If you plant any flowers, what flowers die? It's not that you don't love flowers enough, it's that you need to understand the needs of flowers. Flowers, like people, have what she wants. If people want to eat, flowers need to drink water; if people want to exercise, flowers need to bask in the sun; therefore, to raise flowers, we must understand the spleen of flowers. Now let's get rid of the flowers!
Plant diseases are generally divided into physiological diseases and biological infection (pathological) diseases.
Common physiological diseases include:
Burn caused by strong light in summer
Frostbite caused by low temperature in winter
Rotten roots caused by excessive moisture
Leaf scorching or wilting occurs due to water shortage
The soil lacks some nutrients,
A large number of yellow leaves caused by nitrogen deficiency
In the case of phosphorus deficiency, the leaves do not bloom at maturity,
In case of potassium deficiency, a large number of leaves will fall and the whole plant will wither
Excessive fertilization or application of unripe organic fertilizer results in tender tip and scorch
Alkalinity of soil and water causes the leaves of acidophilic plants to turn yellow and fall off
Weak leaves and scorch of alkali loving plants caused by acid in soil and water
Physiological diseases are not infectious. As long as the cultivation environment is improved in time and appropriate measures are taken to meet the requirements of plant growth and development, it is possible to improve.
Common biological infection diseases are mainly caused by fungi, bacteria, viruses, nematodes and bacteroids.
The common diseases of family flower cultivation are as follows:
leaf spot
It is a common leaf disease of Begonia plants with bulbous roots. It also damages many kinds of flowers and trees, such as brandy, fishtail, Canna, crape myrtle, pedunculate Begonia, Japanese Begonia, osmanthus, azalea, Impatiens, geranium, cockscomb, etc. The disease is characterized by necrosis of local cells on the leaves, which shows different spot symptoms. The common spots are angular spot, strip spot and round spot, which are gray, black and brown. When it is serious, the leaves turn yellow, scorch and fall off.
powdery mildew
Most of them damage the shoots, buds, leaves and buds of flowers and trees. It mainly damages rose, rose, rose, plum and other plants. At the early stage of the disease, the affected parts appear chlorotic spots, and then gradually become white spots, like a layer of white powder; at the later stage, the disease spots become gray. The affected plants are becoming smaller and smaller, the young shoots are curved, the leaves are uneven, and the flowers are small or unable to bloom or distorted. In severe cases, the leaves shrink and wither, and even the whole plant withers. The application of P and K fertilizer should be increased appropriately, and the spraying of water on the leaves should be stopped.
It mainly damages leaves, stems, young shoots, flower buds, fruits and other parts, mostly orchids, Junzi orchids, pansy, cyclamen, goldfish grass, brandy, Magnolia, Hydrangea and other plants. After most of the plants were injured, the disease began from the tip and the edge of the leaves. There were nearly round spots on the surface of the leaves. The edge of the spots was mostly purple brown or dark brown, and the center was light brown or gray white. In the later stage, there were black spots on the spots, which were often arranged in the shape of whorls. When the disease was serious, the leaves died. Ventilation and light transmission shall be strengthened, and spraying of water on the blade surface shall be stopped.
Grey mould
It is mainly harmful to leaves, stems, flowers and fruits, and more harmful to peony, cyclamen, Primula, chamomile, camellia and other plants. At the beginning of the disease, water spots appeared, and then gradually expanded into brown or purple brown spots. When the weather is wet, gray hairs grow on the spots, and the whole plant died when the disease is serious.
Bacterial soft rot
Bacteria infect rhizome, corm, bulb, tuber and other vegetative organs, and most of them damage flowers such as calla, lily, gladiolus, iris, cyclamen, hyacinth, Clivia and Dahlia. Generally, the damaged parts are water stained at first, then brown, then sticky, slippery, soft and rotten, and become a package of rotten soup when the humidity is high, and become powdery and shriveled things when the humidity is high.