Diseases and their control of Strelitzia reginae

Strelitzia reginae brown spot

Symptoms

Brown spot disease mainly harms leaves, infecting weaker and wounded leaves. At first, the spots are brown with yellow halos around them. Then they slowly expand, becoming irregular in shape, with the edges turning reddish brown. Later on, they turn into dark brown spots with black granules appearing.

Prevention

Provide Strelitzia with the nutrients it needs to grow, add phosphorus fertilizer or potassium fertilizer to promote the growth of the plant. In addition, the substrate needs to be strictly sterilized before use. In the early stage of the disease, you can spray a mixture of pentachloronitrobenzene fungicide and liquid nicotine insecticide for prevention and control.

Strelitzia anthracnose

Symptoms

Anthracnose also harms leaves. The lesions are circular or nearly circular, with reddish-brown lines on the edges and gray-brown in the center. When the conidia mature, small black dots will appear. Old leaves usually become sick in early April in the first half of the year, and new leaves become sick in August in the second half of the year.

Prevention

Pay more attention to reducing wounds, water and fertilize in time, and cut off diseased leaves in time when they are found. You can also remove them and burn or bury them deeply.

Strelitzia reginae leaf spot

Symptoms

The disease harms the leaves, and at first there will be grayish-white spots with brown-purple coils on the edges and many small black dots on them.

Prevention

Cut off the diseased leaves and then apply 30% basic copper sulfate suspension on the wound. In the early stage of the disease, you can spray 800 times diluted Carranon wettable powder or 500 times diluted Mancozeb wettable powder every 10 days for 2 to 3 times.

Strelitzia root rot

Symptoms

The pathogen mainly invades through root wounds, produces conidia in the diseased part, and spreads and infects with the help of rainwater or irrigation water. In the early stage of the disease, the root and stem tillers turn brown and black and rot, and the growth of the above-ground part of the plant slows down. After a period of time, the plant will wither and the leaves will turn straw color.

Prevention

Raise the ground temperature, which should not be lower than 5℃ in winter, and increase the permeability of the soil. At the early stage of the disease, spray 800 times diluted 50% toluidine wettable powder or 1000 times diluted 50% benomyl wettable powder.

The health of Strelitzia reginae is very important. I hope everyone can cultivate a disease-free and harmless Strelitzia reginae.