Preparation and Application of Bordeaux liquid in Pear Orchard

Bordeaux liquid, as a mineral pesticide, is a fungicide advocated in the process of green fruit production, and has a good control effect on pear ring disease and black spot scab. However, many fruit growers have improper operation in the process of preparation and use, resulting in reduced efficacy and even drug damage. The method of how to use Bordeaux liquid in pear orchard is introduced as follows:

Pear

(1) the proportion of preparation. The best proportion of copper sulfate, quicklime and water used in the Bordeaux liquid used in the pear orchard is 1-1-4-2 000, but in order to improve the adhesion of the liquid, the amount of lime can be increased appropriately, and each spray can last for 30 days for 40 days. The pear trees in the whole pear orchard can be sprayed only 3 times for 4 times during the growth period (April-September), which will not adversely affect the appearance of the pear and produce no fruit rust. However, the use of the traditional one-two-two-hundred Bordeaux solution can only last for 15 minutes and 20 days at a time, and it is easy to produce fruit rust. If the dosage of lime exceeds, the proportion of Bordeaux solution is lvv 6vl 200 Bordeaux solution, the photosynthesis of pear leaves will be affected and the efficacy will be reduced.

(2) the method of preparation. Bordeaux liquid should not be prepared in metal containers, but wooden buckets, plastic buckets or porcelain can be used. Lime should choose white, light, lumpy fresh lime, not the kind of lime that has been powdered for a long time. When preparing, first dilute copper sulfate with 2paw 3 water, and fully stir to dissolve it, then mix quicklime into thick lime milk with 1 hand 3 water, and then slowly pour the dilute copper sulfate solution into thick lime milk, while stirring, so as to form a Bordeaux solution with sky blue gel suspension without precipitation.

(3) the method of use. Bordeaux liquid, as a protective fungicide, should be used before the disease of pear trees, and the spray should be meticulous and uniform. Chengdu pear leaves should be sprayed to dripping water, branches should be washed, and about 150 kg per mu of pear orchards should be used for adult pear trees. The time of spraying should be from 9: 00 a.m. to 4: 00 p.m. on sunny days, and should not be used in cloudy days and dewy days. Rainy seasons are suitable for use before rain. The first use of Bordeaux solution for pear trees in southern China should be carried out 10 days after flowering, that is, as early as mid-April. Perdol solution, as an alkaline pesticide, should be mixed with other insecticides to avoid drug harm, and the time for using other insecticides and fungicides should be staggered with Bordeaux liquid for 7 to 10 days, otherwise the efficacy will be reduced. However, it is worth noting that Pedro solution can be mixed with acetaminophen, and can improve the efficacy. However, the long-term use of Bordeaux liquid in the pear orchard tends to aggravate the harm of red spiders, so before using Bordeaux liquid from May to July, 73% paracetamate should be used 1800 times, or 20% dicofol should be sprayed once in the whole garden.