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Water grass leaves yellow: insufficient light leaves yellow

Aquatic plants are beautiful in shape, colorful and graceful. They are planted in aquarium, and then decorated with river sand and sunk wood. They look beautiful and generous. They are one of the best ornaments and appreciation items in aquarium. In our own breeding, there will always be yellow leaves, rotten roots and other situations, so how do we deal with these problems? Please take a look at some of the experience Xiao Bian has summed up.

The reason analysis and treatment methods: 1. Physiological dehydration leads to the yellow leaves (dry yellow): when the symptoms are mild, the leaves will become small and dark green, especially the young leaves can not be expanded and curly; In severe cases, it began to rot from the tip and edge of young leaves, gradually spread to the old leaves, and finally the whole plant withered and died. The main reason for physiological dehydration of aquatic plants is that the concentration of total ions in water is too high due to excessive fertilization.

Solution: therefore, regular water change and monthly fertilizer application control are necessary steps to avoid physiological dehydration of aquatic plants.

2. Exposure to the sun causes the leaves of aquatic plants to turn yellow: beyond the temperature limit, many species of aquatic plants will grow poorly or wither and die.

Solution: can not be placed in direct sunlight, should use a cover for its shade.

3. Lack of sunlight leads to the yellow leaves of water plants (lack of light yellow): lack of sunlight, can not carry out photosynthesis, leaves will be yellow, wilt.

Solution: it's better to be able to bask in the sun. If you have that kind of lamp, you can shine more in the daytime.

4. Too high temperature leads to yellow leaves of water plants: gas accumulation in the diffusion bucket will reduce the dissolution efficiency, and the leaves of water plants are easy to be burned by strong light due to insufficient carbon dioxide. It's easy to turn yellow after burning, and water plants turn yellow when the temperature is too high. The change of growth morphology was manifested as shrinkage and distortion of stem or leaf, abnormal elevation of water plants and so on. The stems and leaves dissolved and rotted.

Solution: you can use a fan to cool down.

5. Low temperature leads to yellow leaves of aquatic plants: the metabolic function is reduced, resulting in growth stagnation or atrophy. The physiological changes of the tissues were abnormal, and the tissues of the leaf receptacle disintegrated and formed dead leaves or fallen leaves. Local or total necrosis of water grass tissue, leading to root, stem or leaf rot symptoms.

Solution: generally, the water temperature is 20 ~ 24 ℃. For tropical water plants, the water temperature should not be lower than 15 ℃ in winter. Therefore, there should be a heating rod or thermostat to keep the water temperature in the aquarium in the northern winter. However, the heat preservation device should not be too close to the water plants, so as to avoid the death of water plants caused by too high water temperature. If possible, the water lifter can be used to make the water in the aquarium circulate. In order to facilitate heat distribution, it is also good for the growth of aquatic plants.

6. The long-term lack of fertilizer of aquatic plants leads to the yellowing of leaves (lack of fertilizer yellow): generally, aquatic plants do not have too much nutritional problems, and they will absorb nutrients from the water. However, if you have too much water in a small tank, the nutrition will not be enough.

Solution: if you don't raise fish, you can spread some base fertilizer, but always open the filter, otherwise it will affect the water quality; You can also buy some water, grass and liquid fertilizer to add at a fixed time.

7. Rotten roots lead to yellow leaves of aquatic plants: when aquatic plants are bought back, their roots or petioles are damaged. In this way, nutrients will not reach the leaves, it will be yellow. If the petiole is damaged, the leaf will not be saved.

Solution: it is suggested to discount it directly; Root damage will improve when the root grows out. It is suggested to use ceramsite and water grass sand or river sand as bottom sand to fix water grass, so that the root will not be crushed and the root can be extended smoothly.

8. Diseases and insect pests lead to the yellowing of water grass leaves: when the pathogen infects the water grass, the water stain like brown spots appear on the leaves at first, and then gradually turn yellow, and even the whole leaves are fibrous and soluble in water. If they contact with healthy leaves, they will soon be infected. The main cause of this disease is that the temperature of aquatic plants is too high during transportation, which makes bacteria grow and infect. Then, when the buyer bought back the water grass, the infected plants were mixed with the healthy plants.

Solution: if it is not removed in time, it will be planted in the water tank, and the bacteria will soon spread. One of the ways to control the disease is to cut off the leaves or stems in time. If it is a tufted weed, remove the diseased leaves and open them in another container to observe the progress of the disease. Once new symptoms are found, soak them with 0.2-0.5 mg / g copper sulfate immediately to kill the pathogenic bacteria; The second is to reduce the water temperature of the water tank to below 20 ℃ to control the propagation of pathogenic bacteria.

Experience of Saxifraga maintenance: biological diseases of Saxifraga

1. Being eaten by fish in the water: some fish live on aquatic plants in their original place of origin, so they will be happy with the aquatic plants in the aquarium. Such as: large pencil fish, silver plate, eight character doll, Thai crucian carp, crown world and so on, should avoid raising in the water tank.

2. Digging by fish in the water: some fish, such as most of the African snapper, crown loach, etc., although they can't eat aquatic plants, they have the habit of digging caves, the purpose of which is nothing more than foraging, establishing sites and breeding. Under these conditions, the roots of aquatic plants often suffer the most; The slight possibility is just the whole plant floating; In serious cases, the root may be bitten off, or even the whole plant may be uprooted, which should be avoided.

3. Feeding by snails in water: snails are one of the important helpers of algae removal in aquatic plants aquarium, but in some cases they will eat aquatic plants, causing damage to the leaves and causing secondary infection. Therefore, when there is such a crisis in the aquarium, it is best to remove the snails as soon as possible. Try not to use drugs to kill, so as not to hurt the innocent.

4. Water goat tooth disease: the bacteria causing water goat tooth disease seem to be specific. Except for the teeth of water hyacinth, other water plants will not be infected by this kind of bacteria. The disease usually lasts for 30 days ° It occurs in the environment of high temperature or high pH value, which is not suitable for the growth of aquatic plants. At the beginning, the leaves of the teeth gradually turned brown and translucent, and finally withered. In addition to cutting the infected leaves and lowering the water temperature to prevent the spread, there is no other effective treatment. The disease mainly occurs on the leaves of aquatic ferns, such as tiehuangguan and Blackwood fern. The pathogen is also a kind of infectious bacteria. The infected leaf tip or edge showed translucent light brown plaque, which was easy to be infected after contacting with healthy plants.

The cause of the disease is related to the high water temperature. Therefore, to control the disease, the diseased leaves should be cut off in time, and then the water temperature should be reduced to below 20 ℃; And careful maintenance, in order to enhance the disease resistance of the plant itself.

5. Mechanical injury: mechanical injury refers to the wound on the surface of aquatic plants in the process of transporting, planting and pruning aquatic plants. If the wound is not treated, it is easy for aquatic plants to be infected with bacteria. Therefore, when planting aquatic plants, be careful not to hurt them. If it is necessary to cut branches and leaves, disinfect them.

6. The root system is not well developed. Because the epidermis cells of all parts of water plants can directly absorb water and nutrient elements from water, the absorption function of root is also reduced. In the morphological structure, the root system is underdeveloped and often lacks root hair. They can only play the role of fixing the whole plant.

7. Pollen variation. Because of the particularity of the water environment, some aquatic plants have a unique adaptive variation in order to meet the needs of pollen transmission. Most aquatic plants such as Vallisneria, haematophyta, Ceratophyllum and cartilaginous grass have special sexual reproductive organs, which can adapt to water as the pollination medium.