Causes and control methods of orchid scorched tip

The focal tip of orchids not only affects the ornamental, but also affects the healthy growth of orchids, and even endangers the life of orchids, which is a thorny problem often encountered by orchids.

If the leaf tip of the orchid plant is withered and scorched, there will be different degrees of root rot, and there are many reasons for poor root growth. First, water stains, such as orchid basin texture is fine, water volatilization is slow; culture substrate is not rough enough, low drainage performance; too much watering. Second, freezing damage, orchids can not tolerate low temperature frost, root tips lose the ability to absorb water and nutrients after frostbite, the temperature rises in the next spring, the light is enhanced, the leaf tips will be scorched if they are not fed. Third, fertilizer damage, the cultivation of orchids generally do not need to apply base fertilizer, if the application of organic fertilizer which is not fully ripened and disinfected, it will ferment and hurt the roots in the basin, especially too close fertilization will hurt the orchid root and lead to coke tip. Fourth, high temperature damage, in the greenhouse or greenhouse, too high temperature will lead to leaf tip, leaf edge and leaf tip scorch; thin tube pot planting of the orchid plant, its root tip close to the basin wall, when the temperature is high, the basin wall will also burn the root tip and cause the leaf tip scorch. Fifth, acid damage, more than two years did not change the basin of the substrate, due to the frequent application of acidic chemical fertilizer, so that the matrix partial acid will also cause rotten roots. Sixth, hormone damage, some growers in order to dwarf the orchid plant, the application of growth inhibitors, the residual period of the drug is long, will make the root black and lose function, the leaf can not get nutrient supply, resulting in coke tip, until the whole plant dies. The seventh is element deficiency, some orchid farmers increase the amount of nitrogen fertilizer in order to make the leaves green and sprout, which makes the three elements of fertilizer out of balance, the most common is the relative lack of potassium, the scorch of leaf edge and leaf tip. Eighth, diseases are common root diseases, such as root rot, black rot, bacterial wilt and soft rot. When the plant is susceptible to the disease, it will make the root lose its function and cause the leaf tip to become scorched successively.

And then the whole plant died.

The prevention and control methods of orchid coke tip mainly have the following three points. First, to raise the roots of orchids first, we should choose basin vessels with rough texture, use special utensils with feet and porous basin walls as far as possible; the matrix should be rough, and the mud made locally should be mixed with broken bricks, burning soil or sterilized Chinese fir shavings, in order to enhance water permeability; watering should be carried out two or three days after basin soil drying, fertilization concentration should be low, not high, interval time should be long, avoid partial application of nitrogen fertilizer, so that nitrogen, phosphorus and potassium fertilizer should be used together. If the two-year-old changes the basin, the seedlings can be replaced by pouring 3 times of white alkali water once to neutralize the acid. Second, pay attention to the surrounding environment of Yanglan, poor ventilation or muggy steaming, too low or too high air relative humidity, too strong direct sunlight, etc., are not conducive to its growth. In a simple greenhouse, the film is covered with a film to prevent freezing, because it is unable to drain moisture and absorb moisture. Water drops in the film freeze on the orchid leaves as if they have been scalded by boiling water. Although the light ones can be recovered, a large area scorch will gradually appear in late spring and early summer, so in this environment Moisture absorbent materials such as moisture-absorbing cloth, blankets, gunny bags or straw curtains should be hung in the shed. The third is to prevent and cure diseases. Infectious diseases mainly include scorched tail disease, iron rust disease, iron cannon disease, and so on, while the biggest headache for orchid farmers is the bacterial focal point shrinking head, in fact, the focal tip shrinking head is only the appearance, and its source of disease is deep in the root. Cutting off the focal tip can not fundamentally solve the problem, it is necessary to thoroughly turn the basin, disinfect the root, and remove the source of the disease.