Prevention and control of red spider, an insect pest of perilla

Perilla, alias: Cassia, Baisu, Chisu, etc.; annual herb of Labiatae. With specific fragrance, the leaf blade is wrinkled and curled, complete and oval when flattened, 4 to 11 cm long and 2.5 to 9 cm wide, apex long or acute, base rounded or broadly cuneate, margin rounded or broadly cuneate, both sides purple or upper green, lower surface with many concave glandular scales, petiole 2 to 5 cm long, purple or purple-green, crisp. The twigs are purple-green, with marrow in the middle of the section, fragrant air and slightly pungent taste. Perilla leaves can disperse surface cold, strong sweating power, used for wind-cold symptoms, see aversion to cold, fever, no sweat and other symptoms, often used with ginger; if the symptoms are both qi stagnation, it can be used with Rhizoma Cyperi, tangerine peel and so on. Perilla leaves in Xingqi width are used for spleen and stomach qi stagnation, chest tightness and vomiting. Originated in China, mainly distributed in India, Myanmar, Japan, North Korea, South Korea, Indonesia and Russia and other countries. There are wild and cultivated species in North, Central, South China, Southwest China and Taiwan Province.

Perilla has strong adaptability, lax soil requirements, good drainage, sandy soil, loam, clay loam, front and back house, ditch edge, fertile soil cultivation, good growth. Vegetables are the best crop in the previous crop. Fruit trees can be planted under young forests. Perilla is commonly used in traditional Chinese medicine in China, while the Japanese are mostly used in cooking, especially when eating sashimi. It is also used as a vegetable or tea in a few parts of China. Perilla leaf, also known as perilla leaf, has the function of relieving cold, promoting qi and stomach. It mainly treats cold, cough, fullness of chest and abdomen, nausea and vomiting. Seeds, also known as perilla, have the functions of relieving cough, relieving asthma and expectorant. Perilla whole grass can be distilled perilla oil, the seed oil is also known as perilla oil, long-term consumption of perilla oil has obvious efficacy in the treatment of coronary heart disease and hyperlipidemia.

Prevention and control of red spider, an insect pest of perilla

Perilla red spider harm symptom: red spider harms perilla leaves. The peak occurs from June to August when the weather is dry, high temperature and low humidity. Red spider adults are small, usually red and sometimes yellow. The red spider gathered on the back of the leaf to suck the juice, and the small yellow-white spot appeared at the first time, and then a large yellow-brown focal spot could be seen on the leaf surface. After expansion, the whole leaf yellowed and lost green, and the leaves often fell off.

Control methods of perilla red spider:

① collects fallen leaves and burns them in the field during harvest, and removes weeds from ridges, ditches and roadsides in early spring.

During the onset of ②, 40% dimethoate emulsion was sprayed with 2000 times as early as possible. However, it is required to stop spraying half a month before harvest to ensure that there is no residual poison on the medicinal materials.

(3) from July to September, the larvae of Spodoptera litura damaged perilla, the leaves were bitten into holes or lacerations, and the mature larvae pupated as thin silk cocoons on the plant. Control method: spray with 1000 times liquid of 90% crystal trichlorfon.