What do peach trees usually use to control their prosperity?

Application of paclobutrazol on peach trees;

When should I take the medicine? Peach trees in Wangchang can be applied with soil during the flower bud expansion period in spring, so as to exert the drug effect early, control the growth of new shoots and improve the fruit setting rate. Peach trees with moderate growth should be treated with pesticides during the vigorous growth period of new shoots (the growth length of new shoots is about 20 cm) after flowering to control the occurrence and growth of secondary branches. Peach trees with medium growth can be sprayed with 500- 1000 mg/kg paclobutrazol in August to improve the quality of flower buds. It should be noted that young trees and weak trees aged 1-2 years are not suitable for pesticide application.

Dose? The application rate is mainly determined by factors such as tree age, tree potential, crown size and variety. Use Wang Shu and Da Shu more, or use less. Yellow peach varieties such as Wanjin and Agnes usually use less drugs 10-20% than southern peach varieties such as Shanghai Peach and Okubo. For the first application, the crown projection is 0 per square meter. 50- 1g (refers to the commercial quantity of paclobutrazol wettable powder containing 15% active ingredients).

Soil pesticides have obvious effects after 3 years of application, and the effect is the most obvious in the first year, and then decreases. How to apply pesticide in the second year should be judged according to the growth and development of peach trees: after the first year of application, the medium-long fruit branches formed by peach trees account for about 30% of the total branches, and a small number of secondary branches are produced. It shows that the application volume is appropriate, and the application volume in the next year is about 50% of the application volume in the previous year. If the proportion of medium-long fruit branches on peach trees is large, more and more secondary branches are produced, which means that the application amount in the previous year is less, and the application amount in the next year should be more than 60% of the application amount in the previous year; If the fruiting branches are mostly short fruit branches and bouquets, and the middle and long fruit branches are unable to droop, it means that the application amount is too large, and no or less pesticides will be applied next year. If the application amount is too large, it will inhibit the growth of peach trees, so it is necessary to find it early and spray 50 mg/kg gibberellin in time to reduce its inhibition.

Application method? The practice of most experts proves that soil application of paclobutrazol has the best effect. The method is to dig an annular groove with a depth of 10 cm and a width of 30-50 cm inside the projected outer edge of the crown, dilute the medicine with water to 1000-2000 times, then evenly spread the prepared medicine into the annular groove, and cover the soil after the water seeps down. In the process of use, the prepared liquid medicine should be constantly stirred to avoid accumulation, resulting in uneven use and affecting the effect after use. You can also dig an annular ditch according to the above method, mix the powder and fine soil evenly, spread them evenly in the ditch, stir them evenly with a shovel and shovel, and water the soil when it expires.

Post-application management After paclobutrazol was applied to peach trees, flower buds increased, fruit setting rate increased and yield increased. Therefore, it is necessary to strengthen the management of soil, fertilizer and water to meet the needs of their growth and fruit. When pruning in winter, it is necessary to adjust the amount of flowers, appropriately increase the short section, and remove the short fruit branches and bouquets that are too dense and too weak. After fruit setting, the fruit should be thinned and the amount of fruit set should be adjusted to prevent excessive fruit setting from affecting the fruit setting characteristics, weakening the tree potential and accelerating the aging of peach trees.