Grape powdery mildew can be infiltrated with all green parts such as leaves, fruits and branches, and young tissues are more susceptible to dip and damage. The leaves are damaged, and irregular yellow or yellow plaques are formed on the front of the leaves. The front and back of the lesions are covered with a layer of white powder ( generally more front and less back ) . In severe cases, the white powder is full. Leaves, uneven leaves, gradually curled and withered off ; new shoots, fruit stems and cobs are damaged, irregular brown or dark brown spots appear, feathers are extended outward, and the surface is covered with white powder, which can make ears The shaft and the fruit stem become brittle and the growth of the shoots is blocked.
Â
Grape powdery mildew usually from May to late June, early onset, 6 months late, to late July peak. Cultivation of grapes easiest to powdery mildew incidence and prevalence; the wine-growing dry growing season, is conducive to the occurrence of powdery mildew; moderate rain for grape growing areas, encounter drought years, the incidence of powdery mildew on the large; growth In areas with more rainy seasons, powdery mildew is less likely to occur and prevail ; when the cultivation is too dense, the nitrogen fertilizer is too much, the pruning and picking of the secondary shoots are not timely, the branches are long, and the orchards with poor ventilation and light transmission are weak, and the epidemics are weak. . In addition, young shoots, young leaves, and young fruit are prone to disease.
Â
Key points to prevent powdery mildew:
Â
　　 1. Do a good job in field hygiene, clean up the trimmed branches, leaves, diseased fruit, diseased fruit stems and cobs out of the field, and concentrate on treatment ( high temperature fermentation compost, high temperature treatment, etc. );
Â
　　 2. Spraying a stone sulphur mixture before germination ;
Â
　　 3. After falling flowers is a key period to prevent powdery mildew ;
Â
　　 4. Young fruit growth period to color change period, strict monitoring, disease detection, timely treatment.
Â
Medicine for preventing powdery mildew:
Â
　　 1. Sulfur preparations include stone sulfur mixture, sulfur powder, sulfur suspension, etc., which have a good therapeutic effect on grape powdery mildew and are the basic medicament for controlling grape powdery mildew ;
Â
　　 2. Protective fungicides are used in the critical period before and after flowering, and they have the advantages of broad spectrum and long-lasting effect. They can also be used together with therapeutic agents after onset. Chlorothalonil, agricultural anti- 120 , Wuyin, Bacillus preparation, etc .;
Â
3. Systemic fungicides difenophene, tebuconazole, azoxystrobin.
Â
Author: Zhang Wenli  Source of information: Gansu farmers report
Â
Â
There are many ways to design stone carvings. Relief: carving a three-dimensional image on the stone surface, which is a semi vertical sculpture. Because the image is embossed on the stone surface, it is called relief. According to the depth of the stone surface, it can be divided into shallow relief and high relief. Shallow relief is a single level statue, which has a single content and is not hollowed out. High relief is a multi-level sculpture with complicated contents. It is more attractive to use openwork techniques to hollow out. The reliefs are mostly used for the wall decoration of buildings, as well as the dragon columns and holding drums of temples.
Marble Sculpting,Marble Sculpting Process,Modern Marble Sculpting,Marble Sculpture Art
The universe in the stone is great , https://www.zdsarts.com