In recent years, diseases in kelp farming have caused headaches in some coastal areas. There are two main reasons for this: First, there are blisters that eat algae in certain sea areas. When the kelp seedlings grow to several centimeters long, the pests attach to the seedlings and snap them off. Another is that in the later period of kelp growth, a large area of ​​white rot disease often occurs. There are two kinds of symptoms of white rotting, one is that there are many small white spots on the leaves of kelp, gradually rotten into a small hole, and expand around, until the entire kelp rot. The other is to start with the tip of the kelp and both sides turn white and rotten, and gradually spread inwards. In severe cases, the entire kelp rots only to the size of the rabbit's tail.
The following two simple precautions are recommended:
First, pest control law. Minamata is characterized by strong activity during the day and weak activity at night. In the evening, when the water temperature drops to 8°C, it sneaked into the sea floor and will not pose a threat to kelp. In the daytime when the water temperature rises, the seawater and urea can be added in a ratio of 300:1. The kelp seedlings will be placed in the fertilizer water for a short period of time. The leeches will fall from the seedlings and then the kelp seedlings will be dropped. Put back into the sea. Using this method is simple and efficient, and two people can rake in more than ten “joint seedlings†every hour. Kelp seedlings have to be fattened twice a day; it is advisable to use 4 to 5 o'clock in the morning and 6 to 7 o'clock in the afternoon. And to adhere to fertilizer every day, when the head of the seedlings grow to 66 centimeters or more can be clipped. With a good seedling, the roots of the seedlings are thick and grow fast, and the pests pose no threat to it.
Second, deepen the water layer method. When seaweed grows from mid-March to early April, the transparency of seawater increases dramatically as the weather turns fine. The mid- and late-season seaweed seedlings have a short growing period and weak seedlings and are difficult to adapt to the rapidly changing external environment. During this period of time, farmers need to diligently go out to the sea to observe closely. Once a few kelp seedlings are curled on both sides, it is a precursor to white rot disease. In the meantime, if measures are not taken immediately, there will be a large area of ​​curling in the kelp, which will stop the illness. The water layer in the middle and late seaweeds should be deepened by about 50 to 82 cm (the first stage seedlings can be relatively shallow), usually about 10 days, so that the curled kelp can be straightened and grow well. By mid-April, kelp has entered a period of intense growth, and the demand for light has increased dramatically. At this time, it is necessary to raise the seaweed to about 33 cm from the water surface. This method is particularly effective.
The following two simple precautions are recommended:
First, pest control law. Minamata is characterized by strong activity during the day and weak activity at night. In the evening, when the water temperature drops to 8°C, it sneaked into the sea floor and will not pose a threat to kelp. In the daytime when the water temperature rises, the seawater and urea can be added in a ratio of 300:1. The kelp seedlings will be placed in the fertilizer water for a short period of time. The leeches will fall from the seedlings and then the kelp seedlings will be dropped. Put back into the sea. Using this method is simple and efficient, and two people can rake in more than ten “joint seedlings†every hour. Kelp seedlings have to be fattened twice a day; it is advisable to use 4 to 5 o'clock in the morning and 6 to 7 o'clock in the afternoon. And to adhere to fertilizer every day, when the head of the seedlings grow to 66 centimeters or more can be clipped. With a good seedling, the roots of the seedlings are thick and grow fast, and the pests pose no threat to it.
Second, deepen the water layer method. When seaweed grows from mid-March to early April, the transparency of seawater increases dramatically as the weather turns fine. The mid- and late-season seaweed seedlings have a short growing period and weak seedlings and are difficult to adapt to the rapidly changing external environment. During this period of time, farmers need to diligently go out to the sea to observe closely. Once a few kelp seedlings are curled on both sides, it is a precursor to white rot disease. In the meantime, if measures are not taken immediately, there will be a large area of ​​curling in the kelp, which will stop the illness. The water layer in the middle and late seaweeds should be deepened by about 50 to 82 cm (the first stage seedlings can be relatively shallow), usually about 10 days, so that the curled kelp can be straightened and grow well. By mid-April, kelp has entered a period of intense growth, and the demand for light has increased dramatically. At this time, it is necessary to raise the seaweed to about 33 cm from the water surface. This method is particularly effective.
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