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Chemical Control Techniques of Cruciferous Vegetable Pests
Cruciferous vegetables are mainly pest-infested and controlled with chemical pesticides. Currently, they are the most commonly used method for pest control by farmers, and they are also the most serious method of contamination of vegetables. How can we scientifically Using chemical pesticides to achieve both pest control and product safety? Combining with local practical experience, introduce several common pest control methods. First, the diamondback moth. Hanging ghosts, commonly known as hangovers, are a type of pest that farmers face most. They are difficult to prevent and intractable, and they are extremely resistant to drugs. Almost all organophosphates, carbamates and pyrethroid insecticides have not effectively controlled the diamondback moth so far. Some farmers even fight drugs every day and they cannot control its damage. This is the reason. Therefore, only a few new types of pesticides can be used for Plutella xylostella, such as Caesar 10.8% EC 5000 times, or Ruijinte 5% SC 2000 times, or Po Lu 50% WP 1000 times. Drug resistance is slow, it is recommended that such a preparation can only be used about once a year in one place, and it should be used in conjunction with organic phosphorus, carbamate, and pyrethroids. Second, cabbage caterpillar. The cabbage caterpillar is one of the most serious pest species on cabbage and broccoli, and when it is severe, it often results in a decrease in yield and a decline in quality. The control of cabbage caterpillars should seize the period when the insects are still in the early stages and control their occurrence and development to the greatest extent. Therefore, the emergence of cabbage caterpillars in the field should be closely observed to observe the dynamics, generally in the early cabbage seedlings, there are more than 100 insects in the first half of the cabbage seedlings, there are more than 15 insects in the cabbage tree period, and 100 insects in the rosette period have 50 insects. In the above, over 200 strains of insects in the mature period should have more than 200 insects. There are 5 instars of cabbage caterpillars, and they should fight when they catch 1-3 instar larvae. In addition, Cabbage caterpillars have two peak feedings per day, around around 9 am in the morning and around 4 o'clock in the afternoon. At this time, the larvae are active on the leaf surface, and the spraying of pesticides is easy to touch and kill. Farmers can choose the following agents and concentrations: 10% cypermethrin EC 1000 times, or 20% CNDP 2000 times or 30% EC 1500-2000 times. These insecticides are low-level, fast-acting agents that are effective against Pieris rapae. In order to slow the development of drug resistance, several different types of insecticides should be used alternately. Third, the locusts: To suck the vegetable sap, cluster damage, and the locust is still a variety of vegetable virus disease virus mediators, is the vegetable field often need to control an important pest. The locusts that are harmed on cruciferous vegetables mainly include peach aphid, kale, and radish sprouts. They can be used as anti-influxes. The domestic formulation is 50% wettable powder, which is 4,000 times. This imported insecticide is called a group to avoid the aphids. Fog 25% water dispersible granules, using a concentration of 2000 times; 50% wettable powder 4000 times, or imidacloprid, domestic 10% imidacloprid wettable powder 1000-2000 times liquid control, have a higher control effect. Fourth, yellow striped jump. Yellow hop beetle is an important pest in the cruciferous seedling stage. Their larvae live in the roots of the soil, and the adult worms damage the leaves on the ground. These insects have a hard surface and are good at flying and jumping. Therefore, it is very difficult to control with drugs. In our county, the occurrence of yellow worms in the spring is more serious, and the effect of irrigating and controlling larvae is better. The use of 50% phoxim EC may be 1000 times. Liquid, or 10% imidacloprid wettable powder 1000 times, or 25% quinoline EC 1000 times, can be effective for more than half a month. V. Underground pests. The main species are earthworms, cockroaches, ground tigers, golden needles, and root grasshoppers. Since they are harmful to underground activities, they are not easily noticeable. Therefore, vegetable fields that are seriously endangered by soil pests in the past years and when tilling or transplanting soil before sowing or transplanting If a large population of insects is found, chemical control should be taken. Generally, when sowing and hoeing are conducted before sowing, the following agents may be used to spray on the soil surface: 5% trichlorfon powder (2 kg/mu), or 5% carbaryl powder (2 kg/mu), etc. Tillage turned into the soil or with the water infiltrated into the soil; killed after emergence, the following agents were used to irrigate root: 50% phoxim EC 1000 times, or 90% crystal trichlorfon 1000 times, or 10% imidacloprid wettable powder 1000 times liquid, etc., can generally hold effect for 7-10 days, can have a certain degree of control of pests.