Grass greedy night moth known as "grain killer", how to prevent and control, to ensure high yield of corn?

Grass greedy night moth for foreign invasive pests, the insect pests on crop damage is great, known as the "grain killer". The pest reproduces fast, the geographical adaptability is strong, and the population density is large, the corn yield and quality of the impact is great.

In the spirit of scientific disease control concept, the following introduction to the grass greedy night moth damage to corn, on this basis, respectively, since the agricultural control measures, physical and chemical control measures, biological control measures, chemical control measures and other aspects of the grass greedy night moth green ecological environmental protection prevention and control technology to do the main points of the exposition, in order to reduce the base of the insect pests to ensure that the corn high-yield yield and excellent production to provide theoretical and technical guidance.

1 grass greedy night moth on the harm of corn

grass greedy night moth for foreign invasive pests, the insect pests on crops is very great, known as the "grain killer". Since the prevalence of this pest seems to be characterized by fast reproduction, strong geographical adaptability, and high population density. In the different growth period, to the damage of young insects, large appetite, devouring corn, wheat, peanut kernels, etc., resulting in no level of limited production, or even nothing.

The pest is dominated by feeding on the corn heart and leaves, and generally the low-aged insect pests, with the majority of cluster infestation method. The heartleaves of corn are slowly becoming fully transparent as a result of the influence of the younger, lower-aged infestations. The impact of large-aged pests will immediately drill and feed on the heart leaves of corn, harming the corn's flower ears, male ears and these. At the same time, a lot of fecal material can be seen around the leaves. In comparison, the large age of the young insects is more harmful, violent carnivorous, not easy to be found, then control has a certain difficulty factor.

Particularly the 6th instar larvae, with a strong violent carnivorous, if not properly handled, will lead to significant damage to corn in a short period of time, more serious and even cause the death of corn plants. In addition, the grass greedy nightshade moth has the characteristic of trans-plant damage. It is a serious damage to maize, and the lawn moth has a wide range of damage to maize, with the characteristics of fast migration, since 2016 in Nigeria, since the discovery, just 2 years time has been 44 our country affected by its damage, as of May 2019.

In China, there are already 18 provinces and cities of corn suffered from the grass greedy night moth, the damage area reached 3 million mu, especially in Yunnan region, there are some places where a large area of corn plant death. It is not difficult to see, if there is no early manipulation of the grass covetous night moth, not only will immediately block the development of modern agriculture in Yunnan. It will also have a greater impact on China's economic growth.

2 Preventive and control measures of the grass greedy night moth 2.1 Agricultural control measures

Select resistant species, optimize field management, improve field moisture, fertility, and enhance the ability of corn to resist pests. Adjust the maize sowing period, moderately advance the sowing period, so that the seedling period is separated from the egg-laying period of the larvae, which can reduce the larvae's impact on the maize host plant. Enrich the field crop diversity, moderate cross planting of other types of green plants, to create a suitable natural environment for the natural enemies to be able to reproduce, can inhibit the spread of insect pest reproduction.

Adjusting agricultural control measures according to the cultivated area. Large-scale agricultural cooperatives and planting cooperatives can plant some crops that can expel pests in the field to resist the spread of pests. Small land in the maize field, should be taken to plant resistant species, strengthen field management, adjust the sowing period of these, in order to avoid the production of this pest.

2.2 Physical and chemical control measures

Physical and chemical control measures, according to the biological characteristics of the insect pests and the development of trapping and killing measures. For example: the use of insecticidal lamps, sugar cool liquid, sex lure these, can complete the attraction of the waking insects to eliminate. The use of black light, food lure, sex lure these, reduce the total number of insect pests to resist the total number of eggs, and complete the generation of pest manipulation purposes.

In some areas, the use of crushed stone, grass ash, which is promoted in the heart and leaves of corn, can also have the purpose of removing insects, but the effect is relatively low. Or, spraying red bean sugar water to seduce small ants and capture greedy night moths, also has the practical effect of removing insects, but the high efficiency are not high.

2.3 Biological control measures

Biological control measures, relying on natural enemies, organic pesticides and other manipulation of pests. In nature, there are more types of natural enemies of the grass greedy night moth, such as: search engine spiders, small ants, lacewings, night moth black eggs wasp, island beetle abdominal cocoon wasp, all of these, can supplement the greedy night moth. Therefore, it is important to improve the natural environment of the field to attract natural enemies according to the ecological adjustment. Or, try to introduce new types of natural enemies from other places, and then spread them to the field after experimental scientific research in order to control the pests.

In addition, the use of the red-eye wasp to control this pest in China has been very effective. In the future, it is important to select the species of red-eyed wasps that are very effective in surviving the larvae of the night crawler, so as to reduce the number of infestations. In addition to natural enemies, there are also some antiviral drugs, such as bacteria, white fungus, green fungus, which have very good practical effect in the manipulation of the lawn moth.

2.4 Chemical Control Measures

Chemical control, the key use of chemicals, with the purpose of repellent insect pests. Compared with other control measures, chemical control has been used for a long time, but it has been attacked by people all over the world because of the side effects caused to nearby green plants and beneficial insects, which jeopardize the biodiversity. Common effective chemicals are acetamiprid and cyfluthrin.

In the green ecological control considerations, the use of chemicals should be reasonable and moderate. At the same time, to control the timing of the drug. General corn heart leaves in the early stage, the infested plant 20%, is the golden time to use the drug. The actual amount of medicine, according to the crop sense of seven conditions, there are selective adjustments to the strategic approach to drug delivery.

3Summary of experience

Since the above brief description of the pests, it seems that the grass greedy night moth is known as "grain killer" due to its large surface, fast reproduction speed, strong adaptability to the region and high density of the insect population. In the different growth period of the grass greedy night moth, the damage of the young insects is greater, the lower the age of the pest damage is greater, with a large appetite to feed on the corn heart and leaves as the dominant. In the past, the control of this pest, the use of chemicals as the dominant, but, because of the drug residue, jeopardizing the ecological and environmental protection and the public attacked.

In the spirit of green, ecological, environmentally friendly concept of prevention and control, integrated grass green night moth prevention and control technology, should implement good agricultural control measures, pay attention to the selection of resistant varieties, optimize field management, adjusting the maize sowing period. Effective use of biological control measures, enrichment of field crops to attract natural enemies, and promote the rational use of biological agents.

Reasonable use of physical and chemical control measures, according to the biological characteristics of the insect pests and the development of trapping and killing measures. At the same time, the role of chemical control can not be ignored, and strive to be reasonable and moderate. At the same time, to control the timing of the use of drugs, in order to effectively reduce pesticide residues, to ensure the quality and effectiveness of green control.