Does anyone know which other country is the main producing area of soybeans, and whether there are bean worms there?

The world's four major soybean producers: China, the United States, Brazil and Argentina.

China's soybeans are mainly distributed in Heilongjiang, Jilin, Liaoning and Inner Mongolia in the northeast (the area and total output account for more than 50% of the country) and Anhui, Henan, Shandong, Jiangsu and Hebei in Huanghuai area (the area and total output account for more than 20% of the country).

The United States is mainly concentrated in the southwest of the Great Lakes region and its surrounding areas (Iowa, Illinois, Minnesota and Indiana account for 44% of the national soybean area and 48% of the output).

Brazil is mainly concentrated in the southwest (the output of Nandahe, Parana, Mato Grosso and Mato Grosso Sul accounts for 80% of the country).

Argentina is mainly concentrated in the provinces of Santa Fe, Có rdoba and Buenos Aires (the output accounts for more than 90% of the country).

In terms of area, in 2004, the United States far surpassed Brazil (214700 hectares), ranking first in the world, while Argentina ranked third with139500 hectares and China ranked fourth with105800 hectares. In recent years, soybean development in China has been lagging behind the United States, Brazil, Argentina and Argentina. After 200 1, Argentina also surpassed China, especially Brazil. Compared with 200 1, the area in 2004 increased by more than 50%.

In terms of yield, due to the application of transgenic technology, the soybean yields of the United States, Brazil and Argentina are basically at the same level, which is much higher than that of China on the whole, and they are arranged on average during the five years from 2000 to 2004. Soybean production in the United States (2584 kg/hm2) >: Brazil (2553kg/hm2) >: Argentina (2532kg/hm2) >: China (1707kg/hm2).

From the perspective of total output, it ranks the same as area and yield. In 2004, the United States (85.74 million tons) >: Brazil (492 1 10,000 tons) > Argentina (32 million tons) > China (17.75 million tons).

In terms of quality, the fat content is Argentina >: Brazil >; The United States > China, protein and China >; America > Brazil >; Argentina.

Pieris rapae, commonly known as the bean moth, is mainly distributed in the Huanghuai River Basin, the Yangtze River Basin and South China, and mainly harms soybeans, mung beans, cowpeas and Robinia pseudoacacia.

Larvae and adult of this moth can be caught in three major soybean producing areas such as China.

Adult activity time is from April to June, 10 month, and there are 1 ~ 2 generations every year. Generally, there are one generation in Huanghuai basin, two generations in Yangtze River basin and South China. The last larvae overwinter in the soil with a depth of 9 ~ 12 cm, and the overwintering places are mostly in the sunny places such as bean fields and nearby mounds and ridges.

Adults lie down during the day, come out at night, live among lush crop stalks during the day and start to move at night. Strong flying ability, able to fly at long distance and high altitude. Have the habit of eating nectar, and have a strong tendency to black light. Most eggs are scattered on the back of bean leaves, and a few are produced on the front of leaves and stems. Each leaf can produce 1 ~ 2 eggs.

Newly hatched larvae are backlit and lurk on the back of leaves during the day. 1 ~ 2 instar larvae generally do not switch to plants, and 3 ~ 4 instar larvae have the habit of switching to plants because of the increase of food intake. In the second generation area, the first generation larvae mainly harm spring-sown soybeans, while the second generation larvae mainly harm summer-sown soybeans.

During pupation and eclosion, if the rainfall is moderate and evenly distributed, it will be serious. If there is too much rain, the occurrence period will be delayed, and the dry weather is not conducive to the occurrence of bean moths. In places with dense plants, low terrain and fertile soil, siltation is more serious. Different soybean varieties suffer from different degrees, especially those with early maturity, soft stems and leaves, high protein content and high fat content. The natural enemies of the bean moth are Trichogramma, parasitic flies, lacewings, ladybugs and so on. It has certain control effect on the occurrence of bean moth.

This kind of insect has now become a special breeding project with considerable profits.