Hawaiian bamboo leaves turn yellow

1. Fertilizer discomfort

When cultivating it, we all choose some rotten leaf soil, river sandy soil and so on, and then mix them with a small amount of organic fertilizer to form a culture medium. This way it will be easier to survive in the early stages. Then wait until March to October every year, apply liquid fertilizer to it every two weeks, so that the leaf color can be thicker green, if the above is not done, then its nutrition will not be supplied, and it is inevitable that the leaves will turn yellow. Therefore, fertilization should also be appropriate.

two。 Humidity discomfort

In its growing period, we must always keep the soil moist, do not let the air too dry, otherwise the humidity will decrease, so that the leaves will become dull, or even yellow. When the air is dry, we can often spray water on its leaves to improve the humidity of the air, so that the color of its leaves can be dark green. Thus it can be seen that humidity is also a reason that affects the color of leaves.

3. Light discomfort

It is very afraid of strong light. If it is accidentally exposed to strong light, it will make the leaves yellow. It generally likes the semi-overcast environment, and endure the shade for a long time, even if you stay in a dark place for 1 to 2 months. So when taking care of it at ordinary times, if you really give it too much sun, you can only accept some bright scattered light.

4. Watering is uncomfortable

Although it is moist, it can not make the water too sufficient, otherwise it will make the basin soil too wet, cause the roots to fester, nourish the nutrient transfer of the plant, and then make the leaves yellow. Therefore, watering must be appropriate in order to keep the leaf color thick green.

5. Disease caused

When the temperature and humidity are extremely high, it is prone to some diseases, which will directly affect its plants, making it impossible for them to grow normally, and thus lead to lack of nutrients, resulting in yellowing of leaves. Then we need timely detection and prevention to prevent damage to leaves.

The difference between Hawaiian bamboo and Phoenix tail bamboo is from the difference of appearance.

Hawaiian bamboo

It belongs to Palmaceae, with a height of 1 to 3 meters. The stem nodes are hollow, slender and well segmented. New buds come out of the stem without branching.

Its leaves grow in the upper part of the rhizome, which is relatively sparse, and there are no leaves in the lower part of the rhizome. The leaves are relatively slender, dark green and feathery. There are relatively few leaves and large leaf spacing on a single branch. Flowers are fleshy inflorescences, usually pink, growing on the upper part of the stem.

Phyllostachys pubescens

It belongs to the Arbor family, with a height of 3 to 6 meters. Stem nodes are hollow, long and thin, with many branches.

Its leaves grow in the upper part of the rhizome, which is relatively dense, and there are few leaves in the lower part of the rhizome. The leaves are long and narrow, linear, some even needle-shaped, and the leaf color is green. There are more leaves on a single branch and the leaf spacing is smaller. Flowers are fleshy inflorescences, usually bright yellow.

(Hawaiian bamboo)

From the difference of growth habits

Hawaiian bamboo

Like the high temperature and humidity of the growth environment, with a strong negative resistance, fear of direct sunlight.

It is suitable to survive at the temperature of 20 ℃ ~ 30 ℃. It has strong cold resistance and can survive the winter at a temperature above 2 ℃.

It has a great demand for water, in addition to normal watering, it also needs to sprinkle water around the plant to ensure a moist environment.

It has high adaptability to soil and can adapt to different soils.

Phyllostachys pubescens

Like light, slightly shady, can not accept the light for a long time, but can not accept the sun exposure.

It is suitable to survive at a temperature of more than 10 ℃, has poor cold resistance and can not be frozen.

It likes to be wet but afraid of stagnant water, which can cause rotten roots for a long time.

It likes acidic and slightly acidic environment, and it is not easy to grow in alkaline soil.

(Hawaiian bamboo)

Distinguish from the range of distribution

Hawaiian bamboo

Native to Mexico and growing mainly in the tropics of South America. Now Taiwan Province of China is also growing in bulk, becoming one of its main producing areas.

Phyllostachys pubescens

It originated in China and is now grown in bulk in the warmer areas of southern China.

(Phyllostachys pubescens)

Common disease of Hawaiian bamboo brown spot

This disease harms the leaves of plants and has a lot to do with watering. The specific prevention and control method is: it needs proper watering during its growth, and it is better to let the flower soil dry rather than make it too wet. If you water too much, it will cause the leaves to rot or turn yellow, affecting the beauty. In addition, when the summer air is relatively dry, water can be watered two or three times a day to ensure the exuberant growth of branches and leaves.

Downy mildew

To deal with this disease, first remove the diseased leaves, and then you can spray some disinfection drugs.

In addition, proper light is needed to increase the disease resistance of the plant. It is a green plant and needs to be protected by the sun, but direct light should be avoided. If the leaves are exposed to the sun, the leaves will turn yellowish or wither directly, which will make the plant suffer more. At the same time, it is also very shady, so when the plant has just entered the growth stage, it is best to carry out some shade protection, do not let the plant be directly exposed to sunlight.

The main harm to Hawaiian bamboo is anthrax. The following is a detailed introduction to the symptoms and prevention methods of anthrax.

Anthrax

Symptom

There are round small brown spots on the surface of Hawaiian bamboo leaves, and then gradually expand into oval, spindle-shaped spots, and semi-spindle-shaped spots on the leaf edge. The disease spots have dark brown wide edges, gray-white center, and small black spots scattered on the disease spots in the later stage.

Morbidity regularity

The pathogens are fungi, Alternaria. The pathogen overwintered in diseased leaves and ground disease residues on the plant and produced conidia in the next spring when the temperature and humidity were suitable. In the growing season, the pathogen was re-infected by wind and rain for many times. The disease can occur annually in the greenhouse. Warm and humid, dew lasting for a long time, cloudy and rainy days, the disease is easy to epidemic. The environmental conditions are not suitable for plant growth, the soil fertility is poor, and the disease is often serious when the growth is weak.

Prevention and cure method

(1) strengthen cultivation management. Remove the diseased leaves and old leaves of Hawaiian bamboo in time and bury them deeply. Pay attention to the application of phosphorus and potassium fertilizer and organic fertilizer to enhance the disease resistance of the plant.

(2) at the initial stage of the disease, spray 1-2-2-200 Bordeaux solution, once every 15 days, for a total of 2 times. It can also be sprayed with 75% chlorothalonil wettable powder, 36% thiophanate suspension, 50% thiophanate suspension, 50% propofol wettable powder 1500 times, 40% carbendazim wettable powder 1500 times, etc., once every 15 days for a total of 2 times.