Analysis of black spot (anthrax)

Analysis of black spot (anthrax)

A few days ago, an orchid friend questioned the prevention and control of the black spot disease. Yesterday, the local orchid friend also talked about this matter. I had a headache. I saw that the orchid grass was safe in the lower orchid grass. I asked for discussion. Looking at the orchid grass on the Internet and local orchid friends, black spot disease occurred to varying degrees in September. According to my practice, I should pay attention to the following points:

One: the plant material should be loose and breathable, and the Langen should not reach the basin wall when it is put on the basin.

Second: try not to water and spray chemical fertilizer during the day in the high wet season, watering thoroughly, and the temperature difference between day and night should be improved, preferably no less than 8 degrees Celsius.

Third: foliar fertilizer should not be too thick, such as self-care had better spray less, foliar fertilizer or water should also be sprayed in the evening to meet the physiological needs of orchids.

Four: the seasons change, the climate is hot and cold, especially in September, when there are more muggy weather and cool weather, it is also the time when Lanyou is most likely to neglect, eager to put on fertilizer, pots, and the pot material is too wet. Once the temperature picks up, bluegrass black spots occur in one or two days, the causes are various, the root system is not good, excessive fertilizer spraying, water control time is not noticed, the orchid basin is too wet after the weather picks up, and the night ventilation is not smooth. Spraying medicine at the wrong time and so on.

Five: when the weather suddenly turns cold in September, we should give priority to disease prevention and timely spray fungicides such as topiramate.

Six: the orchid friends raised on the balcony should pay attention to the temperature difference between day and night, increase the use time of the fan in the evening in September, and can also reduce the incidence of the disease.

Seven: for serious disease, it is recommended to turn the basin, wash and cut off the rotten roots, cool and dry, at this time the weather should be cool for about 12 hours, after potting, pour the root water with topzine, and then pour it thoroughly with clean water the next day, which can generally control the disease.

I have mastered the above principles in cultivation, and the probability of this disease is indeed small. As long as I master the physiological characteristics of orchid grass, some diseases can indeed be prevented. I wish orchid friends to have a good mood and succeed. There are a lot of online information about the pathology of this disease. The above is for orchid friends' reference.

Http://www.shorchid.com/lhbbs/dispbbs.asp?boardID=8&ID=620&page=8