How to control pests on Cymbidium kanran? These methods you need to master

1. Scale insects: Scale insects are also known as coccids. They mainly parasitizeorchidleaves, more on the underside than the upper surface, and are also found on leaf stalks and on the membranous sheaths at the base of pseudobulbs. They feed by suckingorchidsap. The adults are covered with a white or otherwise colored secretion, namely the scale, and remain in a fixed position, continuously sucking nutrients from within theorchid. In mild cases they affect orchid growth. In severe cases they cover the leaf surface in patches, exhausting the orchid's nutrients and also affecting photosynthesis, causing the orchid to grow weak, fail to bloom normally, and even wither, drop leaves, and die. To control scale insects, mainly improve the environment, especially ensuring ventilation and avoiding excessive humidity. For control methods, you can use a toothbrush to remove the insects from the leaves, but more importantly, spray 3-4 times when the nymphs hatch. Each spray should be 5-7 days apart, using the following pesticides: 40% dimethoate or omethoate (emulsifiable concentrate) at 1000 times dilution. Yibianjing 10% imidacloprid wettable powder at 1500 times dilution. Actara 25% water-dispersible granules (manufactured in Shanghai) at 1000 times dilution. Also, after brushing off the insects, spraying with 1000 times diluted essential balm also gives good results. 2. Mites: Mites are small, resembling red spiders, and are not easily noticed. The mites that harmorchidflowers mainly belong to the Tetranychidae family. Mites use their sharp stylets to pierce through the leaf surface and spongy tissue layer into the leaf tissue, sucking out chloroplasts from the palisade layer cells and extracting cell contents, causing the affected cells to dry up and the remaining contents to congeal into clumps. In severe cases, this layer of cells collapses, epidermal cells necrose, and this causes an imbalance in the orchid plant's water balance, accelerates transpiration, weakens photosynthesis, and affects the orchid's normal development. To control mites, generally spray pesticides during the adult and nymph stages: 20% dicofol (emulsifiable concentrate) at 1000 times dilution. 40% omethoate emulsifiable concentrate at 1000 times dilution. 75% propargite (emulsifiable concentrate) at 1000-1500 times dilution. 3. Aphids: Aphids are also common pests that harm orchids. They damage tender leaves, buds, flower buds and other young organs, using their piercing-sucking mouthparts to pierce into orchid tissues and suck out large amounts of sap and nutrients, causing nutritional deficiency in the orchid, disrupting the balance of growth and development, and producing leaf spots, leaf shrinkage, leaf curling, galls and other deformities. In addition, aphid excrement is honeydew, and when abundant it covers the orchid leaf surface, affecting photosynthesis, inviting mold growth, inducing black mold disease, and transmitting harmful viruses. Aphids reproduce quickly, producing several to dozens of generations per year, so timely control is necessary to prevent explosive outbreaks. Commonly used pesticides include: 40% omethoate (emulsifiable concentrate) at 1000 times dilution. 20% fenvalerate (emulsifiable concentrate) at 1000-1500 times dilution. 50% fenitrothion (emulsifiable concentrate) at 1000 times dilution. 4. Nematodes: Nematodes parasitize inside leaves, causing yellow or brown patches to appear on the leaves, leading to necrosis, withering, and even leaf drop. This causes the orchid to grow slowly and develop poorly. When parasitizing flower buds, they cause the buds to dry up; when parasitizing roots, they cause bead-like nodules to appear on the roots. To control nematodes, first eliminate the source of infection. In mild cases, cut off diseased roots or diseased leaves; in severe cases, pull out and burn the entire plant. Drench the growing medium with 40% omethoate at 1000 times dilution. For diseased plants, 2 weeks before transplanting, use 10% fenamiphos granules at 1.5-2 g/sq m, or aldicarb granules at 1.2-5.6 g/sq m, to treat the growing medium, but beware of poisoning to humans and livestock. In addition to the above four types of pests, there are also thrips, leaf miners, whiteflies, ants, snails, earthworms and other insects that can harmCymbidium kanran. It is worth mentioning here that weeds around the orchid garden should also be regularly sprayed to kill insects, to prevent summer afternoon showers from driving miscellaneous insects into the orchid garden, making it a habitat for miscellaneous insects and causing them to spread diseases widely. For this purpose, poison bait or pesticide spraying can be used; the bait can be mixed with dichlorvos, arsenic and other drugs; you can also spray 40% omethoate at 100 times dilution or fenvalerate at 500 times dilution, and you can also spray 50% phoxim or 80% dichlorvos at 1000-1500 times dilution. (Yang Jixin, Wuyishan City Orchid Association, Fujian)