How to identify apple anthrax leaf blight
Apple anthracnose leaf blight is a highly endemic disease, which mainly damages the leaves and fruits, resulting in a large number of early leaves, reducing the commercial quality of fruits and threatening the apple industry. Since its occurrence in 2008, it has spread almost all over the apple production area of ​​the old course of the Yellow River and has spread to the apple production areas in Shandong and Shaanxi. In order to prevent and control this disease, we must first be able to carry out the correct diagnosis. The following describes the diagnostic procedures and methods of anthrax leaf blight: 1. Anthrax leaf blight diagnosis. Anthracnose leaf blight mainly occurs in the varieties of the Golden Delicious series, such as Cockroaches, Qin Guan, Jin Shuai, and Jonakin. In the Golden Crown series, if there is a large amount of fallen leaves in the rainy season from June to September, and the existing antiseptics have poor control effects, and are not familiar to the local technicians, anthrax leaf blight may be suspected and further diagnosis is needed. Diagnosis Method One: Diagnosis based on symptoms of fruit and young leaves. After anthracnose leaf blight has infected the fruits, brown and round lesions with a diameter of about 1 mm are mainly formed, and the edges are often accompanied by red halos. The number of lesions is large, and the number of lesions on individual fruits amounts to several hundred. The diseased fruits become “pock-nuts†(as shown in the figure) and the lesions no longer expand. When young leaves are infested, black lesions of unequal size are produced, the lesions are fuzzy at the edges, and the internal tissues of the leaves turn black when observed through sunlight. If the above symptoms occur simultaneously on the fruit and young leaves, anthrax leaf blight may be diagnosed. Diagnostic method II: Diagnosis based on conidial piles produced on diseased leaves. Collect 3 to 5 fresh diseased leaves from the tree, put them in plastic bags, place a wet cotton ball in the bag, and blow air into the bag to seal it. The sealed plastic bag is placed in a humidified culture at 25°C to 30°C for 3 to 5 days. If the leaves can produce orange conidia (typical conidia of anthrax), it can be diagnosed as anthrax. Diagnostic method 3: Based on the diagnosis of ascospores on diseased leaves. Collect 5 to 10 diseased leaves that fall on the ground, directly inspect them, or moisturize them at 25°C to 30°C for 3 to 5 days, and check whether there are any black spots on the diseased leaves. If yes, use a needle to pick up the black spot microscopy. If anthrax spores are detected by anthrax, anthrax leaf blight may be diagnosed. 2. The main difference between anthrax leaf blight and brown spot. Anthracnose leaf blight only infects varieties of the Golden Crown series, brown spot pathogens can infect all varieties; anthrax leaf blight bacteria can infect the fruit, and brown spot pathogens rarely infect fruit; the new lesions of anthracnose leaf blight are not small Dark spots, with blurred edges, fresh spots of brown spot, small black spots and bacilli, with rims radially along the bacilli. 3. The difference between anthrax leaf blight and spotted leaf disease. The anthracnose leaf blight only infects the Golden Crown series, and the deciduous leaf disease mainly infects the Marshals; the anthracnose leaf blight bacteria can infect the fruit, and the Alternaria fulgidus rarely invade the fruit; anthracnose leaf blight can infect all ages. The leaves of P. fulgidus mainly infect young leaves. The picture shows the lesions of apple anthracnose leaf blight on the fruit. Insect net greenhouse also known as plant and vegetables greenhouse net. Used for prevent the insect fly into the greenhouse during the plant growing, and cover the plants. Key off the approaches that the pests (adult insect) breeding. Effective control of the spread of all kinds of harmful pests spread, such as Cabbage caterpillar, diamondback moth, aphids, flea beetles, Sweet agnates, American leaf miner, literal etc and prevent the harmful of virus spread. Significantly reduced the use of chemical pesticides, so that the planting vegetables good-quality and health. Greenhouse Insect Net,Insect Mesh Netting,Insect Mesh JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com