Identification and treatment of common diseases and insect pests in orchids

In the process of planting orchids, we often find that the roots of orchids are tender, thin, or decayed and necrotic, and the leaves have black spots, brown spots, scorched spots, scorched tips, dry leaves lose water, the whole orchid decayed and yellowed, and the new buds grow necrotic or rigid. We should first distinguish what causes the abnormal situation of the orchid plant; environmental factors, nutritional factors, or pest factors. Only by understanding the causes can we treat the disease with scientific means and effectively restore your orchid to health and vitality. If we do not understand the cause and blindly deal with the disease of orchid plant, it will only aggravate the disease step by step or cure the symptoms but not the root cause, and then it will happen again after a period of time, and other diseases will appear again, leaving only regret and regret.

First, the root tips of orchids rot.

1. Orchid root tip contact with stagnant water in orchid plant for a long time, in the case of poor ventilation, it is easy to cause bacteria to multiply rapidly and fester.

two。 When we plant, the orchid plant shakes and the orchid root scrapes the root tip, as well as the root tip injured by oil, smoke and sweat.

Prevention and treatment: in the pot planting, do not touch the root tip, after planting, pay attention to drainage and ventilation can effectively prevent and avoid.

Second, the rotten roots of orchids

1. Touching the root tip of the orchid without healing and watering will cause the rapid propagation of bacteria and lead to the root rot of the orchid, which can be effectively avoided by using granular plant materials to maintain good ventilation.

two。 The roots of orchids are hollow and fleshless, which are eaten by bacteria and insects. Too wet or too dry and black nets can lead to empty roots of orchids. When orchids are planted, they need to be disinfected and sterilized first, and then planted after the wind is half-dry, it can be effectively avoided.

Third, rotten buds of orchids are prone to rust.

1. Rotten buds are usually caused by the rapid propagation of bacteria inside and invading the orchid plant by pouring water into the stagnant water in the center of the leaf when the orchid bud blossoms.

two。 In the period of high temperature, usually in summer, when the orchid plant does not return to normal temperature, the buds are prone to rust, which is very serious. It is recommended to change the watering time to night watering in summer.

Fourth, the leaves of orchid trousers are dry.

1. Orchid trouser leaves dry, generally for the hot weather, poor ventilation, watering trouser leaves caused by muggy.

two。 When the leaves of orchid trousers are black and rotten, the watering frequency is too high, the ventilation of the plant material leads to the plant material being too wet, or the plant material is not changed for a long time, which leads to the decay of the plant material, which leads to the increase of powder and bacterial infection.

3. New buds of orchids have been unearthed, and the plant materials should not keep up. The old grass will provide nutrients for the new buds to grow through returning grass, which is characterized by yellowing and drying up quickly from the trouser leaves outside the old grass.

Fifth, the leaves of orchids turn yellow

1. The old leaves of orchids turn yellow and fall off rapidly, which is a normal aging phenomenon.

two。 The leaves of orchids turn yellow and green, and other parts are normal, usually caused by strong light.

3. The new leaf tip of orchid seems to be scorched, and when it is serious, the base dies, and the root in the basin will die, but it is not infected, which is caused by too much fertilizer or fertilizer too close to the root of orchid.

4. The tender leaves of orchids are hooked at first, and then die inward from leaf tip and leaf edge, which is caused by calcium deficiency of orchid plants.

6. The base of the tender leaves of the orchid is light green, withered from the leaf base, and the leaves are twisted, which is caused by boron deficiency in the orchid plant.

Sixth, the bud of the orchid turns yellow or the mouth of the bract does not expand.

1. The orchid bud turns yellow and then brown, due to the humidity difference is too large, the temperature is too high or frozen in winter.

two。 The bonding of orchid buds is not easy to unfold, and the humidity is too low to dry.

3. The metamorphic bud of orchid is caused by genetic or unknown physiological factors.

Seventh, the bud of orchid does not grow.

1. Orchid buds do not grow, caused by turning pots or other external forces.

two。 The flower buds of orchids do not grow due to genetic factors or high night temperature.

3. Orchid buds do not grow, caused by insufficient vernalization conditions or sudden increase in temperature.

Eighth, orchid flowers wither before maturity

1. The base of the lip of the orchid turns red and is injured by low temperature.

two。 The labellum of the orchid is abnormally red and withered, caused by the loss of pollen tubers or fertilization.

3. The outer edge of orchid lip is discolored and withered, and some flowers are deformed, which is caused by dehydration caused by light exposure for too long.

Ninth, insect, ant-caused orchid disease

1. Diseases caused by insects and ants, as long as the insects and ants can be killed, will be shown as stem rot and soft rot, and will continue to be prevented in the future.

two。 The decay of leaves, buds, growing points, bulbs and roots are all caused by muggy weather, high temperature, careless watering, stagnant water in basin soil and poor ventilation.

Tenth, fat injury, drug injury

1. The fertilizer injury of the orchid is excessive, so that the growth resistance of half of the plant is shaded and withered.

two。 In order to increase the number of buds of orchids, unscrupulous fertilization will result in considerable growth in one or two years, but the leaves of the old plants are withered and yellow, and the roots are rotten.

3. Due to excessive fertilization, the accumulation of too much or fertilizer too close to the root of the orchid, so that the orchid plant can not digest and toxic.

Solution: do not apply fertilizer in summer, apply thin fertilizer frequently, put fertilizer at the edge of the orchid pot away from the root, use less flower fertilizer, use more slow-release fertilizer, and be sure to water again the next morning after the use of organic fertilizer. Author: Mei Fei, I will post orchid knowledge and pictures every day, take you to know more about orchids and teach you to raise orchids easily. If you don't understand orchids, you can always ask me or leave a message below. If you like, you can click on the upper right corner to collect or forward to help others!