In the past two years, northeastern northeast China has suffered from rare corn armyworm pests. More than 9 million mu of farmland has been eaten by corn armyworms. Corn worm larvae of 6 years old or older can eat corn leaves in three days, directly causing corn 80. % of production is reduced, or even lost. Nowadays, when the cornworms broke out, farmers’ friends should quickly do the prevention and control of corn armyworms!
Harmful symptoms of corn armyworm
Corn armyworm is also called a marching insect. It mainly eats corn leaves by larvae. When it occurs seriously, it will eat light leaves in a short period of time, resulting in reduced production or even no harvest. The symptoms are mainly caused by larvae biting the leaves.
1 to 2 instar larvae feeding on leaves to create holes
Irregular nicks appear after the larvae above 3 years old endanger the leaves
Eat light blades when eating
When the big occurrence occurs, the corn leaves are eaten up, only the veins are left, causing severe production reduction or even rejection.
When a corn field is eaten up, the larvae often move into a group of fields and become a victim of the field. Generally, the terrain is low, the corn plants are uneven, and the weeds are heavily damaged.
Maize armyworm occurrence condition
1. The high density of corn planting causes the corn field to be moist and warm, creating a breeding ground for the armyworm.
2. There are many precipitation processes, the soil and air humidity are large, and the meteorological conditions are very conducive to the occurrence of the armyworm in the summer corn field.
3. Excessive use of pesticides leads to increased resistance of armyworms. It is difficult to kill highly resistant pests by conventional drugs. The armyworms rapidly multiply in the short term, and even the second and third generations are like biochemical crisis.
4. The number of natural enemies is reduced. The natural enemies are mainly walking armor, frogs, birds, parasitic wasps, parasitic flies and so on.
Corn armyworm control measures
I. Agricultural control
1. Remove field wheat straw and use it as fuel or heap for composting to kill the insects that are lurking in the stalk. Reasonable rotation, not suitable for continuous cropping, shallow tillage and mites, reducing the number of adult bases.
2. Mining and attracting eggs. During the spawning of the armyworm, according to the spawning characteristics of the adult, continuous egg vaccination or removal of the egg mass in the field can significantly reduce the number of eggs and the number of larvae.
3. Artificial killing and cultivating and weeding to eliminate larvae. During the occurrence of armyworm larvae, weeding and larvae can be used to turn weeds and larvae under the soil to kill larvae, which also reduces the humidity in the field and increases the larval mortality.
Second, biological control
1. Protection and utilization of natural enemies: There are many natural enemies of the armyworm, which have certain natural control effects on the occurrence of armyworms, such as frogs, birds, bats, spiders, predatory insects, parasitic wasps, etc.
2. The application of biological pesticide Beauveria bassiana can significantly reduce the damage.
Third, physical prevention
During the adulthood, a 5 cm diameter grass handle was inserted in the field, and every 10 meters was inserted. Every morning, the grass was covered with a plastic bag to catch the sticky moths lurking in the straw. It is also possible to set up sweet and sour liquid in the field to trap adult insects with a pot distance of about 500 meters. Preparation of sweet and sour liquid: 1.5 parts of brown sugar, 2 parts of edible vinegar, 0.5 parts of white wine, 1 part of water, plus appropriate amount of trichlorfon or other insecticide.
Fourth, chemical control
1. Mix bait trapping method. The summer corn field that is sown and sown can be used with 200% of 90% trichlorfon, mixed with fried bran or fried cotton cake 10 kg, and used in the evening to spread the corn to kill and control.
2. Spray control can use 2.5% Kungfu EC 3000 times solution, 4.5% beta-cypermethrin EC 1500 times solution, 48% chlorpyrifos EC 1000 times solution, one of the above-mentioned agents, 40 to 50 kg per acre. When the age of the insects is large, it is necessary to increase the amount of medicine used and the amount of water sprayed. Spraying time is best chosen in the morning or evening to improve control.
Recommendation for the prevention and treatment of corn worms: a vitamin salt + phoxim + cyhalothrin; avermectin + chlorpyrifos + cyfluthrin.
In the process of prevention and control of corn armyworms, it is necessary to timely grasp the information on the monitoring and monitoring of insects released by the local plant protection department, so as to achieve early detection and early prevention and control, and try to control the corn armyworms before the third age. The prevention time is generally selected from the high-risk time of larvae feeding in the morning and evening; the spraying part is applied as much as possible in the corn heart.
Five major pest damage symptoms and control methods for corn
Corn pests have a very large impact on the growth and yield of corn. If the corn pest control work is not done well, it will directly cause the loss of corn production or even the harvest. The following small series will introduce you to the other five major pests and control methods.
First, corn hummer
Corn thrips are the main pests in the corn seedling stage. Adults and larvae are more harmful in the young parts of the corn, and the heart leaves are more serious. The hazard period is concentrated in the middle and late June and early July. The adult and larvae often overlap in the field. At this time, the corn is mostly 3-5 leaf stage. After the corn is killed, the light leaves are twisted and broken, and the heavy corn seedlings are destroyed, forming multiple branches and not being able to bear ears.
Control method: When the rate of the victim in the second half of June is 2 to 3%, the drug is controlled by the drug: 4.5% beta-cypermethrin or 10% imidacloprid and its compounding agent 1000 times liquid spray control.
Second, corn mites
Corn borers are also known as corn grits. Corn borers are mainly distributed in northeast, north, east, central and southwest, directly affecting photosynthesis and pollination of maize, and can spread viruses, causing corn dwarf mosaic disease, while large numbers of aphids Absorbing juice, making the water and nutrient supply of corn plants dysfunctional, affecting normal grain filling, resulting in increased sputum granules, decreased grain weight, and even no rods. Can cause corn to reduce production by more than 30%.
Control method: seedling stage and early stage of tasseling are the key period for controlling corn mites. If more mites are found, use 10% imidacloprid WP 1000 times solution, 10% beta-cypermethrin EC 2000 times solution, 2.5% cyhalothrin 2500 times solution or 50% anti-Pu Wei WP 2000 times solution, 25% thiamethoxam water dispersant 6000 times solution and other sprays.
Third, the corn ash
The main hazard of the brown planthopper on corn is the spread of the corn rough disease virus. Once the corn is infected, it is almost uncontrollable. The lighter is reduced by more than 30% and the crop is severely rejected. Therefore, the corn rough disease is also called corn cancer.
Control method: 10% imidacloprid 20g/mu or 3% acetamiprid 15-20g/mu, mixed with 4.5% high-efficiency chlorinated cyanide 20-30ml/mu and other pyrethroid pesticide sprays, also available Wei, Rui Jin special pesticide spray, once every 3-4 days, even spray 2-3 times. Pay attention to spraying the weeds on the edge of the field and the ground, not just spraying the corn plants.
Fourth, corn swedish fly
Corn swedish flies are a new pest that harms summer corn. The Swedish stalk flies are close to the growth point of the corn heart, which is curled. When mixed with the corn thrips, it often causes the top leaves to roll together to form a "whip", which cannot be unfolded, resulting in slow plant growth.
Control method: When the rate of harmful plants in the middle and late June is 2 to 3%, the drug is used for prevention and treatment. Control drugs, imidacloprid, acetamiprid, beta-cypermethrin and its compounding agent.
V. Corn cultivating sunflower
Corn cultivating sunflower seedlings, seedling stage damage, generally in mid-July, with nymphs or female adults concentrated in the roots of corn plants, stem base, lower sheath sheath feeding sap. The growth of the damaged plants is blocked, the leaves are yellow, the plants are short and weak, the growth is slow, the leaves at the base are dry, and the plants are wilting when severe. The plant is pulled up and many small black spots are visible in the roots. In severe cases, the roots become swollen and turn brown or black, or even rot.
Control method: The plot of corn ploughed in the seedling stage is irrigated with 40% phoxim emulsifiable concentrate 1000 times solution or 48% chlorpyrifos emulsifiable concentrate 1500 times in the seedling stage.
The above is the main pest of corn, must be prevented in advance!
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