Causes, symptoms and chemical control methods of orchid pests and diseases

┌────┬─────────┬─────────┬─────────────────────┐ │Pest/Disease Name│Lesion Condition │Cause │Examples of Chemical Control │ ├─┬──┼─────────┼─────────┼─────────────────────┤ │Pe│Ap│Black spots and white │Mostly occurs on tender │Bilin (packet) diluted with 20 jin of water for spraying, Haopingdong diluted │ │st│hi│spots appear on leaf │buds in warm spring. │3000 times with water, dichlorvos diluted 800 times for spraying, oxidized │ │ │d │surface; species include │ │fruit etc. can also be used. │ │ │ │peach aphid, cotton │ │ │ │ │ │aphid, black aphid, etc. │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Mi│Soft-bodied small │Plants too densely │Bamanteling diluted 2000 times with water, Shamansong diluted 1000 │ │ │te│animals, eggs white │planted, occurs at │times with water; in addition, spraying with soaked tobacco water or oleander │ │ │s │in color; species include │temperatures above │leaf and branch juice is also effective. │ │ │ │red spider mite, mite │20 degrees │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Sc│Brown round black spots │Caused by poor │Subisha diluted 1000 times with water, dimethoate soluble powder diluted │ │ │al│and streak marks on the │ventilation and long-term │with water 1000-2000 times, in addition, cleaning with beer │ │ │e │underside of leaves. │excessive moisture │is also effective. │ │ │in│ │ │ │ │ │se│ │ │ │ │ │ct│ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Th│When infested, small │Appears when the │Shamiejuzhi diluted 2000 times with water, lindane, 1605 etc. diluted │ │ │ri│white spots appear on │climate is warm │can all be used. │ │ │ps│the leaf surface, │ │ │ │ │ │damaging the epidermis. │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Wh│A layer of white waxy │Occurs in hot and humid │Jiuxiaolin diluted 2000 times with water, puchuling diluted for spraying (for │ │ │it│powder on the surface │seasons │specific details see instructions) │ │ │ef│ │ │ │ │ │ly│ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Ot│Ants, snails and the │ │Ant-killing chemicals, cockroach chemicals, or placing dichlorvos │ │ │he│like │ │or lime powder outside the flower pot. │ │ │rs│ │ │ │ ├─┼──┼─────────┼─────────┼─────────────────────┤ │Di│Vi│Black spots or streaks │Mother plant carries the │20% virus A diluted with 500-700 times water for spraying, 28% │ │se│ra│appear on leaves, │pathogen or flower pot, │xiaojunling diluted 1500 times with water; once diseased plants are found, burn them immediately, │ │as│l │gradually enlarging and │tools not properly │clean tools, prevent contagion, pay attention to ventilation, prevent high │ │es│Di│dying. │disinfected; also spread │temperature. (According to data, Taiwan, China's "Peilusu" and "Lanjiasu"│ │ │se│ │by insects, or │have relatively good efficacy) │ │ │as│ │waterlogging too long │ │ │ │e │ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Bl│Brown disease spots │Watering too frequently, │Xinwansheng powder diluted 600 times, copper sulfate, thiophanate-methyl, │ │ │ac│appear on the leaf core, │too much water │carbendazim etc. can all be used after dilution. │ │ │k │then enlarge like water │accumulating in the leaf │ │ │ │He│soaking and turn black. │core. │ │ │ │ar│ │ │ │ │ │t │ │ │ │ │ │Di│ │ │ │ │ │se│ │ │ │ │ │as│ │ │ │ │ │e │ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │An│Brown spots appear on │Occurs during the rainy │Thiophanate-methyl diluted 800 times with water, 65% zineb powder │ │ │th│the leaves and base, then │season or moldy rainy │diluted 600 times with water, 50% carbendazim diluted 1000 times with water for spraying. │ │ │ra│enlarge into semicircular │periods. │ │ │ │cn│or circular shapes. │ │ │ │ │os│ │ │ │ │ │e │ │ │ │ │ │Di│ │ │ │ │ │se│ │ │ │ │ │as│ │ │ │ │ │e │ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Wh│White mycelium on the │Soil carries the pathogen, │Beideli diluted 1000 times with water, Xunkelin diluted 2000 │ │ │it│soil surface and base, │invading the interior of │times with water, pentachloronitrobenzene diluted 500 times with water; pay attention to burning │ │ │e │later turning chestnut │leaf buds, causing root │diseased plants and replacing the soil. │ │ │Mu│and blue sclerotia. │rot. │ │ │ │ld│ │ │ │ │ │/D│ │ │ │ │ │am│ │ │ │ │ │pi│ │ │ │ │ │ng│ │ │ │ │ │Di│ │ │ │ │ │se│ │ │ │ │ │as│ │ │ │ │ │e │ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Br│Brown spots appear on │Caused by stimulation │Mancozeb diluted 700 times with water for spraying; the above several │ │ │ow│the leaves, gradually │from too-cold wind and │disease chemicals can also be used. │ │ │n │changing to black patches, │too-cold water. │ │ │ │Ru│causing the leaves to │ │ │ │ │st│die. │ │ │ │ │Di│ │ │ │ │ │se│ │ │ │ │ │as│ │ │ │ │ │e │ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │So│Water-soaked spots first │Rainwater or the water │Kesade diluted 600 times with water, Bordeaux mixture, thiophanate │ │ │ft│appear on the leaves, │used for watering carries │and other chemicals can all be sprayed after dilution. │ │ │Ro│turning black with │the pathogen │ │ │ │t │secretions │ │ │ │ │Di│ │ │ │ │ │se│ │ │ │ │ │as│ │ │ │ │ │e │ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Le│At first the new buds │Excessive rain, causing │Lufenwei No. 2 diluted 7000 times with water, 0.01% boric acid solution, │ │ │af│look as if scalded by hot │boron deficiency. │dikushuang, disulfur phosphorus etc. sprayed after dilution. │ │ │Sp│water, later turning │ │ │ │ │ot│dark brown patches │ │ │ │ │Di│ │ │ │ │ │se│ │ │ │ │ │as│ │ │ │ │ │e │ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Po│On the leaves like flour │Caused by fungi, too │Bordeaux mixture, copper sulfate, lime milk, thiophanate, carbendazim │ │ │wd│sprinkled │humid │etc. are all effective after dilution. │ │ │er│ │ │ │ │ │y │ │ │ │ │ │Mi│ │ │ │ │ │ld│ │ │ │ │ │ew│ │ │ │ │ ├──┼─────────┼─────────┼─────────────────────┤ │ │Ot│Mild diseases such as │Control water amount and │Apply "cortisone acetate" ointment, spraying with leek juice is also │ │ │he│localized rust spots on │pay attention to │effective. │ │ │rs│leaves │ventilation │ │ └─┴──┴─────────┴─────────┴─────────────────────┘ Lu Qiju