In autumn, in addition to the underground pests in the lawn, leaf-eating pests have also entered a peak period of harm, especially several common "nocturnal moth" pests often come out to "demonize", once the outbreak of harm, will add a lot of difficulty to the garden maintenance work, and its form is complex and changeable.
How should these "moths" be distinguished and controlled?
【1】Light Sword Night Moth:
1. Identification characteristics:
Adult: The inner and middle transverse lines of the forewings are black and have a nearly trapezoidal dark brown spot on the wing surface.
Larvae: large changes in body color, gray-brown at the beginning of hatching, reddish-brown head, green after feeding; old mature larvae are cylindrical, the head has a figure-of-eight pattern, and the back of the body has a nearly half-moon shape or triangular black spot in each section of the sub-dorsal line. It is suspended dead, and the shock curls in a "C" shape.
2. Hazard characteristics: When the larvae are 1 to 2 years old, they eat the flesh of young leaves, leaving a transparent leaf epidermis. After the age of 3, the leaves are eaten, eaten into missing carvings, and the young stems are nibbled on the stems of the lawn. After entering the 5 to 6 years of age, the amount of food increased greatly, for the binge eating period, the leaf veins and young stems were eaten, the damage of biting day and night on rainy days and nights, the light caused by yellowing of the lawn, if not prevented in time, it would cause the entire lawn to die when it was serious, which greatly affected the landscape effect.
3, the occurrence of the law: 4-5 generations of occurrence every year, the old mature larvae in the lawn, weeds and other places overwintering, May to October have this insect hazard, generally every year in July to September the 3rd and 4th generation of larvae occur in large quantities, high temperature, dry and lawn is enough to facilitate its growth and reproduction, when the environmental conditions are conducive to its normal development and reproduction, it is easy to break out on the lawn into a disaster.
【2】Twill nocturnal moth:
Adult: The inner and outer transverse lines of the forewings are white, wavy, and there are obvious white oblique broad bands in the middle, so they are called twill noctus.
Larvae: the thorax is varied, from earth yellow to black-green, with less obvious white spots on the surface of the body; the old mature larvae have a black-brown head, no figure-of-eight pattern, and a nearly half-moon or triangular black spot on the inner section of the sub-dorsal line, of which the black spots of the first and eighth abdominal segments are nearly rectangular.
2, hazard characteristics: twill nocturnal moth is an omnivorous pest, mainly to larval harm, with outbreak, insect population density, can eat the lawn into a "light stalk" in a short period of time, for the lighter harm will cause the lawn yellowing, if not timely prevention, serious will cause the lawn to die (see a large number of insect feces under the grass, according to which a large number of larvae can be found at the rhizosphere. ) brings devastating damage.
3, the occurrence of the law: twill nocturnal moth occurs 4-5 generations a year, the hazard peak period is in July-September, but also the highest temperature season of the year; its adults lie out diurnally and nocturnally, daytime in the leaf back or in the soil, evening to the next morning activities, eat lawn leaves, twill nocturnal moth hatching larvae have aggregation, is a key period for prevention and control.
【3】Grassland Nightcrawler:
Adults: Dark brown forewings, greyish-white hindwings, narrow brown bands at the edges, a yellow irregular ring in the middle of the forewings, followed by kidney-like stripes.
Larvae: Generally have 6 ages, the body color is light yellow, light green, brown and other, the most typical identification feature is that there are 4 square black dots on the back of the terminal ventral segment, and the head can be seen after three years of age.
2, hazard characteristics: grassland night moth, also known as autumn armyworm, will appear translucent film "window holes" and irregular long holes when harming plant leaves, and can also eat the entire leaves, which will cause large-scale death of plants when serious. Sometimes a large number of larvae are harmed by cutting roots, cutting off the stems of seedlings and young plants, causing serious losses, and when the population is large, the larvae spread in groups like marching.
3, the law of occurrence: the grassland night moth has a strong reproductive ability, can reproduce several generations a year, and the ability to migrate long distances is strong, can quickly spread from one area to another larger range, the spread speed is fast, coupled with its heavy overeating harm, so it is often difficult to prevent and control.
【4】Key points of chemical control of three major nocturnal moth pests in lawn:
Since the larvae are the main pest stage of the "nocturnal moth" pest, it is necessary to seize the best prevention and control period in the garden maintenance, adhere to the principle of "early treatment, treatment of small, early detection, early prevention and control", and carry out pharmaceutical control in the early stage of larval hatching.
1. At the beginning of the occurrence, it is recommended to use 5% high chlorine and methyl vitamin salt microemulsion (Qilin Royal Moth) 800-1000 times liquid for uniform spray control, in order to avoid drug resistance, it is recommended to use it in rotation with 22% thiamethiasis perchlorofluoride microcapsulant suspension - suspension agent (Qilin Guangzheng).
2. When the larvae are severely affected, the drug resistance of the larvae after 3 years of age is significantly enhanced, combined with the work experience of grass-roots plant protection, it is recommended to use 14% Avi insect mite nitrile suspension agent (Qilin Yindi) 600-800 times liquid uniform spray control, can achieve a good control effect, in order to avoid drug resistance, it is recommended and 16% of Avi indate - suspension agent (Guangcan) rotation.