1 The use of Trichogramma to control the rice leaffolder Trichogramma species is an egg parasitoid, and there are many species. In China, there are many Trichogramma species, which are the natural enemies of rice leaffolders. Generally, Trichogramma can be artificially propagated. At a temperature of 26°C to 28°C, generations can be completed within 6 to 8 days. The bees began to bee at the beginning of the spawning period of pests, and were released once every 2 to 3 days, and continuously for 3 times. The amount of bees to be released depends on the density of the eggs of the pests, and generally 1 to 30,000 heads of bees are released. The bees should be evenly distributed, and the number of bees placed should be determined according to the dispersal ability and temperature of the bee worm, the wind direction, the wind speed, and other conditions, generally 3 to 5 per 667m2. The method of putting the bees is to use the egg card that is about to feather the bees into a bamboo tube or a large, thick plant leaf and put it in a “T†shape with a small stick, inserted in the field, slightly higher than crop. After 10 days of bee release, parasitic conditions can be checked based on changes in egg color. Note that the parasite eggs are black, and the control effect of large areas should generally reach more than 70%. 2 Using Spiders to Control Rice Pests Arachnid Arthropods, Arachnida, Araneae. Many species, large quantities, are carnivorous. Distributed in farmland, orchards, forests, etc., can prey on a variety of pests. Farmland spiders are the main predatory natural enemies of rice pests. There are mainly grass black spiders, water wolf spiders, tarantulas, etc., accounting for 70% to 80% of the total spiders. Rice field spiders prey on rice planthoppers, fortune leafhoppers, rice borers, rice leaf roller, rice borers, rice borers, and aphids. A tarantula can be prey on 4 to 6 heads; a black grass spider on a grass can prey on 2 to 3 heads a day. It has been observed that the 1:4 ratio of rice field spiders to rice planthoppers and rice leafhoppers can play a controlling role. The use of paddy field spiders is mainly to protect natural resources, to provide necessary artificial mobilization, and to plant soybean crops in field ridges as far as possible so as to provide a temporary shelter for spiders during spring ploughing. Chemical pesticides used in farmland should use high-efficiency, low-toxic, selective pesticides, and improve the application methods to reduce the application area and times. Such as the control of rice bran can be used "carbofuran granules", "Badan", "insecticide double", not only can control pests, but also protect spiders and other natural enemies less killing. 3 Use of insectivorous vertebrates to prevent rice pests from controlling rice pests. In our country's main rice-producing area, it is effective to carry out duck-prevention and control of rice pests. Ducks can catch rice planthoppers, rice leafhoppers, codling moths, armyworms, rice borers, leafhoppers, etc. in rice fields. The experience of ducks in controlling rice pests is: According to the growth characteristics of the seedlings and the occurrence of pests, ducks are batched. The seedlings must not be put into the field before being put into use and the ducklings should be put in the field during the tillering period; the ducks in the round culm and booting stage can be mixed; the middle and ducklings can only be put in the heading filling stage, and the duck cannot be enlarged. The number of ducks should be 2 to 3 ducks per 667m2. Before dropping ducks, paddy field should be placed 7~8cm water to facilitate the floating of ducks and shake the pests into the water. It is worth noting that rice is not suitable for ducks in areas where B. oleracea is endemic and protected and where spiders and frogs are used to treat pests. Protect frogs against rice pests. Amphibians, frogs and frogs are collectively referred to as frogs. They mainly use insects and other small animals as food. The rice pests that the frogs prey on are: big larvae, pupa pupa, pupa pupa, rice planthopper, rice leafhopper, rice bran, and so on. Frogs also have large food intake. For example, a black spotted frog can eat 70 to 90 rice leafhoppers and rice planthoppers every day. A frog can eat up to 266 rice leafhoppers per day. Therefore, it is strictly forbidden to catch frogs and take measures to protect frogs. Collect frog eggs in the spring and establish a quail breeding base. After it grows to 3 cm, it will be raised in the middle of the field. It is necessary to keep the fields filled with water and pay attention to improving the fertilization method to protect crickets.
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