Grasshopper is a common name for some species of anthropophagus. It is also called a water cricket. In many places, there is a large number of larvae parasitized on the surface of jaundice, causing the gradual death of jaundice, especially in the shallow waters such as rice fields. In general, the higher the density of livestock breeding, the faster the infection, and the deaths from the end to the end. Since the astragalus is a scaleless fish, the body surface is rich in blood vessels, so the grasshopper is easily parasitic. In the investigation, the author found that from the age of 5--7 centimeters, the type of grasshopper that had been grown until the time when it was grown into a clam, it was possible to have a parasitic grasshopper. Therefore, the cultivation of jaundice must have sufficient knowledge of the harm of leeches. Do a good job of prevention and control of leech. Mainly the following points should be made: (1) When selecting the water area for the culture of Astragalus, it should be investigated in advance to find out if any leech is present in the water area. If there are many leech in the water area, measures such as filtering should be taken to prevent the introduction of leech. Otherwise, it is not suitable for yellow cricket breeding grounds. (2) Thoroughly clean up and disinfect the water bodies of the rearing fish, especially the water bodies of the rice fields. Generally about 667 square meters (1 mu) use about 100 kg of quick lime, and turn the surface mud and then add water depth of 10 cm soak for about 10 days, conditional water pH can be measured, so that the pool water pH maintained at 9 for more than 3 days. (3) Before Huang Xie goes to the pool, he should be carefully examined. There are many ways to deal with them. They can be soaked in 2% saline solution for 10 minutes to make the blister completely fall off from the corpus callosum. However, it is easy to die; it is also possible to use copper sulphate in an amount of 10 mg/L to dip Astragalus 5- - 10 minutes, can make the blister fall off, but it should be used reasonably and properly. Otherwise, it is easy to die. In addition, can be used Min-2000 soaking treatment, the general use of the concentration of 5 ml per ton of water medication (about 5 grams), soaked 6--7 hours leech can be all off, 10 ml per ton of water medication is generally soak 1--2 hours The grasshopper can all fall off. According to the author's practice, Minmin 2000 is the safest to use, and the effect is excellent, but the disadvantage is that the soaking time is longer and the drug price is higher. (4) In the case of aphid parasitism occurring in the process of astragalus cultivation, the best method is to use Scorpion 2000, which uses 5 ml of water per ton of water. Secondly, the yellow locust was first picked up and treated with a soaking method to treat the leeches on the body surface of the jaundice. The breeding pond was then disinfected with 10 mg/L copper sulphate to kill the remaining leeches in the pond and then semi-sacrificial treatment was performed. High concentrations of copper sulphate are directly sprayed into the pool. In this way, deeper caves or aquatic plants should allow the yellow pelican to stick out of the water or hide. This method will kill some of the jaundice and should be weighed for use and change the water in time. (5) For those who are first-time raisers or those who are technically unsuccessful, it is not advisable to blindly pursue high density. For example, the output per 667 square meters of paddy fields should be controlled below 400 kg, which can reduce the mutual infection between jaundice. For prudent reasons, when using new drugs for Huang Biao, a small amount of preliminary drug trials should be made before use. In order to prevent the same name drugs and counterfeit drugs cause unnecessary losses.
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