What if there are worms in the blue grass?

It is a "scale worm". Scale insects are one of the most common pests that harm orchids. Also known as scale insects, commonly known as "blue lice", is the most common and stubborn pest on orchids. There are many kinds of scale insects that harm orchids, such as scale insects, scale insects and white scale insects. It is extremely harmful to Cymbidium hybridum, Cymbidium hybridum and Cymbidium hybridum. Insects are grayish black, milky white or black. The worm is small, with a length of 1.2 ~ 1.5 mm and a width of about 0.25 ~ 0.5 mm. Nymphs hatched from eggs crawl everywhere from May to June every year. If the nymph crawls for about two days, it will be fixed on the host, mainly parasitic on the stems and leaves of bluegrass, and also visible on the petiole and the membrane sheath at the base of pseudobulb, feeding on plant juice. When the damage is light, the organs will turn yellow and age, which will affect the growth of the orchid. When it is heavy, it will cover the leaves in pieces, which will not only consume nutrients, but also affect the photosynthesis of the orchid, thus hindering the growth and development, failing to blossom and bear fruit normally, and even appearing dead leaves and fallen leaves until the whole plant dies. At the same time, the wound invaded by scale insects is easy to be infected with virus, and the secretion of scale insects is easy to cause black mold. Scale insects have strong reproductive ability and can reproduce 2 ~ 3 generations a year. In a fixed life, nymphs secrete a layer of wax shell to protect themselves. General pesticides are difficult to enter and control. Once they happen, it is not easy to clean up. Control method: (1) When a small number of scale insects occur, you can brush them lightly along the leaves with a soft toothbrush, a hairbrush or a small brown brush, or you can scrape off the insects with thin bamboo pieces and rinse them with clean water. (2) Prevention first. When buying bluegrass, carefully observe whether there are scale insects in the seedlings. Secondly, because scale insects are the most harmful from May to September, they often occur in the environment where orchids are too humid and stuffy and poorly ventilated. Therefore, daily management should pay special attention to environmental ventilation to avoid excessive humidity. (3) When using drugs to control nymph, it should be done when nymph has not formed wax shell for a long time. The pesticides used can be dipped in absorbent cotton or gauze with a ratio of 1 5, or 500 times of washing powder or essential balm, 40% dimethoate or 25% chlorpyrifos or 80% dichlorvos 1 0,000, or culled quickly. You can also spray 1 ~ 3 times with "Kang Hua1"and "Jack Ling" continuously, with an interval of 7 ~ 10 days each time, and the effect is better. In addition, we should pay special attention to the fact that scale insects are prone to drug resistance, so we should master the concentration of pesticides and use them alternately. Picture: /i? tn = baiduimage & ampct=20 1326592。 cl = 2 & amplm=- 1。 fr = & amppv = & ampic=0。 z = 0 & ampse = 1 & amp； word = % BD % E9 % BF % C7 % B3 % E6 & amp； s=0#pn=42