Introduction: Vegetable green insects nibble on cabbage and radish, from the perspective of food safety, vegetable farmers if they do not want to use pesticides and want to kill insects, may wish to try several practical measures, both convenient and easy to use.
When it comes to the vegetable green insect, which is a farmland pest, not only is every vegetable farmer familiar with it, but even ordinary farmers will be quite impressed by it, just because it is too annoying.
Every year in the spring and autumn, it is a good time for farmers to grow greens, cabbage and small turnips or large turnips. Vegetable insects also occur heavily in spring and autumn every year, causing harm to cabbage, rapeseed, small radishes planted by farmers in early spring, or cabbage, radish, cauliflower and other vegetables sown in autumn.
The young larvae of the vegetable worm will eat the leaf flesh of the infested vegetable, leaving only the transparent skin. After the 3rd instar, the green insect will not only enter the binge eating period, but also eat the entire vegetable leaf, leaving only the leaf veins. On the one hand, it will affect the cabbage heart and the growth of green vegetables, on the other hand, the green worms will also leave a large amount of insect feces on the vegetables that are eaten by them, polluting vegetable leaves, flower buds or bulbs, and reducing the quality of vegetables.
Vegetable farmers and ordinary farmers who want to kill vegetable insects can of course choose to use the corresponding insecticides. However, when using any pesticide, pay attention to the interval between medications. But even if this is the case, it is difficult to ensure that there will be no residues on vegetables that have been used with pesticides.
From the perspective of food safety, vegetable farmers or ordinary farmers who want to kill vegetable insects without spraying pesticides can use 4 kinds of easy access, and they are also efficient in killing vegetable insects, and their plant-derived insecticidal components are easy to decompose, and will not form residual plants, and they can be controlled directly by taking their clear solution spray after soaking water such as their leaves or root skins. The four plants are tobacco, ailanthus, quinoa and fish vine.
Some people may say, what are you talking about? Tobacco and ailanthus are more common in the countryside, but we don't have the two plants of quinoa and fish vine in the local area, where do you start with this "easy to get", and where do you let us find this "easy to get" thing?
I admit that the distribution range of quinoa and fish vine in China is not wide, but quinoa and fish vine are both Chinese medicinal herbs, which you can easily buy from the local Chinese medicine store.
Tobacco can be directly used in insecticide, dry tobacco can be boiled in water or soaked water spray, can also be ground and used for spraying powder, while fresh tobacco of course can only be soaked in water spray.
Tobacco can not only kill the agricultural pests of chewing mouthparts such as vegetable green worms, small cabbage moths, and leaf curls, but also kill aphids, thrips, planthoppers, tsubaki elephants and other stinging mouth organ pests, and at the same time can also treat rice field ants.
Tobacco can be used for insecticide because tobacco contains an alkaloid (that is, nicotine), which has a touch killing, fumigation and gastric toxic effect on pests. The rate of insecticide after tobacco use is fast, but the duration of the effect is relatively short. However, this is an advantage for vegetables that need to be harvested and marketed at any time.
Spray tobacco powder to kill insects, and 2-3 kg of tobacco powder can be used per acre. If you choose to spray, you can generally use 1 kg of foreign tobacco leaves per mu, or the same weight of coarse crushed tobacco stems, tobacco tendons add 10-20 liters of water, soak and filter out the tobacco residue, use leaching liquid to directly spray to control the chewing mouthpiece of the green worms and so on. If you want to control the pest of the stinging mouthpiece, you should use lime water to soak the tobacco. No matter what kind of tobacco extract needs to be used with the bubble, because the nicotine component in it is very volatile.
Ailanthus was originally known as Quercus alba, also known as Tsubaki and Xylaria, is a deciduous tree of the genus Ailanthus in the family Cinnamomycea, named because of the glandular spots at the base of its leaves that emit odors.
Ailanthus is distributed in the Yellow River Basin and can be seen in most parts of the country. The reason why Ailanthus can volatilize a special odor is because Ailanthus contains chemical components such as Ailanthus Keloid, Ailanthus Razaki Lactone, Acetyl Ailanthus Cinnamon Lactone, Picolignin, neocarin, etc., and can be emitted through the touched leaf glands.
Ailanthus thrematone, also known as Ailanthus ketone or quercus albacethone, belongs to a pentacyclic diterpene lactone compound, with a variety of biological activities, has a strong bactericidal and insecticidal effect. The use of Ailanthus leaves and root bark soaking water spray can also be used to kill vegetable insects. If you can add other plant-derived insecticidal ingredients, the insecticidal effect will be better after use.
Quinoa is a perennial herb in the lily family, which is distributed in Northeast China, Hebei, Shandong, Henan, Shanxi, Shaanxi, Inner Mongolia, Gansu, Hubei, Sichuan and Guizhou.
The quinoa alkali contained in quinoa has a good insecticidal effect. Quinoa alkali itself can be made into a bio-derived insecticide, and the toxicity to humans and animals after use is very low, and there are few residues that will not pollute the environment.
The white root quinoa in quinoa contains more quinoa alkali, and it is efficient to control vegetable insects by spraying on radish and cabbage after dilution of boiling water.
After using the liquid spray after soaking the water of quinoa, the active ingredient will pass through the epidermis of the insect body such as the green worm or after being eaten by the insects such as the green worm into its digestive system, and thus cause the reflex excitement of the pest body, first by inhibiting the sensory nerve endings of the worm body such as the green worm, and then by inhibiting the central nervous system of the pest such as the green worm and causing its death. Spray once, the insecticidal effect can be maintained for about 10 days.
Fish vine is a perennial vine of the legume family, mainly distributed in Zhejiang, Fujian, Taiwan, Guangdong, Hainan, Guangxi and other places.
Fish vine contains fish vine, fish vine, gray edamame essence and toxin gray leaf phenol, etc., these ingredients have insecticidal effects. Among them, fish vine is a kind of insecticidal active ingredient in the root of fish vine plant, and the hairy fish vine cultivated in Guangxi, Guangdong, Hainan, Fujian and Taiwan in China contains 6%-7% of fish vine, and the highest content can reach 13%. Wild fish vines in the areas where fish vines are distributed are also valuable natural biological insecticide resources that can be directly utilized.
Rotenone has a strong gastric toxicity and touch killing effect on pests, and is easy to decompose after use without residue. Sprayed after soaking in water, it can be used to control vegetable pests such as vegetable insects, small cabbage moths, aphids, ape leaf insects, yellow striped jumping beetles, twenty-eight star ladybirds, and yellow melons.