Grasses harm various kinds of garden trees. Adults and nymphs suck the nutrient solution of the host plants with sucking mouthparts. Excreted honeydew dew can cause serious pneumoconiosis, making the leaves of plants become dark, especially the inner litchi is more serious, inhibiting trees. Grow and reduce the ornamental value of trees. The parasites often crawl around and pollute the environment. The honeydew produced is contaminated by human skin. It can also cause allergic reactions and threaten human health. Must take advantage of the opportunity to carry out comprehensive prevention and control of grass mediated.
I. Morphological characteristics and habits
(1) Adults: Females are wingless, 8-15 mm in length, flat and oval in shape, light grayish brown, grayish purple in the middle of the back of the body, and light yellow in the outer part. The back of the body has a layer of white wax powder with transverse wrinkles and longitudinal grooves in the abdomen. Similar to the sandals, it is called grass mediated. Male pair with wings, pale black, body reddish purple, body length 5 mm. (2) Eggs: oblong, yellow-white to red-yellow, oocysts white cotton wool, about 15 mm long. (3) Nymphs: gray-brown, similar in appearance to females, but smaller. (4) Poria: purple, hidden in white waxy enamel.
The host plants introduced by Cao Zhi mainly include Fatong, Pterocarya falciparum, French holly, hackberry, and Zuzi.
One year after generation of the grass, the egg is overwintering in the soil, the wall gap, the gutter seam, the bark, and the tree hole in the soil near the trees. From late January to early February, eggs hatch. From late March to mid-April, it was the endangered period of the upper tree, and the nymphs crawled along the trunk to the shoots of the young shoots. In late April, the males and females became pupa and became adults in early May. At this time, the females became adult females after the third molting and started spawning in mid-May after copulation. Each female lays over 100 eggs. grain. After hatching in the summer, autumn and winter, the eggs hatch before and after the spring.
Second, prevention and control measures
1. Deeply plunge the soil around the trees in winter to kill the oocysts hidden in the soil and eliminate the eggs that are overwintering. The oocysts are usually buried about 3 cm deep and can even remove the upper layer if necessary.
2. From late January to early February, when the nymphs hatch on the tree, on the tree trunks 0.6 to 1 m above the ground, scrape the old skin or smooth out the cracks in the bark with a mud, and use a plastic film to form a circular isolation. Belt, and apply waste engine oil on it to stop the nymphs from getting on the tree. Afterwards it is much easier to clear the nymphs under the ring. This method is applicable to the prevention and treatment of tall trees and grasses. It neither pollutes the environment nor is easy to operate and costs less.
3. Observe the nymph hatching situation carefully and carry out drug prevention and treatment as soon as possible. The nymphs were sprayed with 4.5% beta-cypermethrin 1000-fold after they were added to the trees. At this time, because the leaves of the trees are less and the drug is difficult to adhere to, it is necessary to add 0.1% of the neutral detergent powder during spraying, and it is better to spray once more to spray the insects once a week. Chemical control must catch a good fighter. Once the nymph climbs to the top of a tall tree, or becomes a cockroach and an adult, the difficulty of prevention and control is greatly increased, and the effect of prevention and control cannot be guaranteed.
4, strengthen management, improve plant resistance.
In addition, due to the wide range of grasses and host plants, we may have found new hosts when we focus on their common hosts. Therefore, we must carefully observe whether or not the surrounding trees are attacked by the grass during its introduction and fight for it. Control as low as possible.
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