A letter from a reader of Shen Miaosheng, Jining City, Shandong Province asked: I have a pot of gardenia that has been conserved for many years, and it is growing gratifyingly. However, when I returned home a few days later, I found that many flower buds had shrivelled and died and found a lot of powder on the back of the leaves. What is this disease (bug) and how should it be controlled?
Answer: Inferred from the white waxy residue attached to the leaves you sent, it should be caused by the whitefly type test, and the “mellow†secreted by it will induce coal pollution. The cause of your wilting and wilting in the gardenia of your gardenia cannot be simply attributed to insect pests. It may not be watered well when you go out, and the potted plants spend a long time in conditions of poor ventilation, air permeability, and visible light. In the relevant. The whitefly parasitized on the gardenia has lost its living parasites, leaving only flaky residues and foliar coal smears. It can be seen that the parasitic damage time is not ten and a half months, but it has been longer. Just hidden in the back of the leaf, you can't find it in time. Its parasitism is related to poor ventilation, poor ventilation, and poor light. The wilting and necrosis of flower buds has a certain relationship with the parasitism of this insect, but it is not the root cause of sudden death. Parasitic dust mites can cause poor plant growth, resulting in reduced ability to resist pests and diseases, thereby accelerating wilting and necrosis of flowers. The wilting and necrosis of calyx may be related to the fact that the basin soil was too dry or too wet (or watered after it was too dry) in the recent period, the air was dry, the environment was sultry, and the fertilizer was misapplied.
For your susceptible flower strains, you can remove them from the pots, remove all the size buds, reduce the loss of nutrients in the plants, carefully inspect the roots, if the roots of the thin and thin roots do not appear too much necrosis, can be replaced loose fertile Well-drained acid culture soil is planted. If there is more browning and necrosis in the root system, the dead root system can be cut off, and the twigs are also properly cut to ensure that the roots absorb moisture and the leaves evaporate water. Balance and replant it. The white waxy residue on its branches can be wiped off (or brushed off) with a damp cloth or a fine-bristled brush, including wiping its black coal smear layer. Place it in a well-ventilated, semi-shady cool place, keep the potted soil moist, do not over-water, often watering with water spray, and promote plant growth as soon as possible. In order to prevent the parasitic parasites from re-parasitism, in addition to the need to pay attention to the ventilation of the environment, but also regularly check the back of the leaves, found that the insects in time to wipe it, but also after the spring out of the house, every half months after spraying One time, 25% of buprofezine WP 200 times, 2 times in succession, or use 10% of imidacloprid WP 2000 times to spray the front and back of leaves, once every half month, 2 times to 3 times in succession.
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