Prevention of orchid root disease

Orchid roots, long in the matrix inside, people not only can not directly observe whether it is harmful to disease, but also not often from the seedling inspection. When the leaves show symptoms, the patient has been anointed blind, more difficult to treat. Therefore, preventive work must be done to prevent Langen disease before it occurs.

(i) Serious planting

① The seedlings should be thoroughly removed from disease spots and lesions, and strictly disinfected.

(2) Planting in high-tube porous orchid pots.

③ The culture medium should be appropriately rough and disinfected.

④ The operation of upper basin should be standardized.

b) careful management

① timely and appropriate irrigation and fertilizer, try to avoid damage, dry damage and fertilizer damage.

② Timely heat preservation, antifreezing, cooling and moisturizing, creating all-round ventilation and ventilation and often sufficient scattered light environmental conditions.

③ To strengthen nutrition, to ensure that the orchid root is very needed phosphorus, calcium, chlorine, molybdenum, boron and other elements of nutrition timely and sufficient supply, promote the healthy growth of orchid root. If chlorine, molybdenum and boron are lacking, the transport function of orchid roots for nutrients and water will decrease, the growth points of roots and buds will die, and flower buds will be difficult to open; lack of phosphorus and calcium, root growth will be hindered, and the function of absorbing water and nutrients will also decrease. Therefore, in addition to spraying trace elements from leaves, compound trace elements or fertilizer containing the above elements should be applied to orchid roots once a season. Its use concentration is generally 0.02% to 0.05%.

(3) After spring warming, select aspirin 3000 times solution that can induce resistance protein to prevent, kill or inhibit human invasion and spread of pathogenic microorganisms, and spray it once on orchid plants. After half a month, pour Shihua Yi brand orchid bacteria king 500 times solution once to improve the immunity of orchid root.

(4) pest control and epidemic prevention

① Exterminate cockroaches, ants and other insects that directly harm orchid roots and spread pathogenic bacteria.

(2) The watering method must be used to apply pesticide to the orchid plant. Spring, summer and autumn are usually applied once each. Commonly used for root watering fungicides are ethyl phosphine aluminum and carbendazim 800~1000 times solution, tuijunte, dexone, can kill, green bang 98, carmeton 600~800 times solution, and penicillin, streptomycin, chloramphenicol and other 3000 times solution. (Xu Dongsheng)