Pest control techniques of Polygonum capitatum

Polygonum capitatum belongs to herbaceous plants, stolon, tufted, belonging to angiosperm phylum, Magnolia, Polygonaceae, Polygonum, alias red acid rod, green shadow, stone vegetable, acid pulp grass and so on. The whole herb is used in medicine to treat urethral infection, pyelonephritis and other symptoms. It is the second largest traditional Chinese medicine in Yuping County, Guizhou Province, and its planting area is second only to Shegan. However, with the growing planting area of Polygonum capitatum, the problems of diseases and insect pests are gradually highlighted. Here are four kinds of common diseases and insect pests of Polygonum capitatum and their control measures.

Small land tiger

Alias soil silkworm and root cutter, belonging to the family Lepidoptera, will reproduce 2-3 generations a year, and the larvae will winter in the soil chamber. the first generation larvae are harmful to Polygonum capitatum seedlings in late April and early and middle May, resulting in missing plants and breaking rows, especially the newly planted seedlings are seriously affected by this pest.

[control measures] ① artificial capture: when new broken seedlings are found in the field in the morning, the larvae can be killed by taking out the larvae from the chamber where the seedlings are broken. ② spraying pesticide: spray seedling roots with 59% phoxim EC or 2.5% deltamethrin 2000 times. ③ poisonous soil: mix well with 25% trichlorfon powder 0.5kg fine soil 20kg and sprinkle the seedlings into the soil before they are unearthed.

Double spotted firefly beetle

The leaf beetle, alias, belongs to the family Coleoptera, which produces one generation every year. It lays eggs in late October and overwinters in the soil in the form of eggs. Although the larvae do not hatch until the first and middle of May, the larvae are harmful to the roots of Polygonum capitatum in the soil, which will cause plant wilting and death. The leaves of Polygonum capitatum were pupated in late June and emerged in mid-July. The adults were harmful to the leaves of Polygonum capitatum. The leaves were bitten into holes or lacerations, and the leaves could be eaten up in serious cases. Drought is beneficial to the occurrence of the insect.

[control measures] ① uprooted weeds on the edge of fields, ridges and canals in time, and killed eggs deeply before winter. During the peak period of adult ②, 4.5% beta-cypermethrin 1500-fold avermectin 1500-fold solution could be sprayed once or twice.

Yellow striped jumping beetle

Alias ground flea, flea, vegetable lice, belong to Coleoptera Chrysomelidae, occur 4-5 generations a year, overwintering in the form of adults on stems, leaves and weeds. When the temperature rises to more than 10 ℃, the food intake increases greatly at about 20 ℃, and decreases when the temperature exceeds 30 ℃. At the beginning of April, the eggs were laid in the soil of the plant root, and after hatching, the root epidermis and young roots were eaten, causing the plant to die. In the middle and last ten days of May, adults are harmful to leaves, resulting in many small holes, thus affecting photosynthesis.

[control measures] ① cleans the countryside, removes fallen leaves and weeds after harvest, and buries deeply or buries them. ② larvae were drenched thoroughly with 1000 times of trichlorfon crystal or 2000 times of chrysanthemum horse EC during the damage period. ③ adults were sprayed with 50% phoxim EC 1000 times for 2 or 3 times, with an interval of 10 days.

Spodoptera litura

Alias night burglar, aconitine, belonging to the family Lepidoptera, the insect source is generally immigrated from other places. Four or five generations occur every year, and the larvae are harmful to the leaves, petioles or young stems of crops. They like high temperature and are afraid of cold, so high temperature is an important reason for the outbreak of the insect. The newly hatched larvae clustered near the egg mass, the 2nd instar began to disperse, the 4th instar entered the overeating stage, and the mature larvae pupated on the soil crevice and fallen leaves.

[control measures] ① cleans the countryside and removes weeds and residual branches and leaves in time. ② made use of the phototaxis of adults to install insecticidal lamps in the field to trap and kill. ③ set up sex attractants in the field to trap and kill adults. In the young larval stage, ④ was sprayed with 1000 times solution of insect plague virus 1 or 2000 times solution of 25% diflubenzuron 3.