Insects of rice weevil infestation damage rice leaves, and they feed on leaf veins in the direction of veins on young leaves, leaving the epidermis forming sliver white stripes of varying lengths. The length is generally not more than 3 cm, and both ends of the strips are curved. When the damage is severe, all fields are white. The larvae of the water weevil larvae feed on the roots of rice, causing more serious damage, also known as rice root elephants. 1~3rd instar larvae grazing in the roots, crawled out of the roots after 4th inoculation, the roots soon became black and rot, lightly reduced rice tillers, yellow and thin plants, dwarfed, severely collapsed with wind, even with the wind Float up, resulting in an unrequited harvest.
The elephant armor gets its name from the fact that they have a long beak like an elephant's nose. The larvae of rice water weevil are as long as the prosthodontic plate, slightly curved, and flat-cylindrical; there are knobs between the ends of the elytra; the body is brown, densely interconnected gray scales, and the pronotum and elytra The area has no scales and dark brown spots. About 3 mm long, white. Larvae have a body length of 10 mm, white, yellow-brown head, and no feet. Eggs are produced below the waterline, cylindrical and round at both ends.
The rice water weevil has a complex feeding habit, and its host range is very wide. It includes grasses, azaleas, communis, sedges, rushes, and semi-aquatic insects. Adults overwinter on the surface of grass, in our country can parthenogenetic. The average life span of adults is 76 days, and females live longer, up to 156 days.
Prevention and control of rice water weevil must first strictly implement quarantine. It is forbidden to transfer seedlings, rice straw, rice and other host plants and their products from infected areas, and no host plants are used as filling materials. Appropriate inspections should be conducted regularly in suitable areas and suitable places, and efforts should be made to early detection and early elimination. In the area where it has occurred, the following preventive measures must be taken:
Autumn ploughing and ploughing, removing weeds in the fields and the ditch, reducing overwintering adults.
It is forbidden to transport rice, seedlings, seeds and straw outwards and consciously implement quarantine laws and regulations.
Timely chemical control. Focus on the prevention and treatment of overwintering adults, treatment of adult worms, and control of larvae; governance of paddy fields, control of the field; governance of early rice, control double night. Can use 5% Rui Jin special emulsion 30 ml / mu of water spray, or the use of thiamethoxam, chlorpyrifos, dimehypo, triazophos and other agents. It is also possible to use 48% of Los Herbs 150ml per mu and 15kg of poisonous soil. Whether spraying or spraying soil, keep shallow water in the field and allow it to dry naturally after application. In addition, setting black light also has a good trapping effect.
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