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Economic and simple citrus pollution prevention
Oranges use chemical agents to control pests and diseases, which are costly and susceptible to drug resistance. The author refers to the relevant information and has personally innovated and practiced to guide the fruit farmers to adopt the following simple and economical methods to control certain pests and diseases of citrus. The specific prevention and control methods are briefly described below. 1. Plant ash prevention and control leaf miners start when the shoots grow to about 3 centimeters at the tipping stage, until the new shoots are cooked, they are sprinkled once every 5-7 days, and continuously sprinkled 5-6 times, and at intervals. After the rain in the rain, the in-time make up. When the dew is not dry in the morning, or after the rain, or after the water spray, promptly spread the plant ash on the leaf blade of the new shoots of citrus. During the whole shoot stage, keep the leaves always adhere to the ash till the shoot leaves. After being matured. This method is suitable for greenhouses or open-air citrus nurseries, young orange gardens and potted ornamental oranges control citrus leaf miners. 2, lime water control ulcer disease with fresh kiln just out of the slaked lime powder 1 and 4 water converted to the filtrate after the lime mud filtrate, according to 5% dilution to control orange canker disease. About 20 days before each shoot, when the new shoot grows to 5 cm and the young fruit grows to 3 cm in diameter, it is sprayed every 10-15 days. After the fruit is collected, it shall be sprayed once during clearing of the garden. Each spraying shall be sprayed through the tree evenly, which can effectively prevent the occurrence of citrus canker and reduce the damage rate of leaves, fruits and branches. Spraying 5% lime water in the young fruit period can prevent sunburn and improve fruit quality. 3, water control Red spider use mechanical action so that water wash method can prevent orange spider mites. The method is to use a hose pumped by a pump or a spraying machine to reach the orchard. Use wire cutters or other clamps to make the nozzle hole-like (spray gun with direct spray gun head), so that when the water is flushed, there is a certain impact force to evenly wash the canopy. It can significantly reduce the population density of red and yellow spiders, and at the same time wash out the scale insects such as spines and aphids to reduce the incidence of soot; washing the dust on the leaves and fruits is beneficial to the photosynthesis of the leaves; Drought-resistance, cool weather, cool and prevent sunburn. However, the water spray must be performed before 10 o'clock in the summer. The precautions are that this method is not suitable for use throughout the flowering period, just for new shoots and just fruiting. It is suitable for use in the old ripening period of the shoots and the fruit grows from July to October. The water used must be clean and free of pollution. China Agricultural Network Editor