Iron deficiency yellowing disease in wolfberry has occurred in Jiangsu, Anhui, Shanghai, Jiangxi, Fujian and Hunan. In severe cases, it will die within 2-3 years. Symptoms This disease is a whole plant disease. Symptoms are mainly on young leaves and shoots. The young shoots of the plants are yellow, yellowish green or yellow-white, and the leaves are thin and small. The lower leaves are light green or yellow-green, but the veins are still green. Axillary buds sprout, forming many tiny clusters of lateral branches. The diseased nodes are shortened and the clusters form clumps. When the disease is serious, the small tree can be yellow-white in the whole plant, and the veins are also yellow-white, and the top of the young shoots are burnt to death. Diseased plants are susceptible to freezing injury in the winter. The cause of jaundice is mainly due to the lack of soluble iron in the soil. In some areas, because the soil contains more carbonates, the soil reacts alkaline, so that the soluble iron content is low; or due to excessive rainfall, excessive leaching of soluble iron in the soil; in the soil viscosity, groundwater level is too high In the soil, the normal physiological activities of the plant roots are affected, which reduces the ability of the roots to absorb ferritin. Therefore, the plants lack available iron, which affects the formation of chlorophyll and yellows. Control methods 1. Gardenia should not be planted in alkaline soil, nor can it be planted in areas where the terrain is low and water is easy to accumulate, as well as in construction waste that is abandoned in the old homestead and contains more lime. Otherwise, the roots are stunted and prone to yellowing. . 2, the application of organic fertilizer, in the organic fertilizer appropriate to add some ferrous sulfate, such as a hand-carried organic fertilizer can mix 250 grams of ferrous sulfate. When applied to the soil, organic acids produced during the decomposition of organic fertilizers increase iron activity and make the plants easier to absorb. 3, the disease strain can be poured with 0.1-0.2% ferrous sulfate aqueous solution. An iron chelate aqueous solution can be applied to the soil, and depending on the water of the tree, about 25-100 g per plant is applied. Use 500 grams per 10 square meters in the seedbed. After the leaf color turns green, it does not need to be used again. 4, in alkaline soil, combined with fertilization, the appropriate application of physiological acidic fertilizers such as ammonium sulfate, ammonium chloride, superphosphate, etc., to improve the physical and chemical properties of the soil and improve the effectiveness of iron in the soil. Food Additives,Crab Chitosan,D-Galactose Powder,Calcium Gluconate SHAANXI HAIBO BIOTECHNOLOGY CO., LTD , https://www.rozenbio.com