The appearance is tan, and the cork is red-brown at the flaking; there are intermittent stripes on the branches, nodules are enlarged, and the shape is like a bead. Most of the hard and delicate roots and fibrous roots are born, and some surfaces are smooth and smooth, such as stalks. It is commonly known as "crossing the river branches" or "crossing bridges"; there are brown scales on the upper part, and there are residual stems or petioles that have not been cleaned at the top. The quality is firm and hard, the section is irregular, the skin is dark brown, the wood is golden, the rays are cracked, the central pith is red and yellow, and occasionally hollow. Odorless, very bitter taste, chewing saliva can be dyed red and yellow. It is better to use fat, beaded, solid, red-yellow, no residual stems and fibrous roots.
Valuable Medicinal Plants,Nature Chinese Herbs Radix Coptis,Coptis Chinensis Root Extract,Crude Medical Coptis Chongqing Taisun Pharmaceutical Co., Ltd. , http://www.taisuncoptis.com
The adult worms were 7 mm in length and 15 mm in length. They were grey-brown in color; the front fins had three white horizontal ripples, and the middle had a dark brown kidney-shaped spot with a white edge; the hind wings were greyish white. The mature larvae are 12 to 14 mm in length, black on the head, yellowish on the ankles, and indistinct gray-brown longitudinal stripes on the back of the body. Adult phototaxis is not strong, flying power is weak, eggs spawned on young leaves of the seedlings, an average of 200 female eggs per female can lay eggs, egg development period of 2 to 5 days. Newly hatched larvae damage latent leaves. After the second instar, the leaves are pierced and the third instar silk is conjugated to the heart. When the leaves are fed, the leaves die and no new leaves can be extracted. From 4 to 5 years old, the leaves or petioles can be removed. Into the stem marrow or root. The larvae have the habit of transforming the plants. If the plants are spread densely, the more damage the plants will have.
Control methods: adults and second-instar larvae, white kung-fu or red arrow can be used 1500 times, or 1500 times or 1500 times to prevent it; it is recommended that the third-instar post-larvae, that is, after silkworm scab, should be based on the above-mentioned agents. Adding a potency-enhancing agent and a 40% dimethoate 1000 times solution to prevent and treat.
Identification and Prevention of Vegetables
Vegetable worms are also known as borers and borers. The vegetable seedlings in the city from September to October each year are heavier. The main hazard is the leaves near the heart or leaves of the young plants such as greens, radishes, cabbage, cabbage, and rapeseed, which cause the lack of heart and stop the growth or wilting death. After injury such as cabbage, cabbage, etc. can not be covered.