Disease control of Cymbidium and control of diseases and insect pests of edible fungi

What if the leaves of Cymbidium turn yellow?

There are several situations in which the leaves of Cymbidium are yellow. if the bottom leaves grow new roots from the axils of the leaves, it is a normal metabolism to make the leaves yellow. One situation is that the leaves turn yellow without new roots in the axils of the leaves, mostly due to the soil quality, poor air permeability, too much fertilizer or poor control of watering dry humidity, which may make the leaves of Cymbidium yellow. If the water is impenetrable and the root tip is short of moisture, the leaf tip will turn yellow and dry. If this happens, it must be watered thoroughly. In summer, a small basin of water can sit at the bottom of the flowerpot every 7 times and 10 days. This is called immersion method.

Another situation is that yellow spots of different sizes appear on both sides of the leaves, which is called brown spot. This is mainly due to the relatively healthy soil and excessive fertilizer application. Generally speaking, rotten leaf soil should be used in basin soil, and its air permeability is better, especially in summer, thin fertilizer should be applied frequently, and fertilizer and water should not be dropped on the leaves, so as to prevent the occurrence of spot disease. In another case, due to sufficient sunshine and high temperature in summer, if the magnolia is exposed to the sun, sunburn will occur. The light leaves turn yellow and the heavy ones wilt. Shading should be taken in summer, put in a ventilated place, the degree of shade should be 50%, and the south window of the family can be shaded with a layer of gauze.

What if the root of the gentleman orchid is rotten?

Gentleman orchid seedlings yellow, leaves with macula, may be rotten roots, can break the soil to see. It is found that the rotten roots of orchids, rinse with clean water, soak them in 1/1000 potassium permanganate solution (into lavender) for an hour, rinse with clean water, remove the rotten roots after drying, then apply plant ash to the removed parts, plant new pots, and place them in a 25 ℃ ventilated place. Do not water too much. New roots can grow in about 30 days.