Detailed explanation of three methods of disease and insect pest control of Photinia rubra

Photinia rubra had strong resistance and no destructive diseases and insect pests were found. Common red-leaf Photinia diseases and insect pests are sudden disease, blight, leaf spot, anthrax, gray mold, leaf spot or by shell insects, and so on. Here are three major pest control methods for Photinia rubra.

First, select the nursery site.

Light clay loam or sandy loam with better water source and higher topography should be selected as nursery land, and rotation system should be adhered to, and the same kind of Photinia rubra should not be cultivated continuously in the same nursery.

When raising seedlings, the soil in the nursery should be disinfected in advance, and the main methods are as follows: ① formalin disinfection: every square meter of nursery is sprayed evenly with formalin 50ml and water 10kg, then covered with plastic film or straw bag, the mulch is opened for about 10 days, so that the gas can be volatilized, and the seeds can be sown two days later. ② carbendazim disinfection: mix 1.5g per square meter with 50% wettable powder. It can also be sprinkled on the seedling bed according to the proportion of 1 ∶ 20, which can effectively control the diseases in the seedling stage. ③ pentachloronitrobenzene disinfection: per square meter nursery land with 75% pentachloronitrobenzene 4 grams, Dysen zinc 5 grams, mixed with 12 kilograms of fine soil, sowing under the pad and cover, against anthracnose, blight, sudden disease, Sclerotinia sclerotiorum and so on. ④ ferrous sulfate disinfection: treat the soil with 3% ferrous sulfate solution, 0.5kg per square meter, which can control coniferous seedling blight, peach and plum leaf shrinkage disease, and chlorosis caused by iron deficiency in flowers. The nursery should be ploughed deeply in winter and once shallowly when sowing in the second year.

Second, seed disinfection

Seeds should be carefully selected before sowing to eliminate diseases and weak species. When sowing, the seeds should be treated with medicine. Soak the seeds with 0.3%-0.5% potassium permanganate solution for half an hour to 1 hour or soak the seeds in warm water of 50 degrees Celsius for 24 hours. Then soak the sunken seeds with 0.2% formalin solution for 30 minutes, and then soak them for another 2 hours. You can also soak the seeds with 0.5%-1% copper sulfate solution for 1 hour to 2 hours, then pick up the seeds and rinse the solution with clean water, and sow the seeds in time after drying. Pay attention to the depth when sowing, and the cover soil should not be too thick so that the seeds can germinate and emerge.

III. Drug treatment

Starting from the seedling stage of Photinia rubra, every 7 to 10 days, 50 kg to 75 kg of 0.5% Bordeaux solution is sprayed on the seedling bed of Photinia rubra every 7 to 10 days, so as to form a protective film on the outside of the seedlings and prevent the invasion of germs. At the same time, in order to apply fertilizer well, it should be stacked and fermented before it can be used. After the disease, remove the diseased Photinia seedlings in time, sprinkle lime powder around the seedling holes of the diseased Photinia chinensis, to prevent spread, and apply once every 10-15 days, you can spray 100kg / mu of dioxone 500x-800x solution, or 65% Dysen zinc 300kg-800x solution 100kg spray, or use 1 ∶ 100kg arsenic methyl sulfide soil, or 8 ∶ 2 grass limestone powder mixture for treatment. It can also be sprayed with copper-ammonium mixture.

Botrytis cinerea can be prevented by spraying 50% carbendazim 1000 times solution, and during the onset period, 50% Dysen zinc solution can be used to prevent and control the disease. Leaf spot disease can be controlled with more than 60% carbendazim 300 Mel 400 times or Topurazin 300 Mel 400 times. Scale insects can be sprayed with 200 times of dimethoate emulsion or 800ml 1000 times of liquid spray. Soil silkworm control should be carried out before planting, the land should be properly ploughed, and sprinkled with phosphorus insecticides such as soil insects must be killed. If you encounter the harm of soil silkworm after planting, it needs to be remedied in time, otherwise it will do great harm to spread, especially for Photinia rubra at seedling stage, which may cause large area death.