Recently, a reader in southern Weinan, Shaanxi Province, called the newspaper to report that the jujube fruit rust was serious in its own jujube garden. The cause of the disease and its prevention and control methods were inquired. The reporter interviewed Zhang Ligong, a fellow researcher of the Western Fruit Friendship League. He was a fruit worker.
The law of incidence
Jujube fruit rust is a physiological disease. The occurrence of fruit rust is related to the method of cultivation and management. Where the conditions are good, strong tree vigor and complete leaves of the jujube garden, fruit rust occurs lightly or does not occur, and vice versa. Fruit rust is prone to occur at low temperatures, humidity, and cold winds, and the incidence is closely related to the atmospheric humidity within 16 to 20 days after flowering. Therefore, fruit rust occurs at different levels in different years. The general fruit contains high nitrogen and phosphorus, light fruit rust, and vice versa. The rust scorpion is a seriously damaged jujube garden with heavy rust. Spraying agents containing high levels of copper sulphate during young fruit can also produce fruit rust.
Control methods
Strengthen the management of the jujube garden, enhance tree vigor, reduce the occurrence of fruit rust; fruit development is good, fruit rust significantly reduced; timely irrigation when the soil is dry, can reduce fruit rust; timely control of rust wall lice can reduce fruit rust.
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