The effects of high humidity and temperature on the economic characters of the silkworm, Bambyx mori L.
The effects of high humidity and temperature on the economic characters of the silkworm, Bambyx mori L.
Wali-ur-Rehman, Meher Nigar Ashiq and Siraj-ud-Din
ABSTRACT
The effects of high humidity and temperature on the economic characters in the 5th instar larvae of Chinese (C-102) and Japanese (J-101) varieties of the silkworm, Bombyx mori L. were investigated. The mean high humidity of 94% with the prevailing temperature of 23°C increased the larval weight by 11% each, cocoon weight by 20 and 13%, shell weight by 17 and 10%, fecundity by 8 and 11% and decreased larval mortality by 60 and 14% and pupal mortality by 16 and 62% for C-102 and J-101 respectively. The mean high temperature of 30°C with the prevailing humidity of 58% decreased the larval weight by 13, cocoon weight by 18, shell weight by 24 and fecundity by 48% in case of C-102 while in J-101 the same characters were decreased, respectively, by 19, 29, 28 and 42%. This treatment caused high larval and pupal mortality of 82 and 25% in C-102 and 89 and 53% in J-101. However, C-102 proved to be better than J-101 in both the treatments.
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March 2000
Vol. 50, Iss. 1
