Control Methods for Yellowing Leaves of Winter Jujube Trees

Yellowing leaves of winter jujube trees are mainly caused by weakened tree vigor, and the causes of leaf yellowing are many-sided. First, diseases such as bacterial scab, jujube rust, and dieback cause early defoliation, resulting in insufficient stored nutrients in the tree and weakened tree vigor, which leads to leaf yellowing; second, poor healing of the girdling wound and weak tree vigor cause insufficient water and nutrients, resulting in leaf yellowing; third, low-lying terrain and severe waterlogging cause leaf yellowing; fourth, root diseases or excessive application of chemical fertilizers cause fertilizer damage, root rot, and dead roots, and insufficient water and nutrient supply leads to yellow leaves; fifth, certain deficiency symptoms, such as iron deficiency, nitrogen deficiency, phosphorus deficiency, sulfur deficiency, copper deficiency, zinc deficiency, and manganese deficiency, can all cause leaf yellowing.

To prevent and treat yellowing leaves of winter jujube trees, the causes of leaf yellowing must first be analyzed and diagnosed, and then the appropriate remedy applied. For example, when yellow leaf disease occurs due to nutrient deficiency, tree nutrients should be supplemented in a timely manner, but supplementing only certain elements such as iron, zinc, and phosphorus is difficult for jujube trees to absorb, so attention must be paid to the fertilization method. Underground topdressing can be adopted, using well-rotted farmyard manure or multi-element organic-inorganic compound fertilizer, or amino acid chelated fertilizer for root irrigation. Foliar spraying can also be used, spraying 0.7% Flower Bud Treasure or full-nutrient amino acid chelated fertilizer once every 15 days, such as amino acid chelated iron, calcium, zinc, manganese, Tianda 2116 plant cell membrane stabilizer, jujube tree premium nutrients, etc.