Causative organisms: Different fungi cause this disease but the name varies according to the colour of conidiospores, produced by them on the body of worms. Again, by advanced immune enzymatic methods, presence of pebrine spores can be detected quickly. For preparing disinfected rearing beds, 0.4% formalinised husk can be used for the beds of I and II instars; 0.5% for II and III instars, 0.6% for IV and 0.8% for V instar. • Secondary defense is provided by the haemolymph through cellular and humoral responses. (1) To control this disease, the attacked larvae should be removed. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU.

Pebrine Disease in silkworms Pebrine Disease is a serious of silkworm caused by a protozoan parasite. Litter from the infected bed should be removed immediately after detection of infection and be dumped in deep pits and burnt. All rearing appliances including the rearing room then should be disinfected with 4-5% formalin solution or by spreading bleaching powder, (iii) Adult moths showing symptoms of pebrine should not be undertaken for any sericultural processes. 4~5 4~6ds subacute. As a specific measure, 1-2% of Dithane M45 in slaked lime or captaf in Kaolin is dusted on silkworm body.

In sericulture, silkworm can be attacked by various bacteria resulting in different diseases. Different fungi cause this disease but the name varies according to the colour of conidiospores, produced by them on the body of worms.

If infection is primary, more than 50% larvae die before 3rd moult and rarely any larva goes for spinning. For midgut viral infection, the worms show initially no symptoms. (i) In grainages only disease- free layings (DFLs) will be allowed for rearing. This bacterial disease is also known as Rangi in India because of the colours shown by dead larvae. 3.37b), Above men­tioned symptoms help to detect about flacherie – infected larvae. After the formation of cocoons, they are to be kept at a certain temperature This will kill the pupae. (iv) For disinfection of rearing accessories, other agents like Benomyl.

(i) Good sanitation, specially cleaning the room with hot water to inactivate the toxin, (ii) Removal of dead / infected larvae from rearing tray, (iii) Bacterial spores if detected can be destroyed by exposing to 2% formaldehyde for 3 hours or to 100°C for 5 minutes. Fungal diseases of silkworm are called muscardine where the body of larvae gets mummified due to deposition of calcium oxalate and hence the disease is also called ‘calcino’. 3. Labex, a mixture of lime and bleaching powder has anti-muscardine and grasserie effects and can improve larval growth and commercial characters as well. Reproductive conidiophores with characteristic colour then grow from the mycelia. Treatment: (1) To control this disease, the attacked larvae should be removed. 2. Fungal diseases of silkworm are called muscardine where the body of larvae gets mummified due to deposition of calcium oxalate and hence the disease is also called ‘calcino’. All types of muscardine infections are transmitted through skin. This removes the sticky substances from the cocoon and helps in easy reeling of the fibers from the cocoon.iii.

In type II response, other lepidopteran larvae only show rapid inhibition of feeding.

Septicemia mainly caused by Bacillus, Streptococcus and Staphylococcus. ... • The primary defense of silkworm against pathogens is the prevention of infection via possible structural barriers like the integument , peritropic membrane and midgut. (iii) the ante­rior part of the alimentary canal appears transparent due to absence of any mulberry leaves and hence given the name of “Clear Head” to this disease.