokinin, which can promote the rapid development of flower spikes, and also can prevent flower spike "shooting"; third, flower spike " When exposed to red with 30 pounds of paclobutrazol plus 7-10 ml of ethephon, attention should be paid when the temperature is higher than 23 degrees, and spray can not be repeated.
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