Measures for control of black spot of walnut
The pathogen of walnut black spot generally overwinters in shoots or buds, and the bacterial liquid secreted by Yanchun mainly harms young fruits, leaves and twigs by wind and rain. Management methods: 1. Overwintering management. After deciduous leaves, tree trunks and branches are smeared to protect the general from spreading germs on the tree, heat preservation, disinfection and frost prevention. At the same time, the general of tree protection was sprayed to disinfect the whole garden. 2. Prevention and treatment of virus. For the diseased trees, the whole garden should be sprayed with new high-fat film in time to form a protective film to enhance the efficacy and prevent the spread of germs through wind and rain. 3. Wound management. For some trimmed mouth, wound should timely smear callus anticorrosive film, protect the wound, prevent bacteria invasion, Rain Water pollution.
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Scientific planting techniques of walnut seedlings and walnut trees
The yellow diamondback moth has one generation a year in the north and two generations in the Yangtze River valley. The mature larvae after autumn often spin silk and form hard cocoons on branches, petioles and even leaves to survive the winter. The cocoon is oval, grayish white, with several brown longitudinal bands, shaped like sparrow eggs. In early summer of the following year, mature larvae pupate in the cocoon, and the Eclosion adult flies out 1 month later.
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Square Bud grafting technique of Walnut
The square bud grafting technique of walnut has the advantages of high survival rate, labor-saving and convenient operation, and the technology is easy to master and popularize, which is suitable for planting young trees and nursery seedlings. The square budding technology is introduced as follows: 1. Grafting time. It can be carried out from late May to mid-July, but the best time is in June.
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