After playing stone sulfur mixture, it rained.

Heavy rain after playing stone sulfur mixture may affect the efficacy, because with the loss of Rain Water, you have to make up for it after a sunny day; if the rain is relatively small and the impact is not great, you can not fight or fight again after a period of time. The main methods for the use of stone-sulfur mixture are spraying and drying, which takes at least 12 hours to dry, 1-2 days after spraying, 12 hours after spraying or 1-2 days after drying, and needs to be re-sprayed or dried.

1. What is the stone-sulfur mixture?

Stone-sulfur mixture is a kind of sterilization, acaricidal and insecticide used in agriculture, which is made of quicklime, sulfur and water. It can control powdery mildew, rust, brown rot, brown spot, scab, flow embryo disease, resin disease and other diseases as well as leaf mites, rust mites, red spiders, scale insects, aphids and other pests by infiltrating and eroding the body walls of bacteria and pests. Mainly used in apple, citrus pear, peach, grape, jujube and other fruit trees, can also be used in flowers, alfalfa, beans, wheat, tea trees and so on. It is easy to obtain materials, low price, high efficacy, long-lasting efficacy, low residue, no drug resistance, so it is widely used by the majority of fruit farmers.

2. Correct use of stone-sulfur mixture.

The use methods of stone-sulfur mixture are spraying and drying, and spraying is the most used. generally, it is used when the leaves of fruit trees fall completely and enter the dormant period, or before the sprouting of fruit trees, and can also be used in the growing period of fruit trees. During dormancy period, 3murine 5 Baume dilution of stone sulfur mixture was sprayed. Before sprouting of spring fruit trees, 3murine 4 Baume sulfur mixture diluent was sprayed, and 0.2 to 0.5 Baume sulfur mixture diluent was sprayed during the growing period of fruit trees.

3. Matters needing attention in the use of stone-sulfur mixture

(1) temperature: the water temperature of stone-sulfur mixture should be lower than 30 ℃, otherwise it will reduce the efficacy; the air temperature is better at 4-32 ℃, the air temperature is high, the efficacy is good, it should be used cautiously above 32 ℃, and cannot be used above 38 ℃ or less than 4 ℃.

(2) concentration: the temperature is low in winter, the plant is dormant, the concentration can be higher; the temperature in summer is high, the plant is in the period of vigorous growth, and the concentration should be low. The spraying concentration of trees and flowers is high in dormant period (early spring or winter) and low in growing season. Excessive concentration or high temperature is easy to cause drug damage.

(3) timing: to match with the use, it is best to use up the stone-sulfur mixture at one time, not for a long time, otherwise it will reduce the efficacy. Deciduous trees are the best time to use stone-sulfur mixture during dormancy and before sprouting in early spring, and evergreen trees have the best effect after picking and before flowering. Peach, plum, plum blossom, pear and other Rosaceae plants and Bauhinia, Albizia and other leguminous plants are sensitive to stone-sulfur mixture, so they should be used cautiously in the growing season and flowering, otherwise it will inhibit flower bud differentiation and reduce yield in the following year.

(4) taboo: stone-sulfur mixture should be mixed with Bordeaux liquid, copper preparation, mechanical emulsion, turpentine mixture and pesticides easily decomposed under alkaline conditions at an interval of 15-20 days. Avoid long-term use, long-term use will make diseases and pests produce drug resistance, the higher the concentration, the faster the formation of resistance, can be used alternately with other pesticides.