EFFICACY OF 2% BLEACHING POWDER IN CONTROLLING SECONDARY CONTAMINATION OF PEBRINE DISEASE INTASAR SILKWORM ANTHEREAE MYLITTA DRURY (DABA T.V)

Abstract

Pebrinedisease found to be highly virulent and harm the larval and cocoon characters of
tropical tasar silkworm Antheraeamylitta Drury (Daba TV).Therefore an attempt has
been made to evaluate the effect of 2% bleaching powder solution in controlling the
pebrine disease attained through secondary contamination by studying larval and
cocoon characters. In comparison with the healthy control (T1 batch larvae reared on
untreated plantation),the results reveal a significant decrease in larval
span,larvalweight,number of cocoons harvested, effective rate of
rearing,cocoonweight,shellweight,shellratio,filament length, reelability, weight of
silkreeled, length of shell, width of shell, shell thickness, peduncle thickness, peduncle
length, peduncle weight, peduncle diameter in T2 batch (infected larvae reared on
untreated Terminaliaarjuna plants) but a slight decrease was observed in T3 batch
(healthy and infected larvae reared combined on 2% bleaching powder solution treated
plantation).The results also show that maximum mortality in T1 batch and T3 batch
larvae was due to viral and bacterial infections and other factors rather than pebrine
disease whereas in case of T2 batch nearly 50% of larval mortality was due to
pebrinedisease.Based on the results obtained from present study 2% bleaching powder
solution is found efficient in controlling pebrine disease attained through secondary
contamination in Daba TV.