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How to prevent and treat jujube witches' broom? Introduction to practical prevention and treatment methods

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Jujube witches' broom is a devastating disease of jujube trees. After a jujube tree is infected, it shows the following abnormal phenomena: 1. Floral organs revert to ancestral form, the flower stalk lengthens to 3-6 times that of a normal flower, and the sepals, petals, stamens and pistils grow abnormally, becoming small pale green leaves. On diseased trees with stronger vigor, slender dwarf shoots may also sprout from the leaf axils of the small leaves, forming clusters of branches. 2. The main and secondary buds of developing branches and the fruiting mother branches sprout and grow multiple times a year, continuously producing small yellow-green branches and leaves, forming dense clusters of branches that do not easily fall off in winter. 3. On the trunk and branches of the whole tree, large numbers of latent buds that were originally dormant sprout massively

Jujube witches' broom is a devastating disease of jujube trees. After a jujube tree is infected, it shows the following abnormal phenomena: 1. Floral organs revert to ancestral form, the flower stalk lengthens to 3-6 times that of a normal flower, and the sepals, petals, stamens and pistils grow abnormally, becoming small pale green leaves. On diseased trees with stronger vigor, slender dwarf shoots may also sprout from the leaf axils of the small leaves, forming clusters of branches. 2. The main and secondary buds of developing branches and the fruiting mother branches sprout and grow multiple times a year, continuously producing small yellow-green branches and leaves, forming dense clusters of branches that do not easily fall off in winter. 3. On the trunk and branches of the whole tree, large numbers of latent buds that were originally dormant sprout massively, producing small yellow-green clusters of branches. 4. Sometimes small-leaf cluster-like root suckers sprout under the tree.

The occurrence of jujube witches' broom generally shows symptoms first on some branches and root suckers, and then gradually spreads to the whole tree. After young trees are infected, they usually die within 1-2 years, and infected large trees generally gradually die within 3-6 years.

The pathogen of jujube witches' broom is phytoplasma (MLO), a microorganism between viruses and bacteria. Current research has established: 1. Grafting can transmit the disease. After young trees are grafted with diseased branches, the shortest incubation period is 25-31 days, and the longest can reach 372-382 days. 2. Pollen, seeds, sap of diseased leaves and soil do not transmit the disease. 3. Insects such as Hishimonus sellatus and Hishimonoides sellatiformis are the main vectors transmitting the pathogen.

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