AN ASSIGNMENT ON DISEASES OF SILKWORM.pptx

Diseases of silk worm

1. An Assignment on Diseases of Silkworms and their management

2. Submitted to- Dr.Swatilekha Mohanta ( Asst.Professor Nematology) Submitted by – Subhrajyoti Mohanty Admission –No.-201810028 Course–No.-ENT-324(HO) Course–Title- Apiculture, Sericulture and Lac culture

3. Diseases

4. 1. Grasserie Disease : ▶ Viral disease of silkworm ▶ Causative agent- Bombyx mori Nuclear polyhedrosis virus. ▶ Occurence – Throughout year , most in Summer and rainy season ▶ Epidemiology( source of infection)- . Milky white fluid released by grasserie larvae contaminate mulberry leaves ,silkworm feeding on contaminated mulberry leaves gets infected.

5. ▶ SYMPTOM S - 1. Skin of larvae becomes shiny before moult . 2. Intersegmental swelling , yellowish body . 3. Turbid white haemolymph oozes out of larva . 4.Larva stops feeding and moving and turns black

6. Intersegmental swelling Turbid white haemolymph oozes out Stop moving and turns black

7. Chemical control: . Disinfection of rearing house and equipments with 0.05% Asthra solution,2.5% sanitech , 0.5% ,2% formalin or 2% bleaching powder with 0.3% slaked lime.

8. 2.FLACHERIE DISEASE: ▶ Causative agent- Bombyx mori Densonucleosis virus. ▶ Occurence- summer and rainy season EPIDEMIOLOGY (mode of infection): silkworm gets infected by eating contaminated mulberry leaves. Dead diseased silkworm’s faecal matter ,gut juice,etc .

9. SYMPTOMS: Larvae becomes soft and flaccid. The growth of infected larvae retarted . Larval head and thorax becomes translucent.( blackness of thorax )

10. Management Sun drying of rearing appliances for one/two days 2.Disinfection of rearing room and appliances with 5% bleaching powder 3.Disinfection of worms, trays and discarding of diseased worm 4.Collect and burn infected larvae, faecal matter and bed refuses 5.Dust the bed disinfectant, Vijetha (or) Resham Keet Oushadh on the larvae, after   each  moult and ½ hr. before resumption of feeding (3 kg/100 dfl ).

11. 3.MUSCARDI NE DISEASE: ▶ Causative agent- Beauveria bassiana ( white muscardine fungus) Spicaria prasina ( Green muscardine fungus) Iscaria farinose ( Yellow muscardine fungus) ▶ Occurrence- Rainy and Winter season . EPIDEMIOLOGY(Mode of infection): Conidia(spores) come in contact with silkworms body Mummified sikkworm, lepidopteran hosts, contaminated rearing house and appliances.

12. SYMPTOMS: Loss of larval appetite . Moist specks on larval skin. Larval vomiting. After death larva grow aerial mycelia around itself and gets chalky white ( mummified).

13. ▶ INFLUENC E OF INFECTIO N OF Be a uveria bassia n a - Preventive measures: Avoid low temperature and high humidity. Dust slaked lime powdee in rearing bed .

14. 4.PEBRINE DISEASE : (PROTOZOAN DISEASE) ▶ Causative agent - - Nosema bombycis / d ifferent strains of ▶ It is non seasonal. ▶ EPIDEMIOLOGY: . Silkworm gets infected through eggs( Transovarium transmission). Infected silkworm are source of infecti on.

15. SYMPTOMS: Irregular hatching of silkworm’s egg. Irregular size of larval body. Loss of larval appetite. White postules appear on silkgland .

16. In the advanced stage of the disease, there are irregular black spots as pepper grains on the body of the larvae. So the disease is named as pebrine .

17. Prevention and control : Production and supply of disease free layings Surface sterilization of disease free layings by dipping the egg cards in 2% formalin and washing in running water. Maintenance of strict sanitation, hygienic rearing. Destruction of diseased material. Disinfection of rearing rooms and appliances

18. References https://agritech.tnau.ac.in/sericulture/disese%20mgt_silkworm.html https://en.m.wikipedia.org/wiki/Bombyx_mori#:~:text=at%20all%3A%20tyrosine-,Silkworm%20diseases,survive%20to%20the%20moth%20stage.

19. THANK YOU