Why do the leaves of the umbrella produce oil, and why do the leaves of the umbrella produce oil?

In 1963, the Briton P. F. Verling first isolated a compound that can induce bud dormancy from Acer eurasia, called hypnocin, and later proved that it is the same compound as abscisin that promotes the shedding of plant organs isolated by the American F. T. Adicott in 1963, and is named abscisicacid (ABA for short). Abscisic acid is present in dormant or near-dormant organs, and its concentration decreases as dormancy is lifted. Abscisic acid's effect in maintaining bud dormancy can be counteracted by gibberellin (GA for short).

Insect infestation is caused by the excretion of scale insects.

This insect reproduces very quickly, and the number of reproductions at one time is also very large. This is not difficult to understand, if there are only a few, it is impossible to cause any serious situation. This pest can occur 3 to 5 times a year, and they can also overwinter, and in March of the following year they become active and begin to damage plants; Most of them gather on the leaves of plants, and they pick new young leaves to suck the sap of the plant to survive, and the color of the leaves will change from the original tender green or dark green to gray-green, and finally the sap is sucked dry, and the whole leaf will turn yellow.

In addition to making the leaves very oily, their secretions can also cause other plant diseases, such as bituminous coal disease. Such as a sedan car.

If you find it, you can spray it with a special agent, and then wipe the leaves with a clean cotton cloth and laundry detergent. The action must be gentle, but you can wipe it a few times, and finally wipe it with water to avoid the residual laundry detergent water from hurting the leaves. If it is serious, you can cut off the branches and leaves and burn them.

In winter, prune the plants and remove all the branches in the diseased area.

The main reason. To be precise, pests are caused by the excrement of scale insects.

Features. This insect reproduces very quickly and the number of reproductions at one time is very large. It's not hard to see why.

If there are only a few, it is unlikely to cause any serious situation. This pest can occur 3 to 5 times a year, and they survive the winter. In March of the following year, they become active and begin to be resistant to the plant.

They mostly gather on the leaves of plants, selecting new and young leaves to absorb the sap of the plant to survive. The color of the leaves will change from light green or dark green to gray-green, and finally the juice will be sucked dry, and the whole leaf will turn yellow. Their secretions not only make the leaves very greasy, but also cause other plant diseases, such as bituminous coal disease.

Solution. If found, it can be killed by spraying with special chemicals, and then wiping the leaves with a clean cotton cloth and sticky spring laundry detergent water. The action must be light, but it can be rubbed a few times.

Finally, wipe it again with clean water to avoid the residual laundry detergent water from harming the leaves. If it is serious, you can cut down the branches and leaves and burn them. In winter, we should prune the plants and prune all the branches in the diseased area.

1. Pests and diseases Greenhouse potted plants or large-leaved umbrellas are planted with high indoor humidity, high temperature, relatively closed and impermeable and other conditions will cause pests and diseases to the plants. If you notice white spots on the surface of the leaves or if the leaves are curled up and falling off, look closely for the presence of some kind of bug. If the leaves of the cultivated large-leaved umbrella first turn black and then rot, it may be caused by bacteria, and it is recommended that you spray some drugs such as "carbendazim" on the foliage; If you find that there are obvious small insects on the leaves of the large-leaved umbrella, then you can choose to spray the "black whirlwind", and the pest will get better after a period of time.

2. The temperature of the growing environment is too low Because the origin of the large-leaved umbrella is in the tropics, planting this plant in winter should ensure that other growth conditions are suitable while keeping the surrounding temperature below 15 degrees.

3. Improper watering and fertilization If the large-leaf umbrella is not properly fertilized, there will be a phenomenon of "burning leaves", which is also the main reason for the large-leaf umbrella to fall off leaves. If you apply a small amount of fertilizer at a time, it is possible that the fertilizer is too close to the roots of the umbrella during the fertilization process. In winter, the amount of water and fertilizer should be strictly controlled, and the frequency can be watered every four days or so.

In addition, in order to avoid too much dryness in winter, you can drench a very small amount of water on the surface of the leaves of the large-leaved umbrella.

1. Appropriate amount of watering and fertilization. Reduce the frequency of watering and fertilizing as appropriate during the winter and in a suitable growing environment.

2. The minimum safe temperature for planting large-leaf umbrellas in winter is 8 degrees Celsius, so be sure to do a good job of cold protection. In summer, avoid direct sunlight and shade the sun at noon.

Planting management.

Umbrella tree potted plants can be used as a substrate with a mixture of garden soil and humus soil. 3 October is its vigorous growth period, the growth is larger, generally once a month to fertilize, while keeping the soil moist, to ensure sufficient moisture, and frequent foliar spray, so as not to dry the air, the leaves fade green and yellow. In summer, avoid direct sunlight, pay attention to proper shading, generally 30 40%, so as not to expose the leaves to the scorching sun and lose their luster or burns, withered yellow.

Indoor furnishings should be placed in a place with a certain amount of diffused light, and attention should be paid to ventilation. In late autumn and winter, the amount of watering should be reduced and the amount of fertilizer should be controlled; Foliar fertilization can be carried out by spraying phosphorus and potassium fertilizers such as potassium dihydrogen phosphate in late autumn to promote the aging of branches and leaves and improve cold resistance in winter. Anthracnose or scale insects and red spiders will occur in greenhouses and indoor conditions of high temperature, humidity and poor ventilation, and should be observed and prevented in time.

1: Overwatering 2: Insufficient nutrients.

Cause analysis.

1.The temperature is too low. The winter maintenance temperature of the large-leaf umbrella should not be lower than 5 and should be kept above 15. In winter, you should put the large-leaf umbrella in a sunny place as much as possible, and do not put the large-leaf umbrella near these equipment when there is a heating device or air conditioning.

2.Watering too often. In winter, reduce the amount of watering and control the amount of fertilizer.

Generally, it is better to water once every three or four days, and because of the dry winter, you can spray a little water on the foliage every day. Foliar fertilization can be carried out with phosphorus and potassium fertilizers such as potassium dihydrogen phosphate sprayed in late autumn to promote the aging of branches and leaves and improve cold resistance in winter.

3.Pest. Greenhouse and indoor conditions such as high temperature, humidity, and poor ventilation may cause anthrax or pests and diseases such as scale insects and red spiders. In particular, when the leaves are curled and falling, and there are white spots on the leaf surface, it should be carefully inspected.

The stems of the large-leaved umbrella are erect, sparsely branched, and the shoots are green, brown later, and smooth. Green. Glossy, pale green on the back of the leaves.

The petiole is reddish-brown and 5 10 cm long. The cultivation method of large-leaved umbrella is very simple. Large-leaved umbrellas can be propagated by sowing seeds and cuttings.

When sowing, it is best to sow the seeds immediately after harvesting, so that the germination rate is high. Spring, summer and autumn can be cuttings, generally cuttings and shaping combined; Cut off the branches of the irregular plant 10-15 cm from the surface of the potting soil, and let the mother branch germinate several branches to cultivate a good tree shape. Cut the semi-lignified shoots and cuttings in river sand or perlite cultures, maintain a certain substrate humidity and air humidity, and pay attention to shading.

Umbrella tree potted plants can be used as a substrate with a mixture of garden soil and humus soil. In summer, avoid direct sunlight and pay attention to proper shading, so as not to lose luster or burn and yellowing the leaves due to scorching sun exposure. Indoor furnishings should be placed in a place with a certain amount of diffused light, and attention should be paid to ventilation.

In late autumn and winter, the amount of watering should be reduced and the amount of fertilizer should be controlled; Anthracnose or scale insects and red spiders will occur in greenhouses and indoor conditions of high temperature, humidity and poor ventilation, and should be observed and prevented in time.

There is only one and only one kind of pest that can make the leaves of plants come out of oil, it can cause a layer of oily covering on the leaves of plants, it is a scale insect, go to the flower shop to buy wild scale killing according to the instructions for use or the boss teaches you how to use the method of spraying leaves to kill insects, medicine to the disease, the effect is very good. Before spraying, cut off the leaves and vegetables with more insects, cut the denser branches and leaves, clean the pot surface, remove a layer of topsoil, and then spray the leaves and branches and pot topsoil in an all-round way, so as to achieve a better insecticidal effect.