1, blood-type septicemia:
①Infectious pathway: the pathogen through the food infection, trauma infection and mutual infection of insects in the field and cause silkworm disease. From the infection to the germs to the onset of about 5-7 days, the onset of small silkworms faster, the onset of large silkworms slower, mainly in the 3-4 sleep before and after the big silkworms will be ripe silkworms.
② Symptoms: silkworm body swelling, body color milky white, action wild noise, often in the silkworm seat around and nest side crawling, skin easy to break, crawling through the place left traces of milky pus, after the death of the body of the silkworm rot black, due to the onset of different periods, the performance of the symptoms can be divided into:
Sleepless silkworms: the age of the immediate onset of silkworms, the skin is tense and shiny, not late mulberry, in the seat of silkworms in the wild crawling! Can not sleep, and finally the skin rupture pus and died.
High-jointed silkworms: In the fourth and fifth age of silkworms before and after the feast period, the inter-annular membrane is high, the shape of bamboo joints.
Shrinking Silkworms: The onset of the disease occurs soon after the fifth year of age, when the skin loosens, the intersegmental membrane folds into a ring, the body shrinks, and the silkworm stops eating gradually.
Pus silkworms: 5 years old bloom to ripening period of the onset of the swelling of the whole body, body color milky white.
2, midgut-type pus ion and hollow head softening disease
Midgut-type pus disease and hollow head softening disease are caused by viruses, all batches of silkworms can occur, but the occurrence of the more serious season is the 3rd -6th batch of silkworms, which is the high temperature season.
①Symptoms of midgut pustulosis: silkworms are uneven, different sizes, sleep unevenly, slow development, the sick silkworms are thin, less or no mulberry food, the age of the onset of silkworms was shrinking silkworms; 4-5 age of the onset of two or three days later, the sick silkworm chest slightly transparent, when the disease is serious, not eating leaves, the abdomen is more swollen, the tail atrophic; the silkworms crawling has been the nest side of the Hanging motionless and then to the out of a large amount of gastric fluid and died. A lot of gastric fluid and death.
② empty head softening disease symptoms: the age of the rate of food 1-2 days shrinkage of silkworms, especially the age of the five years of the occurrence of more silkworms, sick silkworms eat less mulberry or not eat mulberry; storage of the age of the full-fledged period of time, especially the age of five years of the occurrence of empty-headed silkworms, the sick silkworms cephalothorax up, chest expanded, the upper half of the body transparent or whole body transparent, eat less mulberry or do not eat mulberry.
3, bacterial disease
Mainly through the pathway of contagion and trauma infection of germs transmitted to the silkworms caused by the disease
①Bacterial gastrointestinal disease: the main symptoms are: rates of food, not eat mulberry, the silkworm body wrinkled and thin, the silkworm body of the front part of the alimentary canal mulberry leaves, filled with digestive juices, the appearance of the semi-transparent, the disease of the silkworm discharge dilute feces, also known as the up and shrinkage, the empty head, the disease of dysentery, etc.
2, the disease is not a disease, but a disease of the silkworm.
② black chest and fungal septicemia: an acute disease, generally infected 24 hours of death, after death, the body of the chest expanded black for the black chest septicemia, after death, the body of the brown spots, the whole body softened reddish-brown, the skin are broken, outflow of red stinking water and other symptoms of fungal septicemia.
3. Ixoderma: It is mainly transmitted through the food and caused by the development of silkworms, divided into acute and chronic two kinds of food, a large number of germs, it is an acute attack, the infection of half an hour after the stopping of the industry to eat the leaves of the first half of the body stiff, thorax, tail shriveling and emptiness, mild infection is slower to develop, the death of the 2-3 days after the succession of deaths.
4, rigor mortis
Rigor mortis is caused by fungal parasites in the silkworm body caused by sericulture, due to the death of the silkworm does not rot, the body hardened, so also known as sclerosis. The morbidity environment is mainly humid environment, such as high temperature and humidity, the onset of fast, low temperature and humidity, the onset of a little slower.
5, multi-chemical fly chewing disease
Symptoms: big flies lay eggs on the skin of silkworms, after 36-48 hours of hatching into young maggots drilled into the body of silkworms, leaving white eggshells on the skin of silkworms, eggshells fall off after the emergence of obvious black spots. With the growth of maggots, black spots expand into a funnel-shaped, about 4-5 days later, the silkworm died, such as five-year-old silkworms are parasitized, there is a tendency to early maturity, ripe silkworms after cocooning, but cocooning 2-3 days after the fly through the cocoon and out of the cocoon to become through the head of the cocoon, the cocoon that is, the cocoon under the cocoon.
6. Poisoning
①Touch-kill type pesticide poisoning
Symptoms: acute tail, chest up, spitting water, s-shaped trembling.
②Intake pesticide poisoning symptoms: silkworms do not vomit water after poisoning, not trembling, chest expansion, after death into a shape, the body is soft.
③ gas poisoning symptoms: mainly due to the environmental content of sulfur, sulfur dioxide and accumulated in the mulberry leaves, silkworms through the ingestion of infection caused by gas poisoning of silkworms to cash out, body nodes swollen, easy to break the skin and died of injuries.
4 fertilizer poisoning: mainly mulberry garden fertilizer is not enough interval after a certain period of time on the mulberry leaves to feed the leaves and caused by poisoning, silkworms are also poisoned by spitting water, trembling phenomenon.