5 methods for management of nectar honey fungus root rot

Kiwifruit honey ring root rot occurs mostly in high temperature and high humidity environment, which seriously affects the quality and commodity value of kiwifruit, and timely pesticide control to reduce losses. China Pesticide Network Xiaobian detailed analysis of the causes of pathogen formation and how to prevent and cure:
Pathogen: Actinidia rot of kiwifruit mainly occurs in the high temperature and high humidity season. Generally, around April, as the temperature rises, the rain increases, and the honey fungus grows in the soil in the remaining diseased tissue by hyphae and hyphae. The overwintering bacteria are also warming up in the spring, and the tree begins to move after the germination. The hyphae invade from the grafting part of the tree or from the apical wound. The pathogen is rotted and lived, and it can also parasitize on some plants, and enters from May to August. The peak of the disease, the pathogen can be repeatedly infected during the onset. The orchard has low terrain, poor drainage, underground pests, diseased plants are not treated in time, and the diseased bodies are not thoroughly cleaned, which can aggravate the spread and harm of the disease.
Transmission route and disease conditions: The honey fungus is mainly transmitted by the root fungus or the fungus. When the honey fungus is adsorbed onto the host root, it is invaded by enzymatic hydrolysis or pressure. In the woodland where the harvest is short, or the well-drained sandy soil is susceptible to disease. Due to the parasitic weakness of A. faecalis and A. meliloti, it can survive on the roots for a long time, leading to the onset of new orchards, and the incidence of old apple orchards is heavy.
Control method:
(1) Cultivation of disease-free seedlings. Planting disease-free seedlings of grasses for many years. It is best to use the fully decomposed manure or cake fertilizer for the nursery foundation fertilizer, and avoid using the slag fertilizer collected in the forest.
(2) Field management. The pesticide network recommends removing all plant residues during the new garden and not burying any wood or stumps in the soil. Strengthen the management of fertilizer and water in the orchard, enhance the tree potential, and improve the resistance of the tree. Pay attention to drainage during the rainy season to prevent water from accumulating in the orchard.
(3) Strengthen management. For apple orchards with high groundwater level, it is necessary to do drainage work, especially in the case of rain after rain; increase organic fertilizer, improve soil permeability and enhance tree potential.
(4) After the disease is found, the root of the disease is removed in time. For the entire rotten root, it must be cut off from the roots and carefully scraped out of the diseased department until the roots are removed. It can be disinfected with 1~2% copper sulfate solution. It can also be mixed with 40% pentachloronitrobenzene powder into 1:50 soil. After mixing, it is applied to the root. The dosage varies with the age of the tree. The amount is 0.25 kg.
(5) In the early spring, late summer, autumn and fruit tree dormancy period, dig 3 to 5 radial grooves at the base of the trunk. The pesticide manufacturer recommends pouring 50% thiophanate-methyl sulphur suspension 800 times solution or 25% bacteria. Ling • cyclohexyl zinc emulsifiable concentrate 800 times solution, 20% methyl chlorophosphorus emulsifiable concentrate 1000 times solution, will have good control effect.

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