how to treat such a black and long bug in the corn field? How long is his growing period?

this is the armyworm. The armyworm, also known as the night thief, belongs to Lepidoptera and Noctuidae. Also known as millet night thieves, marching insects and so on. Larvae feed on leaves, such as wheat, rice, millet, corn, cotton, beans, vegetables and more than 1 kinds of plants in 16 families can be regarded as the food of armyworm. According to the age of armyworm, the first instar larvae of armyworm can only eat common mesophyll, which makes the leaves appear white spots. After the 3rd instar, they can nibble at the leaves and become a big gap. When the 5th-6th instar larvae enter the gluttony stage, they can eat corn bare or eat the whole corn seedling. The first instar larvae are gregarious. After the 3rd instar, the armyworm will pretend to be dead. After being frightened, it will quickly curl up into a ball and fall to the ground, and it is afraid of light. Climbing on plants in the evening or cloudy days is harmful, especially the second generation of armyworm, which has the characteristics of gregarious, omnivorous, migratory and explosive, and often suddenly breaks out in regional areas, and when it is serious, it will eat up the leaves and form a polished rod, resulting in serious yield reduction or even no harvest.

1. 4.5% beta-cypermethrin EC can be sprayed with 3-6ml per mu for control.

2. 4% chlorpyrifos EC can be sprayed with 5-1ml per mu for control.

3. 2% fenpropathrin is sprayed with 5-1ml per mu.

4, 5% emamectin benzoate 2 grams per mu spray control.

generally, a generation takes about 45 days. How to treat the long and black worms that have risen in the corn field? How long is the growth period?

corn armyworm

There are many pesticides to be controlled, and the key is to take it early. Young larvae are the key period for control!

The insect is old in the picture, but it can only be prevented by increasing the pesticide concentration.

you can choose: emamectin benzoate+beta-cypermethrin

fluorouracil+beta-cypermethrin

chlorpyrifos+beta-cypermethrin

. . . . . . Choose a formula, mechanical spray!

I wish you success! How to treat

corn armyworm with a long black bug in the corn field? Spraying: imidacloprid 15 times or cypermethrin 1 times or metronidazole 15 times, etc. How long is the growing period of corn

9-13 days, generally about 12 days in spring; Summer broadcast for 9-11 days.

The growing period of maize is the number of days from emergence to maturity. The length of maize growth period is related to varieties, sowing date and temperature. Generally, those with more leaves, early sowing date and low temperature have a long growth period, and vice versa. Sowing in spring for 7~1 days and sowing in summer for 7~85 days is early maturity type; Sowing in spring for more than 12~15 days and sowing in summer for more than 96 days are late-maturing types; The varieties in between are medium-mature varieties. How many days is the growing period of corn

About 1 days in North China and 13 days in Northeast China.

The main planting systems in China are as follows:

1. Northeast China, northern North China and parts of northwest China are spring corn areas with one crop per year;

2. The North China Plain is dominated by summer maize with double cropping a year;

3. The hilly and mountainous areas in the southwest and south are complex in topography, with spring corn harvested once a year in alpine mountainous areas, summer corn harvested twice a year in hilly mountainous areas, and autumn corn harvested three times a year in plain and shallow mountainous areas.

4. Cultivation methods include monoculture, intercropping with beans and potatoes, and interplanting with wheat ridges. Early sowing at suitable time is very important to increase its yield. According to the conditions of fertilizer and water and the characteristics of varieties, reasonable close planting and sufficient number of seedlings and ears are the key to high yield.

5. Maize needs more nitrogen and potassium, but less phosphorus, and can use the residual phosphorus from the previous crop. However, when the available phosphorus in soil is less than 1ppm, the yield is significantly increased by phosphorus application. It is sensitive to zinc fertilizer and its growth is inhibited when zinc is lacking. The total water requirement for growth is 56 ~ 61mm/ha. The water demand at seedling stage is less, the jointing and booting stage is increased, the tasseling and flowering stage is the most, and the filling maturity stage is more.

6. Corn is not tolerant to waterlogging, and drainage should be paid attention to in rainy areas. The ear leaves turn yellow, the black layer is formed at the base, and the seeds are harvested when they become hard.

expansion:

1. Seedling fertilizer: generally, it should be applied topdressing after seedling establishment to jointing stage (leaf age index is about 3%). That is to say, the former seedling-lifting fertilizer and jointing fertilizer are applied at one time, which has the functions of promoting roots, strengthening seedlings, promoting leaves and strengthening culms, laying a good foundation for more panicles and larger panicles. Besides the quick-acting nitrogen fertilizer, the seedling fertilizer can also be applied with phosphorus fertilizer and potassium fertilizer at the same time, or with decomposed organic fertilizer.

2. jointing fertilizer: jointing fertilizer can promote the growth of middle and upper leaves, increase the photosynthetic area and prolong the photosynthesis of lower leaves, laying a good foundation for promoting roots, strengthening culms and increasing ears. Topdressing jointing fertilizer is mainly nitrogen fertilizer, and 1~15 kilograms of urea can be applied in ditches or holes per mu to avoid topdressing before heavy rain to prevent it from being leached by rain. For the fields with insufficient phosphorus and potassium fertilizer in the soil, three-element compound fertilizer can also be added when topdressing, with 7.5~1 kg per mu.

3. Ear fertilizer: topdressing the ear fertilizer at the big bell mouth stage can not only meet the nutrient demand of ear differentiation, but also improve the photosynthetic productivity of middle and upper leaves, so that more nutrients are transported into the ear, and more grains are full. The topdressing of ear fertilizer is mainly available nitrogen fertilizer, and it is appropriate to topdressing urea 15 ~ 2kg per mu.

4. Granular fertilizer: Granular fertilizer refers to the fertilizer applied topdressing after heading of maize, and it is generally appropriate to apply topdressing at the filling stage. After heading to maturity, corn still absorbs about 4% of the total nitrogen and phosphorus from the soil. At the same time, about 8% of grain yield depends on the late leaves to make photosynthetic yield. Therefore, a certain amount of quick-acting chemical fertilizer should be applied in the later stage to ensure the adequate supply of inorganic nutrients, prolong the functional period of leaves, improve photosynthetic efficiency, increase the accumulation of photosynthetic products, and promote the number and weight of grains in order to obtain high quality and high yield. How long is the growth period of geese?

It takes 72 to 8 days for commercial geese to go out, that is, to see if there is dried blood on the feathers of goose wings .. How long is the growth period of rabbits?

(1) Division of growth and development stages

According to the characteristics of growth and development of rabbits, the whole period from birth to aging and death of rabbits is divided into five stages.

1. Rabbit period (lactation period): indicates the period from birth to weaning. Generally 28 ~ 35 ~ 42 days.

1. Young rabbit period: refers to the period from weaning day to 3 months old.

3. Middle rabbit period (also called young rabbit, reserve rabbit and adult rabbit): refers to the period from the age of 3 months to the first mating. Once mated, it is considered adulthood.

4. adulthood: refers to the period from the first match to the age of 3.

⒌ old age: refers to the period over three years old. The life span of rabbits is generally 5~9 years old, and the highest is 12 years old.

(2). Age identification

1. Look at the claws. White rabbits can be judged according to the length of the red and white parts of the foot melon. Red is longer than white within 1 year old: red is similar to white around 1 year old; The red color over 1 year old is shorter than the white color. The longer the white color is, the yellower it is, the thicker it bends and the hook is, indicating the older it is. The paws of colored young rabbits are short and straight, and hidden in the foot hair; Old rabbits are exposed outside the foot hair, and the claws are hooked.

1. Look at the front teeth. The front teeth within one year old are short, flat, white and neat; The front teeth of aged rabbits are yellow and dark, thick and large, sparse, irregularly arranged, and some are defective.

(3) Look at the ear tag. The ear tag has the date of birth and the variety mark. Eartags should be put on the breeding farm. If the individual number is 7525HA1, the first 6 digits are year, month and day. It means that the rabbit was born on May 25th, 27. HA is the breed code of Harbin white rabbit. 1 is the first nest born by a rabbit that day. Other analogies are as follows: 7525HA2. For the second one on the 25th. According to the age of the date of birth on the ear tag, it can be judged most accurately. How long is the growth period of cicadas

The life cycle of cicadas is 1 year, 4 years, 12 years, 13 years, 17 years, and so on, which is different due to different regions and species. For example, the cicadas in North America are 17 years old, while those in South America are 13 years old. I'm afraid the reason is to avoid mutual annexation and fighting among populations. How many days is the growing period of 65 maize seeds?

denghai 65 maize variety:

This variety meets the national maize variety approval standard and has passed the approval. It is suitable for summer sowing in Shandong, Henan, central and southern Hebei, northern Anhui and Yuncheng, Shanxi, and suitable areas in Inner Mongolia Autonomous Region, Shaanxi Province and Zhejiang Province. Pay attention to the prevention and control of smut, brown spot and southern rust, and use it with caution.

Variety characteristics:

It takes 11 days from emergence to maturity in Huanghuaihai area, one day later than Zhengdan958, and the effective accumulated temperature is about 255℃. The leaf sheath of seedlings is purple, the leaves are green, the leaf margin is green with purple, the anthers are yellow-green, and the glume is light purple. The plant type is compact, the plant height is 259 cm, the ear position is 99 cm, and the number of adult leaves is 19 ~ 2. Filaments are light purple, the ear is long and cylindrical, the ear length is 18 cm, the number of rows per ear is 16 ~ 18, the ear axis is red, the grain is yellow and horse-toothed, and the weight of 1 grains is 34.4 grams.

after inoculation and identification by hebei academy of agriculture and forestry Institute of Plant Protection, it is highly resistant to stem rot, moderately resistant to corn borer, susceptible to big leaf spot, small leaf spot, dwarf mosaic and Curvularia leaf spot, highly susceptible to smut, brown spot and southern rust.

as determined by the Grain Quality Supervision, Inspection and Testing Center (Beijing) of the Ministry of Agriculture, the grain bulk density is 766g/L, with crude protein content of 9.35%, crude fat content of 3.76%, crude starch content of 73.4% and lysine content of .31%.

In 28-29, we participated in the regional test of summer maize varieties in Huanghuaihai, and the average yield per mu in two years was 659. kg, which was 5.3% higher than that of the control Zhengdan 958. In the production test in 29, the average yield per mu was 614.9 kg, which was 5.5% higher than that of the control Zhengdan 958.

yield performance:

regional test performance in Inner Mongolia Autonomous Region: in 28, the pre-test of middle-late maturity group increased yield by 6 points, with an average yield of 859.2kg per mu, which was 6.3% higher than that of the control Zhengdan 958; In 29, the 6-point regional test of late-maturing group all increased the yield, with an average yield of 911.3kg per mu, which was 6.2% higher than that of the control Zhengdan 958. In 21, the yield of the late-maturing group was increased at 6 o'clock, with an average yield of 93.5kg per mu, which was 9.8% higher than that of the control Zhengdan 958, ranking first. This variety has good adaptability and stable yield. There is no obvious disease in the field.

in 28, the governor of Shandong province directed the field to tackle key problems, with an average yield of 128.61kg per mu in 15 mu. In 29, an inspection team composed of national experts in maize breeding and cultivation conducted strict production inspection on the high-yield field (8 mu) of denghai 65, a new super maize variety, with an average yield of 1,41.82 kg per mu. The yield per mu of two high-yield established fields in denghai 65 all exceeded 1 kg, and the average yield per mu of two 1-mu demonstration fields reached 874.7 kg. In 21, the grain king competition in Shandong Province produced 98 kilograms per mu.

cultivation emphasis:

in plots with medium fertility or above, the suitable density is 4, ~ 4,5 plants per mu. Pay attention to the prevention and control of smut, brown spot and southern rust, and use it with caution.