According to the principle of pest control in fruit trees and the biological habits of P. edulis, there are two key stages in the chemical control of this insect: one is the adult puerperium excretion period, usually in the middle or late March, and some years can be found in February. Adults, the prevention and control should be the most favorable period for prevention and control, but because some orchards do not pay enough attention, they will miss this prevention and control; the other is the first generation of egg hatching, when the adult worms die after wintering, the first hatching nymphs Has not yet secreted honey dew, insects more single, help control.
In general, the temperature in the spring is undulating, and the arrival of the egg's incubation period depends on how quickly the temperature rises. Observing the growth of first-generation egg hatching through orchard practice shows a certain correlation with the phenology of spring fruit trees. Generally 80% - 90% of pears fall, the first generation of eggs hatches to the peak, and the first hatching nymphs in the field are the main forms of infestation. At this time, the leaves of the pear tree have not yet grown up, so it is easy to control the pesticide and reduce the dosage. Therefore, it is said that the loss of pear trees and the prevention of rafts are particularly effective and should not be missed.
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