Carnation disease prevention and control methods

Carnation leaf spot

disease

Carnations are easily infected with leaf spot disease, which affects their growth. When the disease occurs, long strips of spots will appear on the stems and leaves. In severe cases, the spots will ring-cut the stems, causing the upper branches and leaves to die. If infected with the disease during the flowering period, the flowers will not open or will appear deformed.

Prevention and control measures

Carry out disinfection during planting and remove diseased plants in time if found. Strengthen management, keep the plant surface dry as much as possible, and plant it in a well-ventilated, light-permeable and well-drained place. Keep the greenhouse well ventilated and ventilate before dusk.

Leaf spot disease can occur year after year, so preventive fungicides must be sprayed once a week, such as maneb, mancozeb, cypermethrin, and thiophanate-methyl, especially during the peak flowering period, when spraying is needed in time. 75% thiophanate-methyl, 500 times diluted 50% captan or 1% Bordeaux mixture can be used.

Carnation gray mold

disease

Carnations are affected by gray mold. After the buds, petals, stems and leaves are covered with gray mold-like substances, brown water-soaked spots appear, causing the petals to rot, the buds to fall off, the stems and leaves to die, the diseased buds to fail to bloom, and the infected flowers to lose their color. The disease is serious when the temperature is high and the humidity is high, and it spreads rapidly and is rampant. Prevention and control are necessary to protect the stems, leaves, buds and petals in order to promote flowering, prolong the flowering period and improve the ornamental value.

Prevention and treatment methods

For timely prevention, spray the leaves with 1000 times potassium permanganate aqueous solution once a month, evenly wet all the leaves, buds and petals until water droplets start to drip down. If there is a lot of rain, high temperature and high humidity, many gray mold-like substances will appear on the stems, leaves and flower buds. Spray the leaves with 1000 times of Sukerling 2 to 3 times continuously, once every 7 to 10 days, to kill the bacteria and allow the diseased parts to quickly resume normal growth, strengthen the stems, leaves, flower buds and petals, and promote flowering.