High-resolution map of rice negative mud worms and prevention methods
The high-resolution map of rice negative mud worms and its control methods, rice negative mud worms are widely distributed, and are important pests of rice in China, which are harmful seedlings and seedlings of rice fields. Adults and larvae feed on the veins along the veins, and the epidermis is eaten in the tip of the leaves. All the seedlings that suffered serious damage in the first year of the year turned white, or caused the growth of the seedlings to be weak, the heading was uneven, and the rice was reduced. In addition to harming rice, the affected crops are millet, alfalfa, wheat, barley, corn, reed, alfalfa and alfalfa.
Living habits of rice negative mud worms (1) Adult worms: Adults enjoy a cool and humid environment, and the morning and cloudy days are the most active. Overwintering adult worms after mating, can lay eggs many times. The eggs are produced on the front of the leaves about 3 cm from the tip. They are also produced in the sheath and leaf back. Each female produces several to 10 capsules per flower, which is arranged in two rows along the veins. It is also scattered. Oviposition of dozens to more than 100 tablets. When the new adult worms did not pay the eggs in the same year, they would migrate to the fields to find the crouching place after they took the rice. The migration of the adults could also be carried by the water.
(2) Larva: Eggs hatch in the morning. The larvae are very lively when exposed to the morning, concentrated on the front and tip of the rice leaf, and hidden in the backlight when the sun is violent. The larvae often carry a fecal block in addition to the front and back of the suede. The mature larvae remove the excrement, climb to a suitable place, spit out a white gelatinous substance as a cockroach, hide it, and turn it into cockroaches after about 2 to 4 days. The larval period is 10 to 15 days.
The occurrence of rice negative mud worms (1) Generation generation: One generation occurs in all parts of China every year.
(2) Overwintering and insect sources: Overwintering of the grassy weeds and their rhizosphere soils at the edge of the leeward and gully near the rice fields. It is the majority in the reeds, thatch and its incisions. It is often clustered during winter.
(3) Occurrence period: In the southern rice area, the overwintering adults resumed activities from March to April, and from the end of April to the beginning of May, they were active at the beginning of the period, and the grass weeds such as grasses near the crouching place were taken at the beginning, and then moved. Into the rice field and Honda, mating and spawning, the larvae feed after eating, the disease is from April to June, and the larvae in mid-to-late May are harmful to the early rice Honda. In late May and early June, phlegm began to degenerate. In June, the number of new adults that emerged in the middle of June was increasing.
(4) Occurrence factors: 1 climatic factors. Winter and spring are warm and rainy, suitable for wintering adults to survive, the base is large, and the occurrence is early, and the damage will be aggravated. Rainy from April to June is also beneficial to its occurrence, while high temperature has its inhibitory effect. 2 cultivation factors. It occurs mostly in mountainous and semi-mountainous areas, especially in the valleys of shady slopes. Rice fields that are far away from the mountains and have plenty of sunshine are less likely to occur. Plain areas rarely occur or even occur.
Rice negative mudworm control method Rice negative mud worms are the most active in the morning and cloudy days, prefer to be cool and humid, mostly in the mountainous areas of the mountains, with adults overwintering. The prevention methods are as follows:
(1) Combine with fertilizer, remove weeds in winter and spring, and kill overwintering adults.
(2) Combine cultivating, first use bamboo rafts to crush the larvae into the soil.
(3) Chemical control: use 20% chrysanthemum emulsifiable concentrate 50ml or 30% high-efficiency triazophos 100-150ml or 20% fast-killing 35-40ml water 50kg spray.
This article URL: HD map of rice negative mud worms and prevention methods
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