Control techniques of pear diseases and insect pests
Precautions: The control technology of "using medicine three times a year" for pear trees only needs to be used three times in normal years in pear orchards with diseases and insect pests such as pear psylla, pear moth, mealybug, ring rot and rust, combined with other physical and biological measures.
For pear orchards with serious diseases, spray 1 every 10 days in years with heavy rainfall. Use two fungicides to prevent the occurrence of late diseases, and orchards with key pests and diseases should be adapted to local conditions.
Postharvest fertilizer must be applied to pear trees in time after fruit picking, so as to speed up the recovery of tree vigor, promote tree vigor, promote the fruiting of mother branches, improve the nutritional level of trees and lay a good foundation for flowering and fruiting in the coming year.
Specific practices: After pear trees are harvested, the dead leaves and weeds in the orchard must be removed in time, and concentrated outside the orchard for deep burial or burning. After harvest, high-quality organic fertilizer and total amount of nitrogen, phosphorus and potassium fertilizer should be given priority to, supplemented by biological fertilizer and phosphorus and potassium fertilizer.
Trees over five years old or trees with fruit weighing more than 50 kg, 25? Each plant should be applied with 10% decomposed human and animal manure. 30 kg, NPK (1 5-15-15), potassium sulfate compound fertilizer1? 1.5 kg, compound biological fertilizer 0.5? 0.75 kg, calcium superphosphate or calcium magnesium phosphate 0.75? 1 kg, potassium sulfate 0.25? 0.5 kg.
Stir all the fertilizers and mix them evenly, and dig 6? Eight are 80 long? 100 cm, width 30? 40 cm, depth 15? In the radiation ditch of 20 cm, the fully mixed fertilizer is evenly scattered in the radiation ditch, covered with soil, and all the fertilizers are covered.