Insecticide for stevia rebaudiana

Abstract

The invention provides an insecticide for stevia rebaudiana. The insecticide is prepared from raw materials in parts by weight as follows: 20-25 parts of pyrethrum, 5-8 parts of tobacco stems, 25-30 parts of nerium oleander, 12-16 parts of macleaya cordata, 10-15 parts of atropa belladonna, 8-14 parts of lycoris radiate, 8-12 parts of jequirity beans, 13-17 parts of wisteria, 15-20 parts of stemona, 12-18 parts of radix aconite and 18-26 parts of phytolacca acinosa. The insecticide is obtained by combining the raw materials after the raw materials are extracted. The insecticide for stevia rebaudiana is prepared from plant raw materials, has the advantages of being green and safe, free from causing pesticide resistance, low in environment pollution and the like and has a good control effect on insect damage of stevia rebaudiana.

Description

technical field [0001] The invention relates to the technical field of stevia planting, in particular to an insecticide for stevia. Background technique [0002] Stevia is a perennial herb of the genus Stevia in the Asteraceae family. The whole Stevia plant contains sugar, and the sweetness of the leaves is the highest, containing about 14% glycosides. The glycosides of the branches are equivalent to half of the leaves. Stevia leaves can be used as sugar after drying and crushing, or through ethanol precipitation Obtain stevioside, the sweetness is equivalent to 250-300 times that of white sugar, and the calories are only 1 / 300 of white sugar. Not only that, stevioside has no toxic side effects, no carcinogens, safe to eat, regular consumption can prevent high blood pressure , diabetes, obesity, heart disease, dental caries and other diseases, it is an ideal sweetener to replace sucrose. At present, it has been widely used in food, beverage, medicine, daily chemical indust...

AI Technical Summary

Problems solved by technology

[0003] Various pests and diseases are prone to occur during the planting period of stevia. The main pests of stevia during the planting period are aphids, noctuid pests, cutworms and other diseases. Aphids harm the buds and leaves of stevia, causing the leaves to curl, shrink and deform. 1. The plants are short and short, which may even induce mosaic virus disease, which will seriously affect the yield of stevia, especially in dry and rainless weather; the cutworm larvae will cut off the roots and stems of stevia seedlings, which will cause the death of stevia and lack of seedlings The phenomenon of ridge breaking will cost more manpower and material resources; noctuid pests have a wide range of insectivorous habits and large food intake. They bite the leaves of plants with larvae. Leave the epidermis and leaf veins, and noctuid pests above the 4th instar bite the leaves, leaving only the main veins. When the outbreak occurs, the density of larvae is high, and the whole field may be eaten into bare rods, resulting in a complete harvest

At present, chemical pesticides are mostly used for insect pests of stevia rebaudiana, such as 50% phoxim EC 1000 times liquid, 10% imidacloprid wettable powder 1000 times liquid, 2.5% triclosan 1000 times, etc. to kill insects, but long-term use Chemical pesticides will increase the resistance of bacteria and insect pests, resulting in more and more pesticides being applied, and will also lead to more and more serious environmental pollution