Pollution-free control techniques of growing citrus

The use of chemicals to control diseases and insect pests in citrus has high cost and is easy to produce drug resistance. Guide fruit growers to adopt the following simple and economical methods to control some citrus diseases and pests. The specific prevention and control methods are as follows.

The main results are as follows: 1. Plant ash control of leaf miner begins when the length of the new leaf is about 3 cm, and until the new shoot is ripe, it is sprinkled every 5 times every 7 days, 6 times in a row, and sprinkle in time after rain during the interval. When the dew is not dry in the morning, or after rain or after spraying water, plant ash should be sprinkled on the leaf back of citrus shoot leaves in time, and the leaves should be kept adhering to ash powder throughout the shoot period until the leaves are mature. This method is suitable for greenhouse or open-air citrus nursery, young citrus orchard and pot ornamental oranges to control citrus leaf moth.

2. Lime water is used to control canker with 1 part of cooked lime powder just out of the kiln and 4 parts of clear water mixed into lime slurry filtered filtrate, diluted by 5% to control citrus canker. 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 Murray 15 days. Spray once when clearing the garden after fruit harvest, and spray through the tree evenly each time, which can effectively prevent the occurrence of citrus canker and reduce the injury rate of leaves, fruits and branches. At the same time, spraying 5% lime water in the young fruit stage of citrus can prevent sunburn and improve fruit quality.

3. Clear water control of red spiders using mechanical action to make clear water scour can control citrus red spiders. The method is to use water hoses mechanically pumped by pumps or spraying machines to reach the orchard. Wire cutters or other fixtures are used to make the pipe mouth in the shape of a fan hole (direct injection gun head is used in the spraying machine), so that when the clear water rushes out, it has a certain impact to wash the crown evenly. It can obviously reduce the population density of red and yellow spiders, wash away scale insects such as sagittal scale and aphids at the same time, reduce the occurrence of soot disease, wash the dust off leaves and fruits, which is beneficial to leaf photosynthesis, and resist drought in drought. in hot summer, it can cool and humidify the fruit to prevent sunburn. But in hot summer, water spraying must be carried out before 10:00 in the morning. It should be noted that this method is not suitable for use in the whole flowering stage, fresh shoot stage and fruit setting stage. It is suitable to be used in the mature stage of each shoot and during the period from July to October when the fruit grows and expands. The water quality used must be clean and pollution-free.

4. To kill longicorn beetles with gasoline, first clean the worm droppings in the longicorn beetle worms with iron wire, then use a medical syringe to directly inject 7 or 9 kilo gasoline into the wormhole, and seal the wormhole mouth tightly with yellow mud to prevent the gasoline from volatilizing to facilitate the killing of longicorn beetles. The amount of gasoline injected into the first instar, older and mature larvae was 2 ml, 4 ml and 6 ml, respectively. As there are many longicorn beetle borer holes, we should choose the hole closest to longicorn beetles to inject gasoline. If it is found that insect droppings continue to be excreted after gasoline injection, it should be reinjected once. This method is effective in the control of longicorn beetles.

5. tobacco bone human urine immersion solution for the control of sagittal scale and aphids 0.5 kg of chopped tobacco bones (that is, leftovers such as stems, petioles and veins of leaf tobacco) are immersed in 2.5 kg human urine for 8 days and then filtered and sprayed with 25 kg of water. it can be used to control citrus sagittal scale or aphids, such as adding 0.1% washing powder or 0.4% urea in use.