It is necessary to first discover the characteristics of the occurrence of rice thrips and to grasp the law of its occurrence.
In addition to harming rice, rice bran can also damage a variety of grass weeds such as wheat and grass.
Rice thrips is a typical pre-growth pest with the characteristics of greening and concealing. The highest density of insects in the early stage of seedling and tillering is the most serious. The newly hatched nymphs are first hidden in the young leaves of the heart leaf joints, leaf stalks and curled leaf tips, and then scattered on the young leaves. The white leaves to yellowish brown spots appear in the early stage of the damaged leaves, and then the tip of the leaves The volume withered, affecting the normal growth of rice plants. Where the green rice is easy to attract the concentration of the thrips, the damage is heavier; the use of small seedlings with soil transplanting or throwing cockroaches is generally more serious during the tillering period of Honda; the water nursery is seriously damaged in the tiller or Honda tillering period. The 3-leaf to 7-leaf stage is a critical moment for rice and thrips to damage rice. After the round stalk jointing stage of rice, the insect population decreased significantly. Later, the rice leaf tissue hardened. In addition to the small part of the rice locust horse remaining in the inactive tiller and rice ear, most of them were transferred to the late season. In the late rice field, the tender and strong cockroaches are more serious than the old cockroaches, but the late rice field damage is much lighter than the early rice field.
After mastering the above characteristics of rice locusts, it is possible to find rice locusts at an early stage by using the method of checking eggs and measuring insects, because rice locusts are worms with 1-2 nymphs at the tip of the leaf, and the mobility is small. Therefore, the rate of rice leaf rolling is actually determined by the rate of egg strain. Using the egg-hunting method to predict, it is more accurate to grasp the insect situation, it can be 7 to 10 days earlier than the prediction of the leaf-rolling method. According to the correlation between the rate of egg strain and the number of eggs in the field, the survival rate of nymphs hatching and the harm of nymphs to leaves, predicting the rate of leaf rolling to guide field control.
The investigation of the rate of egg strain is simpler and easier than the investigation of the number of eggs. In the survey, a random sampling method was used, which was dispersed in 10 sample points. A total of 100 rice seedlings were taken, and the rice seedlings were pulled up. The egg mass was examined by the plant, and the eggs were examined once every two days. When the egg volume surged, the prediction was made. Calculation. This method is suitable for the prediction of seedlings and Honda insects.
Surgical Gown, Disposable Surgical Gown, Disposable Isolation Gown, Disposable Gown, Sterile Gowns
Ningbo Siny Medical Technology Co., Ltd , https://www.sinymedical.com