how to treat botrytis blight on roses
In summer, when it rains continuously, flower practitioners are particularly troubled by gray mold, and the problem of infection and rot rises sharply.
No matter the flower base, suppliers, or florists, no one is spared. Botrytis is really hard to prevent.
The scary gray mold
In summer and rainy season, there are many pathogenic spores floating in the air of rose greenhouses. Once they encounter a suitable organism, they can quickly germinate and harm the host. The virus is very lethal and can infect an entire bunch of flowers within a few hours.
Botrytis spores can infect petals, calyces, stems, and leaves. Botrytis spores can even survive in the soil, plants, greenhouse walls, poles, and hanging wires, and are spread to plants through airflow, agricultural operations, etc. , once the conditions are right, it will explode quickly.
The outbreak temperature of gray mold is 18-23℃ and the humidity is above 85%. Therefore, on continuous rainy days, gray mold can easily break out.
Botrytis cinerea infects flowers in the following ways: stems, leaves, flower heads, etc. are invaded; the remaining pathogens that overwinter in the soil invade from the base of the stem; Botrytis cinerea invades from the remaining petals; Botrytis cinerea invades from the stigmas that have not fallen off; Dead petals and leaves stick to other flower stakes, allowing pathogens to invade.
It is often too late to apply pesticides to control gray mold after it occurs. Therefore, the best way to deal with severe gray mold is prevention!
How can bases and flower shops prevent gray mold?
According to the growth needs of flowers for temperature and humidity, the temperature and humidity conditions in the greenhouse should be controlled as much as possible. The maximum temperature during the day should be controlled at 25-30°C, and the relative humidity should be controlled below 85%. Pay attention to ventilation and lighting.
Timely spray pesticides for prevention and control. When the weather is humid, it is not advisable to water and spray flowers. In low-temperature weather, try to spray pesticides in the morning.
If the ventilation inside the flower shop is poor, the humidity is high, and the environment is not cleaned in time, a large number of germs will breed, causing a large-scale outbreak of gray mold. The correct approach is to store flowers in a clean, low-humidity area and maintain good ventilation.
When the flowers arrive, unpack them as soon as possible, remove the outer packaging, and spread them out to dissipate heat. Cut off about 3 to 4 centimeters from the rhizome and put it in water containing preservatives. Throw away rotten flowers and leaves infected with gray mold in time to avoid infection.
In cold and humid weather, do not spray water on the flower heads, as this may cause rot and mold and shorten the vase period of the flowers.
Flower shops must be disinfected regularly. Refrigerators, cold storages, flower vessels, flower buckets, operating areas, tools, etc. must be disinfected once every three days during special seasons. If spray disinfection is not convenient, ultraviolet light can be used for irradiation disinfection.
You can use gray mold water to soak flowers, which can better inhibit the generation and spread of germs.
Original article author：Fragrant Road Full，If reprinted, please indicate the source.：https://www.theroadfull.com/article/2547.html
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