What medicine does orchid leaf blight use?

Orchid leaf blight is a serious disease that harms orchids. It usually spreads quickly to the branches and leaves of orchids and the incidence rate is very fast. In almost a few days, the whole sick seedling turns yellow and dies. It is a bit similar to soft rot. Only after the death of the diseased plant, there is no peculiar smell, and the soft rot diseased plant smells smelly. Let's take a look at what medicine is used for orchid leaf blight!

Symptoms of orchid leaf blight

Orchid blight begins to yellow on one side of new or old grass (metabolized grass is yellow at most, and the disease is yellow almost at the same time. Metabolic only yellow old grass, leaf blight attack is not divided into old grass and new grass), in a few days the whole sick seedling will turn yellow and die, serious will occur one by one, until the whole pot of orchids die.

Occurrence law of orchid leaf blight

Orchid leaf blight is a disease caused by fungi. The pathogen is cylindroidium phalaenopsis. The pathogen overwinters or oversummers on the diseased leaves. When conditions are suitable, the pathogen spreads by rain and water droplets, mainly invading from wounds or directly invading from the epidermis of young leaves. April to July is the onset period of old leaves, and the peak period is from late May to June. July to November is the period of new leaf disease, and the new leaf is heavier than the old leaf. The disease begins in the middle of December every year in Guangdong area, suffers heavily in March of the next year, and tends to stabilize after May. In the appropriate temperature, relative humidity or leaf wet conditions easy to disease, soil hardening, potted flowers placed too dense, poor ventilation and light transmission disease heavy.

What medicine does orchid leaf dry disease use?

1. Strengthen management: greenhouse should be ventilated and transparent, flowerpot should not be placed too densely, and new soil should be replaced when potted. Remove diseased leaves and their residues in time to eliminate the source of infection and prevent the spread of diseases.

2. Chemical control: 0.5~1% Bordeaux mixture or 65% zebrazine wettable powder 600~800 times can be used before the disease, spraying once every 7~10 days, which has a good protective effect. During the disease period, 50% carbendazim 800 times solution or 75% thiophanate-methyl 1000 times solution can be sprayed to control the spread of disease.