1 Starscream: Mostly occur in places with strong light, dry operation and high temperature. Breeding is fast, and 14 years old and 18 generations can be cultivated in the following year. The damage is serious. The damaged plants have yellow leaves or produce necrotic plaques. Complete loss of ornamental value, and some even the death of the whole plant.
Control measures: Note 惫 ventilation and water spray to increase the humidity; such as a few pots less available artificial scrub; the number of more use 40% = killing drunk, 80% dichlorvos or 40% omethoate 1000 times spray, anti-effective.
2 leafminers: Diptera. Paphiopedilum and Paphiopedilum are the most affected. The larvae can eat leaf flesh under the leaf epidermis, destroying the leaf tissue, and affecting the viewing. The damaged parts are prone to black rot and cause rot of the entire leaf and plant.
Prevention and control measures: In the early stage of larval damage, spray with 40% omethoate, 80% dichlorvos or 25% imidophos 1000 times, spray once every 7 days or so, spray 2 times or 3 times. it is good.
3 Whitefly: Small in size, with powdery material throughout the body, and relatively thin cuticles of orchid leaves are susceptible to damage. Leaves the leaves yellow. Brown rot occurs in the wound area, and even the whole plant is dead. The whiteflies have strong fertility and can form large numbers in a short period of time. Because the body is covered with white waxy powder, it has brought difficulties to control. Common species are: whitefly, blackthorn whitefly, orange green mealybug, tangerine mealybug.
Prevention and control measures: spraying 2.5% arachis vinegar, 20% killing diclofen 2000 times; or 40% dimethoate 800 times, 80% dichlorvos 800 times 1000 times, 50% malathion 800 times Good control effect.
4 snails and shrines: activities out at night. When eating the young leaves, young roots, and flowers of orchids, they can consume whole orchids and caterpillars for one night.
Prevention and control measures: Use raccoon skin to mix and kill trichlorfon for poisoning in places where they are often active; spray pesticides such as trichlorfon around the orchids, pedestals and flower pots, or remove lime around pots. All have better control effect. Salt can also be placed in a sand net bag, placed on the feet of the flower rack; salt can be sucked into the body of water to make it dead. This method is simple, effective, and good; if the number is minimal, manual killing can be performed at night or early morning.
5 Orchid anthrax: An important disease of orchids. At the early stage of disease, the leaves developed round and dark brown lesions. Afterwards, the edges gradually darkened, and the center was grayish brown. The lesions were easily disintegrated. In severe cases, the lesions are numerous and the leaves are yellow.
Prevention and control measures: (1) cut off diseased leaves, remove diseased bodies, and burn them together; (2) pay attention to ventilation and light transmission; (3) cultivate robust plants, reduce incidence, prevent over-watering, and especially avoid directly spraying plants (4 ) The diseased plants can be sprayed with 50% benzoate and 70% thiophanate or 50% carbendazim 600-800 times, once every 10 days, and even sprayed 3 times and 4 times. The control effect is quite good.
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