Brown spot disease is mainly harmful to leaves. It is disseminated from leaves with weak growth and wound. At first, the lesion is brown, and there will be yellow halos around it, and then it will slowly expand. The lesion will become irregular, the edge will become reddish brown, and later it will become dark brown, and at the same time, there will be black granular matter.
Provide the nutrients needed for the growth of Strelitzia regia, increase the application of phosphorus or potassium fertilizer, and promote the growth of plants. In addition, the matrix needs to be strictly disinfected before use. In the early stage of the disease can be sprayed with a mixture of pentachloronitrobenzene fungicide and liquid nicotinic alkali insecticide for control.
Anthrax also damages leaves. The lesions are round or nearly round, with reddish brown fine lines on the edge and grayish brown in the center. When the conidia disc is mature, black small dots will appear. In the first half of the year, the old leaves usually come on at the beginning of April, and in the second half of the year, the new leaves come on in August.
Usually pay more attention to reduce the wound, water and fertilize timely, cut off the diseased leaves in time when they are found, or burn or bury them after they are removed.
The disease damage leaves, the beginning will appear gray and white dry spots, the edge is brown purple coil, there are many small black dots.
Cut off the diseased leaves, and then apply 30% basic copper sulfate suspension to the wound. At the beginning of the disease, we can spray 800 times of rinon WP and 500 times of mancozeb WP every 10 days for 2 to 3 times.
The pathogen mainly invades from the root wound, produces conidia in the diseased part, and spreads and infects with rainwater or irrigation water. At the beginning of the disease, the tiller buds of roots and stems turn brown and black, rotting, and the plants on the ground grow slowly. After a period of time, the plants will wither, and the leaves will turn straw color.
Increase the ground temperature, not less than 5 ℃ in winter, and increase the permeability of soil. Spray 800 times of 50% likujing wettable powder and 1000 times of 50% Benazolin wettable powder at the beginning of the disease.
It's very important for the health of Strelitzia. I hope everyone can cultivate a disease-free and harmless Strelitzia
