What are the pest control methods at the seedling stage of millet?

The stage from seedling emergence to jointing of maize is the seedling stage, and the main growth characteristics of this stage are the slow growth of the aboveground part and the rapid growth of the root system.

The central task of field management at seedling stage is to promote root growth, ensure the whole seedling, uniform seedling, and cultivate strong seedlings, so as to lay the foundation for high yield. What are the diseases and insect pests in corn seedlings? How to prevent it? Simple and practical!

First, the prevention and control of diseases at the seedling stage

1. Corn root rot.

Maize root rot is a disease caused by Pythium, which is mainly manifested as the gradual browning, softening and rotting of the mesocotyl and the entire root system, and the root growth is seriously hindered. The plants are dwarfed, the leaves are yellow, and the seedlings die.

When corn encounters rainfall after sowing, causing water accumulation in the soil, it is prone to root rot. Under normal conditions, the incidence of root rot is low and does not cause serious production problems, but under special environmental conditions, there have been cases where the seedling death rate is as high as 80%.

Control methods: pesticide control: In areas where root rot occurs severely, corn seeds should be coated with seed coating containing fungicides, or mixed with fungicides before sowing.

For root rot caused by Fusarium and Rhizoctonia, 75% chlorothalonil wettable powder, 50% carbendazim wettable powder, and 80% mancozeb wettable powder can be used to dress seeds by seed weight, or Weifu seed dressing agent can be used to directly mix seeds.

For Pythium root rot, ovicidal agents should be selected, such as 58% methalene-zinc wettable powder, 64% alum wettable powder, Lvheng No. 1 seed dressing agent and other agents with seed weight.

3. Corn roughness shrinkage disease.

Corn can be infected throughout the growth period, with the seedling stage being the most affected, 5 to 6 leaves can be obvious, and begin to produce transparent oil-soaked greenish dots at the base of the heart leaf and on both sides of the midrib, and gradually spread to the whole leaf. The diseased seedlings are thick green, the leaves are stiff, the width is short and thick, the heart leaves can not be normal, the growth of the diseased plants is stunted, the waxy white raised stripes are produced on the leaf veins on the back of the dwarf leaves, and there is an obvious roughness when touched by hand, the leaves are wide and short and stiff, the leaf color is dark green, the internodes are thick and short, and the parietal leaves are clustered like Junzi Orchid.

Prevention and control methods: First, pesticide seed dressing. Coating and dressing of maize seeds with systemic insecticides can effectively control planthoppers at the seedling stage and reduce the spread of crude shrinkage disease.

When sowing, the use of seed coating agent with 2% seed amount can effectively prevent the harm of planthoppers, and at the same time is conducive to cultivating strong seedlings and improving maize disease resistance. After sowing, the pre-bud soil treatment agent is selected, such as 40% ethyl acetium water suspension, 50% Dua mixture, etc., 550 575 ml per mu, and 30 kg of water is sealed with soil.

At the millet seedling stage, pest control methods include timely and appropriate spraying of pesticides and strengthening management. Disease resistant varieties must be selected, and weeds should be cleaned up before sowing to reduce the source of initial infection.

Seed dressing with pesticides, coating or dressing corn seeds with systemic insecticides, can effectively control pests at the seedling stage and reduce the spread of crude shrinkage disease.

Plant-specific insect repellent can be used to spray evenly on plant leaves. It should not be watered during the medication. Otherwise, it has no effect. You can spray it a few more times and the effect will be better.

Disease characteristics] Millet rust can damage leaves and leaf sheaths, but it is more serious on leaves. In the early stage of the disease, a round or oval reddish-brown bump is produced on both sides of the leaf, especially on the back, and in the later stage, it breaks through the epidermis and is exposed, leaving the epidermis around it, and emitting yellow-brown powder. In severe cases, the summer spores are covered with leaves, causing the leaves to die, the stalks to be soft, the grains to be thin, and to lodging in case of wind and rain, and even to cause extinction.

Occurrence rule] Millet rust generally begins to occur before and after millet heading. In North China, late July to mid-September is the main occurrence period of millet rust. High temperature and rain are conducive to the occurrence of diseases. 7 In August, there was a lot of rainfall and the incidence was severe, and in the drought years, the incidence was mild.

These eight plagues are the main diseases of millet negative mudworm, including millet white hair, grain rust, grain popping, grain stripe spot and millet leaf brown spot. The grayish-brown in the middle and the symptoms of white disease may occur from sowing to maturity, and the affected plants show different symptoms at different stages. Damaged buds: Newly sprouted seeds are infected, and the young shoots are bent, resulting in complete decay before the onset of the disease, resulting in no mud and crystal cutting, mainly cracks, car bodies, corn drills, grains**, leaf sheath white hair in spring beetle fields and other insect diseases and plagues, among which the spring grain field is seriously infested, and the earlier the planting, the more serious the harm.

Leaf and core cardboard and millet ganglia from some heavy fields [disease characteristics] Millet rust may damage leaves and leaves, but it is more severe in leaves. At the beginning of the disease, round or oval reddish-brown protrusions appear on both sides of the leaves, especially on the back. In the later period, almost no millet is a cereal crop, which is an important miscellaneous grain crop in northern China, which has drought resistance and barrenness, short growth period and suitability.

The disease of millet white is one of the main diseases in the growth process of millet, which is a soil-borne disease and is generally developed in the young.

Farmers report severe millet disease. After investigation, the main diseases of millet were white hair, rust, popping disease, plate spot disease and brown streak disease, and the leaves of millet mainly damaged the plate. Grayish-brown in the middle and reddish-brown on the edges.