How to prevent and cure grubs by planting astragalus membranaceus?

The medicinal use of Radix Astragali has a history of more than 2000 years. Due to long-term mining, the number of wild Radix Astragali has decreased sharply in recent years, which is in danger of extinction. For this reason, it is determined that the plant is a gradually endangered species and a third-class protected plant in the country. Therefore, the artificial cultivation of Radix Astragali is essential, but for the cultivation of Radix Astragali, how to control grubs is a headache.

Grubs are the larvae of beetles, also known as white silkworms and walnut worms. Adults are commonly known as beetles or beetles. Harms a variety of plants and vegetables. According to its feeding habits, it can be divided into three types: herbivore, fecal herbivore and saprophyte. Herbivore is a worldwide underground pest with a wide range of feeding habits, which harms a variety of crops, cash crops and flower seedlings, and likes to eat seeds, roots, tubers and seedlings that have just been sown.

The occurrence of grubs in Astragalus membranaceus is serious, and the insect body of grubs is larger. The vertical movement of grubs is mainly related to soil temperature, and the average optimum soil temperature of grubs in crop plough layer is 13 ℃ ~ 18 ℃. From late October to early November, when the soil temperature continues to drop, dive to a soil layer of 30cm to 50cm to make a soil chamber to survive the winter.

Prevention and control methods:

1. Agricultural measures.

Combined with deep turning fine rake, crop rotation and weeding, a large number of grubs in the soil can be killed.

two。 Artificial prevention and control.

Every year in spring ploughing and autumn ploughing, grubs are picked up with the plough and can be used as poultry feed.

3. Chemical control.

As grubs live in the soil all their lives, the key to chemical control is that the pesticide must be applied into the soil in order to achieve a better control effect.

(1) seed dressing: this is the most economical, simple and effective method to control grubs. The commonly used agents are phoxim and chlorpyrifos, which are weighed according to 0.2% of the seed weight, diluted with an appropriate amount of water, mixed with the seeds and stuffed for half a day before sowing.

(2) soil chemical treatment: before sowing, use 15% Doxin granule 300g to 500g per mu, spread it evenly on the surface after mixing the soil, and then mix it into the topsoil. Or 500 grams of 50% phoxim EC per mu, diluted with water, mixed with 50 kg of fine sandy soil, sprinkled on the surface, mixed into the soil before sowing.

(3) treatment of sowing ditch with arsenophos: 500 grams of 50% phoxim EC per mu, diluted with appropriate amount of water, mixed well with 20 kg fine sandy soil, applied in the sowing ditch, and then sowed. Or use 10% methamidophos granules 4 kilograms per mu, sprinkle the ditch, cover the soil, and then cover the soil after sowing.

The above is about the traditional Chinese medicine astragalus how to control grubs, but it is worth mentioning that although grubs are a pest for planting astragalus, grubs themselves can also be used as a kind of traditional Chinese medicine. According to relevant medical records, grubs have the effects of breaking blood, removing blood stasis, dispersing knots, and dredging breasts, and are used to treat broken stasis pain, gout, tetanus, throat arthralgia, eye nebula, erysipelas, carbuncle and hemorrhoids. But the grub itself has a certain degree of toxicity, and medicinal only part of the species, so we must not take their own oh.