This year, the rain has been continuous, and the insect pests are not chaotic. Agricultural people fight with the sky and the earth, and the harvest is really difficult! The National Agricultural Technology Center issued a pest and disease monitoring report, indicating that the armyworm was afraid of an outbreak. Some farmland in Guangxi is already staging a scene of armyworm overeating and nibbling on the crops.
Some village rice paddies have been infested with armyworms, and the scene is shocking
In June, it was affected by heavy rainfall, heavy rain and other weather. Floods, urban waterlogging, farmland flooding, landslides and other disasters have occurred in some parts of Guangxi. High temperature and repeated rainy weather, flooding points are easy to form after flooding, which leads to concentrated reproduction and outbreak of armyworms.
Growers generally respond that 5 to 6 years old armyworm is harmful to rice, and only the ears can be eaten in 1 day, reducing yield by 80%; 5 to 6 year old armyworm is harmful to corn, eating into bamboo poles in 3 days, reducing yield by 70%. This is a relatively conservative figure, and some areas do not have a strong sense of prevention, or even a harvest.
<h1>Sticky worms</h1>
The armyworm Lepidoptera Noctuidae, also known as shaving insects, multicolored insects, marching insects, and night bugs. It is a migratory, overeating, omnivorous pest, which is extremely harmful to rice, corn and sugarcane, and needs to be paid great attention to and paid attention to prevention and control.
<h1>Occurrence of hazard habits and patterns:</h1>
Adults emerge diurnally and nocturnally, mostly laying eggs in the middle and lower parts of the crop with dead yellow leaf tips and leaf sheaths, and single females lay 1000-2000 eggs. Adult worms have a strong tendency to sweet and sour solution and black light; Adults have a strong ability to fly and have the characteristics of long-distance migration hazards.
Larvae often migrate in clusters, hence the name "marching insect". The first and second instar larvae only nibble on the flesh of the leaf into a skylight, and after the third instar, they cannibalize along the leaf margin into a missing moment, and when the harm is serious, they eat most of the leaves, leaving only a short midrib; The body color of the larvae changes with age, density, food, and the young larvae feed on the young leaves, the body color is green to gray-green, when the population density is large, the larvae over 4 instars are black or gray-black, and the old mature larvae are 38 mm long, the head is yellowish brown, and there is an "eight" longitudinal shape. There are 5 longitudinal stripes on the back of the body.
The larvae are mostly active in the morning and evening, that is, before sunrise in the morning and around 10 o'clock in the evening. The genus is a medium temperature and good wet insect, the optimal temperature is 19 ~ 23 ° C, the most suitable relative humidity is 50 ~ 80%. It prefers to eat grass crops and weeds, and the amount of food increases year by age, and the five to six years old is the stage of binge eating, which has the characteristics of cluster hazard, binge eating and omnivorous.
<h1>Prevention and control measures</h1>
1. In the process of prevention and control of armyworms, it is necessary to grasp the insect monitoring and early warning information issued by the local plant protection department in a timely manner, so as to achieve early detection and early prevention, and try to control the armyworm before the third age. The control time is generally selected in the morning and evening when the larvae are high.eaten.
2. In addition, armyworms have the habit of being frightened to the ground. When spraying, pay attention to spraying the surface of the ground to eliminate the "worms that slip through the net" that fall on the ground. At the same time, it is also necessary to spray weeds on the side roads of the ground, and strive to eliminate the "extralegal insects" that inhabit there.
3. It can be used for prevention and treatment of methylphenidate, which is a more significant drug with a more significant effect on prevention and treatment at present.