The rice water is like a coleoptera, like a family, a small subfamily, a genus. It mainly harms rice and also harms some grasses. Gramineous crops, weeds and other plants such as corn. Adults and larvae of the rice water weevil are harmful to rice. Adults feed on the leaves and eat the mesophyll along the rice veins. They usually feed from the front. The leaves that are fed only have a transparent epidermis, so white strips are formed on the leaves. Spotted, larvae bite the roots of rice, and many broken roots can be seen when the damaged plants are pulled up and rinsed. The roots of the damaged plants are slightly blackened and rotted. The damaged plants are easy to fall, short, weak in absorption, yellow and thin, and the number of tillers is obviously reduced. Deadly seedlings, severe cuts.
Rice water weevil is a semi-aquatic insect. One generation a year, adults overwinter in straw, rice blast, paddy field grass weeds, and glutinous soil. Overwintering adult worms begin to recover when the temperature reaches 10 °C in spring, and they are harmful to the early spring grass weeds (mainly reeds, wild oats, cattails, etc.) before rice transplanting, and some of the corn is transferred to corn after emergence. After rice transplanting, they will enter the rice field and carry out the hazard. In late May, a large amount of rice was invaded into the rice field. The amount of rice seedlings near the field was large. Adults could swim in the water and feed on the rice seedlings. The adults fed the leaves to form white strips with a width of about 0.5 mm and a length of 3 cm or less. The eggs are produced in the sheath or root tissue below the surface of the water. The egg stage is 7 days, the larvae are 4 years old, and the larval stage is 30-45 days. The young larvae feed on the rice roots, and the older larvae bite the rice roots. The larvae are in the stagnation period. The larvae are used for soil mites and pupa. The pupa period is 10 days. In the middle and late July, the new generation of adults is in the peak of emergence. In August, most of the adults gradually migrated to the weeds around the rice fields, ready for wintering. The control methods are divided into four methods: agricultural control, physical control, biological control, and chemical control.
First, agricultural control: 1, reasonable fertilization. In rice fields with more fertilization, the amount of larvae is large and increases linearly. Therefore, when fertilization is selected, reasonable fertilization can reduce the density of insect population. 2. Remove weeds. In the spring, the wintering adults did not transfer to the rice fields before, during the autumn and winter, the surrounding weeds were removed and burned, so that they lost the wintering place and directly eliminated the pests. 3. The key areas of the rice water weevil epidemic will be isolated, and the water will be changed to drought, or other non-host crops will be replanted to establish a safe buffer isolation zone. 4, through the autumn land, spring and other agricultural operations to eliminate the overwintering adults. Second, physical control
The rice water weevil has the characteristics of phototaxis, and the black light is set to trap and kill; the trapping field can also be set, and the nighttime lighting can induce the insects to lay eggs and then eliminate them centrally. Third, biological control: raising ducks in rice fields can significantly reduce the damage of rice water weevil. Fourth, chemical prevention
Grasping the weak link in the life history of the rice water weevil, we will focus on the prevention and control of wintering adults and a new generation of adults. The prevention and control of wintering adults was carried out in the early stage of June, and the control larvae were carried out in the late larvae in late July to control a new generation of adults, which was carried out around August 20.
Control agents:
1, 28% hyperosmotic rice Lefeng emulsifiable concentrate, 680 ml per hectare, sprayed with 750 kg of water; 2, 36.8% Uighur rice emulsifiable concentrate, 750-900 ml per hectare, sprayed with 450 kg of water, or 1800 ml per hectare Mix the soil and spread it. The best time to apply the drug is evening; 3, the elephant is quick to kill emulsifiable oil, 533 ml per hectare, diluted with water 1000-1500 times liquid spray; 4, like a net emulsifiable concentrate, 450 ml per hectare, 450 kg water, spray 5, Twilight emulsifiable concentrate, 1500 ml per hectare, each bottle is filled with water; 6, sputum emulsifiable concentrate, 600-900 ml per hectare, directly sprinkled in the paddy field or evenly sprayed with 450-750 kg of water. The best time to apply is afternoon.
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