Identification and control of orchid anthracnose
First, symptom characteristics. Anthracnose mainly harms the leaves of orchids and sometimes infects stems and fruits. The disease spot on the leaf begins to be round or oval, the center is light brown or grayish white, the edge is dark brown or dark brown, and there is a greenish halo around it; black spots are produced on the disease spot in the later stage, scattered or slightly arranged in a wheel, and orange-yellow sticky matter will appear under wet conditions. With the development of the disease, the disease spot on the leaf can expand into irregular spots up to several centimeters long, or the disease spot can be connected into a piece, and finally cause the leaves to wither and yellow. The size of the disease spot on the leaf is 3-20 mm, which varies greatly. Irregular or striped black-brown spots appeared when the stems and fruits were damaged.
1. Strengthen cultivation management: greenhouse should be ventilated and transparent. In winter and early spring of the following year, special attention should be paid to keeping warm so that it will not suffer frost and frost damage, so as to enhance its ability to resist diseases. After moving outside, it should be placed in the shade shed to prevent the attack of wind and rain, at the same time, there should be enough sunlight in the shed, and it is better to pour it slowly from the edge of the flowerpot or soak in the basin to irrigate, so as to reduce the spread of bacteria with water droplets caused by pouring above. Flowerpots should not be placed too tight. Orchid fertilization should pay attention to science. As we all know, orchids should be ripe rather than grown. Anthrax can easily be induced by the application of raw fertilizer. When potted, new soil should be replaced. 4. Non-pesticide prevention and treatment: (3) pig bitter bile. Anthracnose and soft rot can be controlled by mixing pig bitter bile and clear water at the ratio of 1 to 100, adding a small amount of washing powder and spraying orchid plant.
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Control of common diseases and insect pests of sweet-scented osmanthus
1. Leaf spot disease: it mainly harms the leaves, with brown spots at first, round or irregular spots, gray to grayish white in the center, reddish brown on the edges, and black-gray mildew on the spots. High temperature and humidity are often the inducement of the disease, which is spread by wind and rain and infected, and the condition decreases after October.
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Occurrence and Control of Leaf spot of Carnation (Carnation)
Carnation, also known as carnation and carnation, is easily infected with leaf spot disease, affecting its growth and development and reducing the yield and quality of fresh cut flowers.
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