How scale insects do harm to spider clam
A letter from a reader of Wang Peilan, Xingguo County, Jiangxi Province asked: I have planted more than 100 potted crab claws. There are many white spots on the flattened leafy stalks. The scion part of the plant has almost all died. Its rootstock cactus or triangular arrow also died. Is this pest or disease? How to prevent it? A: From the point of view of the specimens sent to you by mail, it can be determined that it is pests rather than diseases, which are mainly caused by the damage of scale insects. There are both white shields and corner waxes on them. Because scale insects have a thick waxy layer on the body surface, it is difficult for insecticides to penetrate the waxy layer to kill live insects. Therefore, it is a kind of stubborn insect pest. Prevention can be started from the following aspects: The first is to purchase flower buds such as crab claws and fairy fingers, and check repeatedly to see whether their scions and rootstocks (cactus or triquetrous arrows) are attached to the living body of scale insects. It must be erased as soon as possible to prevent the spread to other flowering plants. Second, do not place the plants of the cactus or cactus next to the flowers that have been infected with scale insects or under the plants in order to prevent the insects from migrating and parasitizing to plants without pests. The third is to pay attention to ventilation and light transmission, to create a good environmental conditions, so that plants are not easily harmed by scale insects. Fourth, if there is a small amount of worms on the plants, the worm body should be brushed off in time with a brush, or the living worm body adhered to the phyllo-cylindrical stems can be scraped off with bamboo and rinsed with clean water. It is very convenient to stick live insects with transparent tape. If there are many worms, they can use 50% of malathion EC 1000 times, or 25% of DBP WP 2000 times, or 40% of SC 1000 The liquid is evenly sprayed on both sides of the plant. The effect is also very good.
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