In recent years, there has been a new change in the law of the occurrence of pear hibiscus, and it is very irregular. The first generation appeared to include the presence of adults, nymphs and eggs. Before the pear blossoms, 10% to 15% of hatched eggs and about 10% of overwintering adults are present. In the critical period of 70% of our traditional pear blossoms, we can also see the new eggs that have fallen just over 10% of the total amount of pears. In addition, the adult period is prolonged. Adults can be seen in the original first generation and second generation. According to the survey, although there has been a new change in the law of occurrence of P. crassifolia, there is still a relatively concentrated period. Overwintering adults are mainly concentrated from late February to early March. The first generation of adults is concentrated from early May to May 15. The first generation eggs are mainly concentrated from mid-March to late March, and the second generation eggs are concentrated in the middle and late May. From the point of view of hazard characteristics, the original pear hibiscus was only used to harm the bagging pears and leaves and leaf clips. Now the pear hibiscus is also endangered in the second nymph larvae hatching period in late May. The secreted mucus interacts with wax paper in the bags. Black mould is formed under high temperature and high humidity conditions, which seriously affects the quality of pear fruit.
According to the new characteristics of the emergence of pear hibiscus, the following measures should be taken in the prevention and treatment of pear hibiscus:
1. Traditional methods for preventing and controlling lime sulfur cannot be abandoned. The use of lime sulfur mixture should be used after the bud begins to expand until the flower buds are exposed, usually 3 to 5 Baume degrees. During use, the use concentration can be adjusted according to the weather temperature and the phenological period. After the pear buds start to expand, 5 Baume degrees lime sulfur agent is generally used. After the flower buds are budded, they are reduced to 3 Baume degrees, and after the inflorescence is separated (that is, several flower buds are seen After flower handle) Stop using it to avoid injury. When the temperature of the spray is high, the temperature must be lowered.
2. Prevention before flowering. Under normal circumstances, the prevention and treatment of pear hibiscus is not used before, but because some nymphs have hatched before flowering, it is difficult to control after flowering. Therefore, it is necessary to increase prevention before flowering. Pre-harvest control must be done before flowering pears. It is best to control the period before the buds see the white petals to the big ball. Use pyrethroids and avermectin drugs.
3. Post-flowering control can be carried out according to the traditional method, that is, when the pear drops 70%, spraying 1.8% Qi Qisu 3000 times.
4. For the flower after the pear pear hibiscus more than 10% or in previous years, pear garden should be sprayed 6 days after the first dose. This is very important. Many fruit growers will no longer check after the first drug, and when they return to the garden after half a month, they have already suffered.
5. The first generation of pear cricket adult control. In the first half of May before bagging, both adult Pear-tree crickets and nymphs of pear crickets occur. Precautionary measures must be taken both before and after bagging, and pyrethroids and avermectin drugs should be used. In the middle of May, it is an adult stage. Chrysanthemum and chlorpyrifos can be used for prevention and treatment.
6. Physical methods to eliminate the first generation of pear aphid eggs. The first generation of pear cricket eggs fell on the shoots of new shoots. From May 19 to 24, most of the shoots were cut off and pulled out of the park for destruction. The fruit growers who produce green pears should pay attention to this technical measure.
7. Strengthen the prevention and treatment of the second generation pear nymphs. In Xinji, from May 28th to June 6th, it was the second generation of nymphs in the hatchery, and the prevention and control could be done by traditional methods. Afterwards, the prevention and treatment of pear hibiscus in each period are basically the same as those in the traditional method and will not be repeated.
The above control dates are the experience of previous years. All localities must formulate corresponding prevention and control measures in light of the actual situation of the occurrence of pear hibiscus.
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