The yellow leaf disease caused by the virus is yellow and dark, and the edges are not clear; some are bright yellow patches of different sizes with clear edges; or strips with yellow spots, yellowing along the veins, and wide bands appear. Or fine mesh; there are also yellowed rims along the veins. It is strictly forbidden to use the ear on the diseased plant as a breeding material for the prevention and treatment of viral yellow leaf disease; it is the best way to destroy the diseased plant and promote the non-toxic seedling.
According to the pesticide network , the yellow leaf disease caused by iron deficiency is characterized by the fact that the new leaves in the upper part of the treetop are still green except for the veins, and the rest are all yellow-green or yellow-white. The leaves are small and thin, and the leaves are largely detached due to dry coke. Control methods: First, the application of organic fertilizer, the second is combined with deep doubling to apply 100:1 ferrous sulfate and animal mixed fertilizer, and the third is to spray 0.3% to 0.5% of ferrous sulfate in the early stage of germination.
Yellow leaf disease caused by nitrogen deficiency Due to the repeated use of nitrogen in the leaves, the nitrogen loss of the old leaves is yellow, and finally they fall off. The method of control can be applied with more nitrogen fertilizer or 0.3% urea solution.
The canopy water spray method can be used for the yellow leaf disease caused by drought without irrigation.
Early defoliation can also cause yellow leaf disease, mostly brown spot disease, with green lines around the lesions and gradually yellowing outward. The control method is to increase the application of organic fertilizer, clear the leaves in autumn and winter, and reduce the source of bacteria. In the first half of June, it began to spray 1000-1500 times of pesticides.
The leaves of the roots of the yellow leaf disease caused by root rot are small and yellow. In severe cases, the leaves are fully zoomed out within a few days. The prevention and treatment method is to deepen the soil and increase the application of organic fertilizer; ditch application, early spring or autumn Initially irrigated 1 wave of Meteorite sulphur mixture 0.2% ~ 0.5% copper sulphate solution, each plant is about 50 kg of medicinal solution.
Some yellow leaf diseases caused by fertilizer and phytotoxicity are too much fertilization, and the damage caused by too close to the root or excessive concentration of spray fertilizer or excessive spraying of pesticides can cause yellow leaf disease. Generally, the tip of the leaf and the edge of the leaf are yellow first, followed by rust. The amount of fertilizer applied and the amount of spray should not be too large and should be applied according to the specifications. After the onset, you can spray water on the canopy.
A variety of pests can cause yellow leaf disease method is timely symptomatic treatment. The China Pesticide Network reminds everyone that it is still necessary to adhere to medication for a week after pest control to prevent recurrence.
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