The effects of high humidity and temperature on the economic characters of the silkworm, Bombyx mori L.
2000
Wali-ur-Rehman (Pakistan Forest Inst., Peshawar (Pakistan)) | Ashiq, M.N. | Siraj-ud-Din
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 Centigrade 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 Centigrade 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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