Spring management of walnut trees. Water and fertilizer. From March to April, walnuts began to sprout, and it took almost one month to complete the growth and development process such as germination, germination, leaf spreading and flowering. At this time, it is also the spring drought and little rain season in the north, so fertilization and irrigation should be combined.

2. For the trees entering the fruiting period, before sprouting in spring, some main branches and auxiliary branches can be pulled to promote flowering. Bud carving method is to carve a bud in different directions every two buds on both sides of the branch.

Prevention and control of pests and diseases

1. The main pests in spring are sucking pests. Before the germination of Carya cathayensis in March and April, 10% imidacloprid wettable powder can be sprayed with 2500-5000 times solution. Scrape off the upturned skin of the trunk to expose the white green skin. Two semicircles are staggered, with a width of 5 ~ 10 cm, and 40% dimethoate emulsion 5 ~ 10 times is applied.

2. The peak season of walnut rot is spring and autumn in a year, especially from mid-April to mid-May, and trees with weak trees or severe freezing damage are prone to disease. Can cooperate with scraping old skin and diseased spots, and apply 100 times formosa solution.