First, the symptoms
The disease mainly damages the ear, and sometimes shoots and leaves are also damaged. The ears that are generally close to the ground have the earliest onset of cobs and pedicels, and the water spot-like lesions appear in the affected area at the beginning of the affected area. They gradually enlarge and surround the rachis to make the fruit soft and rot. On the surface of rotten fruit, gray and white spots are produced, ie conidia. During the wet season, the surface of the damaged fruit pieces burst and overflowed with pale yellow mucus.
At the beginning of dengue disease, it was a conidiophore of water-stained brown irregular germs. In severe cases, the dendrobium lesions were dry, the epidermis was separated from the xylem, and the cortex of the diseased section was split into a mess. Occasionally, the upper part of the diseased part produces callus, which becomes tumorous. The upper part of the diseased branch becomes yellow or reddish-brown until it dies. Most of the leaves in the tip or leaf margin of the disease, the lesion early stage of water-stained brownish-brown near-circular or irregular large lesions, the upper part of the relatively easy to produce gray-white small particles, that is, pathogenic conidia.
Second, control methods
1. Clearing the diseased ear, diseased grains and diseased leaves on the trees and on the ground in a timely manner during the elimination of pathogens, and intensively burying them can not only reduce the re-infestation of pathogens, but also reduce the number of pathogens that cause overwintering. After falling leaves in autumn, the diseased tissues such as diseased branches, diseased leaves, and diseased fruits in the garden are completely removed, and the overwintering pathogens are reduced.
2, strengthen the cultivation and management of reasonable pruning, timely binding of vines, picking the heart, in addition to the auxiliary shoots and sparse leaves, create ventilation and light environment, to reduce the incidence of disease, and to increase organic fertilizer, foliar fertilizer, make the tree strong, improve resistance Disease power. In addition, the bagging of the ear near the ground can also reduce the infection of pathogens.
Third, chemical control
1, eradicate the pathogenic bacteria in winter before the early spring grape germination to the tree and the ground spray 3-5 degrees lime sulfur agent or spray 50% methine WP wettable powder 200 times, or spray 5% Kedan Dan wettable powder 200 times liquid It has a good effect on the elimination of overwintering germs, and can also treat anthrax, powdery mildew, downy mildew, brown spot and so on.
2.Spray protection: After the leaf is spread, combine 50% of thiram blue WP with 500-700 times of liquid, or 50% of TU wettable powder 800 times, or 75% of chlorothalonil wettable powder. 600-800 times liquid. Due to the strong copper-resistance of white rot fungi, the effect of spraying and preventing multi-liquid treatment of Boron is not good.
The disease mainly damages the ear, and sometimes shoots and leaves are also damaged. The ears that are generally close to the ground have the earliest onset of cobs and pedicels, and the water spot-like lesions appear in the affected area at the beginning of the affected area. They gradually enlarge and surround the rachis to make the fruit soft and rot. On the surface of rotten fruit, gray and white spots are produced, ie conidia. During the wet season, the surface of the damaged fruit pieces burst and overflowed with pale yellow mucus.
At the beginning of dengue disease, it was a conidiophore of water-stained brown irregular germs. In severe cases, the dendrobium lesions were dry, the epidermis was separated from the xylem, and the cortex of the diseased section was split into a mess. Occasionally, the upper part of the diseased part produces callus, which becomes tumorous. The upper part of the diseased branch becomes yellow or reddish-brown until it dies. Most of the leaves in the tip or leaf margin of the disease, the lesion early stage of water-stained brownish-brown near-circular or irregular large lesions, the upper part of the relatively easy to produce gray-white small particles, that is, pathogenic conidia.
Second, control methods
1. Clearing the diseased ear, diseased grains and diseased leaves on the trees and on the ground in a timely manner during the elimination of pathogens, and intensively burying them can not only reduce the re-infestation of pathogens, but also reduce the number of pathogens that cause overwintering. After falling leaves in autumn, the diseased tissues such as diseased branches, diseased leaves, and diseased fruits in the garden are completely removed, and the overwintering pathogens are reduced.
2, strengthen the cultivation and management of reasonable pruning, timely binding of vines, picking the heart, in addition to the auxiliary shoots and sparse leaves, create ventilation and light environment, to reduce the incidence of disease, and to increase organic fertilizer, foliar fertilizer, make the tree strong, improve resistance Disease power. In addition, the bagging of the ear near the ground can also reduce the infection of pathogens.
Third, chemical control
1, eradicate the pathogenic bacteria in winter before the early spring grape germination to the tree and the ground spray 3-5 degrees lime sulfur agent or spray 50% methine WP wettable powder 200 times, or spray 5% Kedan Dan wettable powder 200 times liquid It has a good effect on the elimination of overwintering germs, and can also treat anthrax, powdery mildew, downy mildew, brown spot and so on.
2.Spray protection: After the leaf is spread, combine 50% of thiram blue WP with 500-700 times of liquid, or 50% of TU wettable powder 800 times, or 75% of chlorothalonil wettable powder. 600-800 times liquid. Due to the strong copper-resistance of white rot fungi, the effect of spraying and preventing multi-liquid treatment of Boron is not good.
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