Red spider and white spider
The mites that damage apple leaves mainly include hawthorn leafhoppers, cinnabar leafhoppers, apple all-claws and two-leafhoppers. According to their body color, we will collectively call the first three species of red spiders and the two species of white-spotted spiders known as white spiders. Because white spiders occur less often, the fruit growers that have been on the go will mistakenly believe that the pests are red spiders.
The living habits and control methods of red spiders and white spiders are similar, but white spiders are highly resistant to traditional acaricides such as triazolyl, which is why many fruit farmers have failed to control the effect of red spiders. Abamectin and etomizole are effective against white spiders, and it is effective only for pups and crickets, and it has no killing effect on adult pupae, which can only lead to infertility. Therefore, we must correctly distinguish between orchard management and avoid using the wrong medicine.
Characteristics of the damage of red spider and white spider
Characteristics of the damage of red spider: After the leaves are damaged, many small spots of chlorosis will appear first, and then enlarge and connect into pieces. When the leaves are serious, the whole leaves will become brown and then fall off. The hawthorn leaves will spawn at the back of the leaves and the apple will be spawned. There is no net habit but leaves many flaws on the leaves.
The white spider's infestation features: The affected leaves first appear pale spots from both sides of the main veins of the petiole, and as the damage increases, the leaves become pale and dark brown, and the toads also release toxins or growth regulators, causing Unbalanced growth of plants leads to the appearance of uneven symptoms in young leaves. The two-leafhoppers have a strong set of inhabiting characteristics. Sometimes, the nets can cover the entire leaf and can be woven into the petiole. Even the filaments can be bridged between the tree strains.
Medication details
Anthraquinones mainly harm the backsides of the leaves in the middle and lower parts of the trees and the inner canopy. The upper part of the crown is only 10%, the middle part is 17.7%, the lower part is 40%, and the inner part is 32.3%. These living habits of crickets determine that we must pay attention to some of the details of our control.
First, the back of the blade should be administered when spraying. Secondly, when spraying the medicine, it focuses on the use of medicines in the lower part of the tree and in the inner part of the tree. Finally, choose medications that are active in the early morning or late evening. As long as the red and white spiders are correctly distinguished, the proper medicines are selected, and the methods of reasonable prevention and treatment are adopted. The damage of fleas is completely controllable.
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