What fungicide works well for orchid stem rot

First take the whole pot of orchids out and wash them clean, cut off the diseased plants, repair the rotted parts, soak them in a sterilizing agent for one hour, dry them in a shady place, mix metalaxyl mancozeb into a paste and apply it to the stem of the orchid, then let it dry. Wrap the pseudobulbs of the orchid with sterilized sphagnum moss, and replant in a new pot and soil.

Orchid stem rot

Causes of stem rot

Orchid stem rot, also called wilt disease and blight, refers to any condition that causes the pseudobulbs of orchids to rot. The peak period for the disease is from May to September each year. Today the editor is mainly talking about stem rot caused by fungi, but regardless of the cause, most cases are triggered by high temperature, high humidity and poor ventilation.

Symptoms of stem rot

The symptoms mainly show as the leaves of the orchid turning yellow starting from the base, and within one or two days they wither and die. The leaves break off as soon as you touch them, and the disease develops rapidly and severely.

At the same time, the surface of its root system is still intact, but the inside has already been infected and turned brown, or even rotted, so the impact of stem rot on orchids is very great.

Prevention and control of orchid stem rot

For orchid stem rot, the most important thing is prevention, followed by remedial treatment.

Prevention of stem rot

Summer and autumn are the periods when the disease easily occurs, with a hot, rainy climate and high humidity, making orchids highly susceptible to infection by pathogens. Therefore, open the windows more for ventilation to ensure air circulation. Do not let the potting soil become too wet, and use more organic fertilizer.

In addition, sterilization and disinfection should be done frequently. Starting from May, you can spray the whole orchid plant and the surrounding environment weekly with special fungicides such as carbendazim and jun du qing. The main focus is sterilizing the surroundings, and the leaf surfaces can be sprayed a little less.

Treatment of stem rot

For orchids that have already been infected with stem rot, first take the whole pot of orchids out and wash them clean. Then cut off all the diseased plants and use a blade to repair the rotted parts.

Put the orchid into a sterilizing agent and soak it for at least one hour. Then place it in a shady place to dry.

Then mix metalaxyl mancozeb into a paste and apply it to the stem of the orchid, then let it dry.

Finally, you can wrap the pseudobulbs of the orchid with sterilized sphagnum moss, and replant in a new pot and soil.

Note: after replanting, do not water immediately, and do not expose it to the sun; place it alone in a ventilated place. After three days, you can water it thoroughly with streptomycin mixed with clean water. After that, soak the whole plant in a sterilizing agent once every month.

Fighting orchid stem rot is a task with a heavy responsibility and a long way to go, fellow flower lovers, we still need to work harder.