There are white eggs on the leaves of mung beans, which should be moth eggs ... spray some pesticides and sow them when they are finished.
Pepper leaves have black spots and the leaves fall off. What's the matter? (pictured) Hello! Pepper leaf spot is fungal and bacterial. You can't see the symptoms of pathogens in the photos. You can spray some copper preparation.
The newly dug orchid leaves are white. What happened? There is something called ghost grass, that is, the leaves of orchids are all white, with no green at all. This kind of grass is difficult to grow because it can't carry out photosynthesis, and what awaits it is death. There is another situation, that is, leaves are covered with fallen leaves for a long time, and the leaves will turn white when they don't see light, and will gradually turn green when they see light.
The main reasons for yellowing and zooming of leaves are: (1) watering. Too much water will make the basin soil too wet for a long time, even accumulate water, and the soil will lack oxygen, which will lead to the decay of some fibrous roots, hinder normal breathing and nutrient absorption, and make the leaves gradually turn yellow and fall off. (2) fertilization. Long-term fertilization, or long-term non-replacement of pots and soil, lack of nutrients such as nitrogen in the soil, resulting in sparse branches and leaves, thinning and yellowing of leaves. In addition, excessive fertilization will cause new leaves to be thick and uneven, and old leaves will fall off in brown. In case of this phenomenon, the fertilization should be stopped immediately, the watering amount should be increased, and some old soil should be removed and replaced with new cultivated soil for normal management. (3) temperature. Summer is hot, such as placing flowers that like to enjoy the cool, such as Clivia, Cyclamen, Begonia and so on. Direct sunlight in a high temperature place is likely to cause the tip or edge of young leaves to burn or the leaves to fall off. In winter, if the room temperature is too low, evergreen flowers and trees introduced from the south will be slightly frozen and their leaves will turn yellow. If the room temperature is too high, the transpiration of plants will be too high, the water and nutrients in the roots will be insufficient, and the leaves will turn yellow. (4) soil. The soil and water in most parts of the north contain more saline-alkali, and they like flowers in acidic soil, such as camellia, rhododendron, orchid, Michelia, Gardenia, Osmanthus fragrans, Eupatorium odoratum and Magnolia grandiflora. Will gradually turn green and yellow because of the lack of soluble iron that plants need to absorb in the soil. Due to the acidity of the soil in the south, magnesium is easy to be lost, and the veins of the old leaves of plants lacking magnesium often appear bluish yellow.
Pumpkin leaves are all white. What happened? Hello! Do you have powdery mildew?
What's the matter with spots on soybean leaves? As shown in the figure, caused by bacterial leaf spot infection of soybean, waterlogging spots are formed on the leaves, which turn into brown or black polygonal spots after development, with yellow-green halo on the edge. The sick leaf was broken. The stems and petioles are diseased and produce dark brown stripes. Control with clothianidin or agricultural streptomycin or zhongshengmycin or copper rosin or copper quinoline.
The leaves are white chrysanthemums. Did you say chrysanthemum? Baidu compares it.
How can many white Mao Mao grow on the leaves of Anthurium andraeanum? It could be powdery mildew. There are round white spots on the surface of leaves. Generally, there are more lower leaves than upper leaves, and more leaves behind than before.
The leaves of flowers are all white. This is whitefly, also known as white moth. It belongs to the HOMOPTERA whitefly family. It is a worldwide pest, which occurs all over China. It is an important pest for planting crops in vegetable fields, fields, greenhouses and greenhouses. The host range is wide. Cucumber, kidney bean, eggplant, tomato, pepper, wax gourd, beans, lettuce, Chinese cabbage, celery, green onion, etc. It can be harmful to vegetables, but also to flowers, fruit trees, medicinal herbs, grasses, tobacco and other 653 species of plants in 1 12 families.
Whitefly
Formula: phenoxy high chlorine+dinotefuran+whitefly repellent.
Features: domestic exclusive formula, quick-acting, killing insects and eggs, lasting for 25 days. It can control whiteflies such as whitefly, rice planthopper and Bemisia tabaci. Green exports of vegetables, rice and cotton have no resistance.
If you can accept this answer, please adopt it.