What are the characteristics of silkworm eggs in Guangdong and Guangxi?

1) original species traits. 932. Hibiscus: China line, hermaphrodite, hybrid seed that has been dormant for four times in summer and autumn. Eggs are brown-green, eggshells are white, ants are dark brown, and they hatch evenly. Young silkworms are phototactic, strong, active and easy to feed. Strong silkworms are bluish-white, thick and even, with plain spots, eat a lot and sleep together at all ages. The cocoon is oval in shape, white in color, moderately wrinkled and firm in cocoon layer. Male moths have better mating performance, and single moths lay more eggs. The property is flat. There are few bad eggs, but some seeds are born. 7532 Xianghui: Japanese strain, bisexual hybrid seed, dormant for four times in summer and autumn. Eggs are purple-brown, eggshells are yellow, ants are brown, easy to escape and hatch evenly. All ages are well developed, and the strong silkworms are white and pure, but there is no obvious pale moon spot, and their physique is strong. Mature silkworms flock together. Cocoon camp is very fast. Cocoon-shaped long oval shallow bundle, white cocoon color, moderate contraction. Moths are evenly distributed, with good mating performance, large egg production and good adhesion. This variety should be crossed with 932 hibiscus, 2 days earlier in spring and 1 day in autumn.

(2) Hybrid traits. 932 Furong× 7532 Xianghui is a four-element hybrid of China, China × Japan and Japan. The eggs of orthogonal species are brownish green with white shells; The eggs of backcross seeds are purplish brown, and the shells are yellow and white. Ant silkworm is dark brown, hatches evenly, is strong and has good adaptability to leaf quality. Sleeping together at all ages, strong silkworms are blue and white, and backcross is flat silkworms. Silkworms are strong and eat mulberry vigorously. The adult silkworms are neat, the cocoon breeding speed is fast, the cocoon shape is long and oval, the cocoon shape is large, the cocoon color is white, the shrinkage rate is moderate and the silk quality is good.

(3) Feeding points. The photosensitive time of collecting ants should not be too early, and the time of collecting ants should be advanced. Young silkworms should mature with leaves, and pay attention to fresh satiety when eating mulberries, and even expand their seats in advance. During the 5th instar and reeling, ventilation should be strengthened, and reeling preparations should be made in time. Mature silkworms should be warm and refined, and the reeling density should be thin to reduce the occurrence of heavy cocoons.

The content of this paper comes from "China Biotechnology Development Report" published by China Agricultural Publishing House.