The Timing of Pesticide Application on Fruit Trees
Scientifically mastering the timing of pesticide application on fruit trees is a key link to improve fruit yield and quality. There are significant differences in the demand for pesticides at different growth stages, and accurately grasping the timing of application can effectively control pests and diseases while avoiding the occurrence of phytotoxicity. This article will systematically analyze the three key application nodes from fruit tree germination to harvest, helping growers establish a scientific pesticide management plan.
Pesticide Management Before Fruit Tree Blooming
Scientific Ratio of Fruit-Preserving Pesticides
It is recommended to use a solution of 0.01% gibberellin + 0.3% boric acid from germination to the bud stage, with a controlled application rate of 600-800 liters per hectare. The concentration of naphthylacetic acid needs to be strictly controlled between 10-15ppm, as excessive use can easily lead to leaf abnormalities. It is suggested to apply pesticides after the dew dries in the early morning to ensure full absorption by the leaf surface.
Synergistic Effect of Trace Elements
Mixing boron with a 5% sucrose solution can increase pollen vitality by 28%-35%, with a recommended ratio of 1:2000. The simultaneous supplementation of medium and trace elements such as zinc and magnesium can enhance the tree's resistance to adversity, especially in areas affected by late spring frosts.
Post-Blooming Disease and Pest Control Strategies
Principles of Pesticide Selection
After 7 days of blooming, it is preferable to use a lime sulfur solution with a concentration of 3-5 degrees Baume, which can achieve a control rate of scale insects of over 92%. For apple trees, it is recommended to combine with a 25% suspension of chlorpyrifos, and for pear trees, a 10% wettable powder of imidacloprid is suitable. It is necessary to rotate the use of pesticides to avoid resistance.
Key Points of Pesticide Application Technique
Use an electric sprayer with a high degree of atomization to ensure that the pesticide solution covers the back of the leaves. When the air humidity is greater than 65%, the amount of pesticide used should be reduced by 20%, and if it rains within 6 hours after application, a re-spray is needed. It is recommended to add an organic silicon synergist to increase adhesion.
Nutrition Regulation During Fruit Expansion
Application of Fruit-Strengthening Pesticides
In the early stage of fruit expansion, the application of fruit-strengthening蒂灵 should be diluted at a ratio of 1:500, with two consecutive applications spaced 15 days apart. Combined with the use of 0.3% potassium dihydrogen phosphate can increase yield by 18%-25%, and喷施 should be avoided during the high-temperature noon hours.
Comprehensive Measures for Preventing Fruit Drop
Establish an integrated water, fertilizer, and pesticide management system to maintain the relative soil moisture content between 60%-70%. The supplementation of calcium can effectively reduce the fruit cracking rate, and it is recommended to use a sugar alcohol calcium solution at 800 times for foliar topdressing.
By accurately grasping the pesticide management of the three key periods, the fruit setting rate of fruit trees can be increased to over 85%, and the incidence of diseases and pests can be reduced by 30%. It is recommended that growers establish a pesticide application log to record the pesticide ratio, weather conditions, and feedback on effectiveness, gradually optimizing to form a pesticide application plan suitable for local climatic conditions.