Zinc deficiency causes variegated leaves. Citrus orange leaf disease is a common disease, typical symptoms are mottled leaflets. The new leaves turned green and began to show that the main veins and lateral veins were significantly green, while the rest of the tissues were pale green to yellow-white and shiny. In severe cases, only the main vein or large lateral veins are green. The new leaves are small, mottled and erect, with short internodes and arbors. Mottle disease is caused by zinc deficiency. A variety of soils lack zinc, such as granite, gneiss, and serpentinite, the formation of soil zinc is less; acidic sandy soil, zinc is easy to lose; alkaline soil zinc is easy to form insoluble compounds, thus zinc deficiency. In addition, the soil is too dry and too wet, and less humus or too much organic matter is used, hindering the contact between the root system and the soil, and the occurrence of Zn deficiency in heavy shearing. Foliar fertilization can receive good results in preventing and treating zinc deficiency. Should be sprayed in the shoot stage 0.2% ~ 0.3% zinc sulfate (add the same amount of lime) liquid 1 time, severe zinc deficiency spray 2 ~ 3 times.
Copper deficiency or lack of boron causes blight. The early shoots of citrus lacked copper were long, soft, slightly curved, and the leaves were dark in color. The result was not much, and it was easily mistaken for excessive growth. In severe cases, the tips of shoots turn brown and die, short and weak twigs occur, and the leaves are easy to dry, fall and flow. When the branches are mature, the wounds are red-brown and the leaves are red-brown. Citrus needs very little copper, and it is usually enough to spray Bordeaux mixture. However, in the peat soil, acidic sandy soil, soil with high organic matter content, as well as grazing sites and graveyard sites, copper deficiency occurs easily; excessive application of manure and phosphate fertilizers also leads to copper deficiency; the new Orange Park has not applied copper such as Bordeaux for several years. Preparations are prone to copper deficiency. Citrus boron deficiency: The bud's growth point continuously withered to form clustered shoots, veins swollen, corked or broken, small fruit deformities, thick hard skin, fruit core and sponge layers all have brown resin deposits. Acidic soil is easy to lose boron, so it lacks sheds. The parent material such as granite, gneiss, and schist has a very low boron content; alkaline soils have poor solubility and are also deficient in boron. Excessive application of phosphate fertilizer or lime, or soil drought, both affect the effectiveness of boron and the absorption of boron in the roots; the weak boron-absorbing power of the lime, so the oranges with lime as an anvil are generally deficient in boron. For copper deficiency, Bordeaux or other copper fertilizers can be sprayed. Boron fertilizer can be applied to the soil, or sprayed with 0.05% to 0.1% boron fertilizer solution during the germination, flowering, and small fruit stages.
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