Azalea Disease Prevention and Control

The diseases of azaleas mainly include root rot, brown spot, black spot, leaf blight, and iron deficiency yellowing.

After suffering from root rot, rhododendrons grew weak, and the leaves were wilting and dry. Water-stained brown fields appeared on the root surface. Severe soft rot was gradually rotted and peeled, and the xylem became black. The disease is most likely to occur under conditions of high temperature and high humidity.

The prevention and control method is to sterilize the earth before dumping and keep the soil loose and moist to make it have good permeability and prevent water accumulation. If the plant is found to be sick, the diseased plants and potted soil should be treated in time. For treatment, use 0.1% potassium permanganate solution or 2% ferrous sulfate solution

Wash the diseased plants, rinse with fresh water, and re-wash basins. With 70% thiophanate WP plus 1000. times the water made solution spray basin soil, can be cured.

Brown spot is a major disease of azaleas. At the time of disease initiation, brown spots appeared on the leaves and gradually developed into irregular spots. Many black or gray-brown spots were generated on the lesions, causing the affected leaves to turn yellow and fall off, affecting flowering and bud development in the following year. . This disease often occurs when humidity is high during the rainy season.

The treatment method is to pay attention to the ventilation and light transmission of the plants, not to make the humidity too high, and to increase the application of organic fertilizer and NPK mixed fertilizer to enhance the plant's ability to resist infection and growth. If diseased leaves are found, they must be promptly removed and burned. At the beginning of the disease, spray 0.5% Bordeaux mixture or 0.4 Baume degree lime sulfur, and add 4% flour to increase adhesion. Leaf spot and black spot can also be treated in the same way.

Iron deficiency yellowing often occurs in areas where the soil is alkaline. When the disease is mild, only the phenomenon of late-greenness occurs; when it is severe, the leaf tissue can turn yellow and the edges of the leaves are dry. At the time of onset, the leaves on the tips of the plants showed the most obvious, usually caused by internal iron deficiency.

The prevention method is to change the iron deficiency properties in the soil and reduce the alkalinity of the soil. Increase organic fertilizers to modify the clay soil. For iron-deficient plants, 0.2%-0.3% ferrous sulfate solution can be directly sprayed. It is also possible to poke holes in the soil around the plant with holes of about 15 cm in depth, and slowly inject it with a 1:30 aqueous ferrous sulfate solution to fill the holes to increase the acidity of the soil and reduce the alkalinity.

The incidence and environmental conditions of black spot disease in azaleas are similar to that of brown spot disease. Similar methods can be used for prevention and control.

Greenhouse Drip Irrigation System

Fertigation is using your irrigator to fertilise the plants and soils as you water, which is the most efficient and advanced practice of fertilization. Aid of pressure system (or natural divide terrain), the soluble solid or liquid fertilizer, according to the soil nutrient content and crop fertilizer regularity and characteristics of species, with the fat of with irrigation water, through a controlled water supply pipeline system, supplying, the compatibility, water through the pipe and drop head form drip irrigation, uniform, regular, quantitative, infiltration area crop root growth and development, make the main root soil always stay loose and appropriate moisture content, at the same time according to different crop fertilizer characteristics, environment and soil nutrient content in soil; Crops in different growth phase water requirement, the different development stages of the fertilizer rule is the demand of design, the water and nutrient timing quantitative, provided directly in proportion to the crops.

Greenhouse Drip Irrigation System,Greenhouse Micro Irrigation System ,Plant Drip Irrigation

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