Prevention and control of bacterial soft rot of orchids (practice) _ flower clinic

The main pathogen of bacterial soft rot is Erwinia carotouoraE. The peak of the disease is the rainy season when the new buds are unearthed. The brown watery spots appeared at the base of the infected young leaves, and the disease spots expanded rapidly, closely connected into pieces, and spread to the growth points of leaf sheaths and buds at the same time. Leaves that are about to mature are also often infected and endanger pseudobulbs. The infected leaves rot and give off a foul smell at the base and dehydrated folds in the upper part.

This disease can harm all species of national orchid and Cartland, Oncidium, Magnolia, Phalaenopsis, Magnolia and so on. The disease is more serious in southern China. The leaves and pseudobulbs of orchids were mainly harmed. The leaves were watery spots at the beginning of the disease, then gradually turned brown or nearly black, and expanded rapidly, and finally developed into a soft, foul-smelling rotten block, and secretions flowed out. Spread with Rain Water or watering. If the pseudobulb is infected, there will also be waterlogged spots, brown to black, and eventually the pseudobulb will become soft, wrinkled and dark, and rot quickly.

Bacterial soft rot mostly occurs in the cloudy and rainy season at the beginning of summer and spreads through wound infection, bumps and insect bites, especially in high temperature and rain or poor ventilation, and develops very rapidly, usually making the whole leaf rot within 3-5 days. whether it occurs on old or new leaves, it is quite fatal. In order to prevent and control bacterial soft rot, attention should be paid to keeping the cultivation environment well drained and ventilated and sunny. It is found that the disease spot should be removed and destroyed immediately. If the disease spot develops to the growing point, the whole plant should be isolated with a basin, and try to avoid spraying water supply and use basin surface irrigation instead.

After the patient's tissue is removed, the diseased leaf should be cut off in time, the wound should be smeared with Bordeaux solution, and the orchid plant should be soaked in 0.1% potassium permanganate solution for 5 minutes, washed with running water, exposed to the sun for 15 minutes, and planted after drying. It can also be sprayed with 0.5% Bordeaux solution or 200mg/L agricultural streptomycin or methyl parathion, and all have good results. Depending on the specific situation, regular spraying of 30.3% tetracycline 2000 times, or 10% chain tetracycline 1000 times, or 68.8% more than 1000 times of streptomycin has significant preventive and therapeutic effects.

At the same time, I hope that Lanyou, who has been harmed by "bacterial soft rot", will get rid of the "sea of suffering" as soon as possible.