Effect of Methoprene on larval and cocoon weight, ovariole length, egg number and fecundity of Bombyx mori L

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Published: Jan 8, 1990
DOI: https://doi.org/10.12681/eh.13979
Keywords:
Bombyx mori Silkworm Methoprene
S.B. Magadum
Cenlral Sericullural Research and Training Institute. Mysore-570008, India.
Μ.Α. Hooli
Department of Zoology, Karnatak University, Dharwad-580 003. Kamatak, India
V.B. Magdum
Department of Zoology, Karnatak University, Dharwad-580 003. Kamatak, India
Abstract
The effect of Methoprene on larval and cocoon weight, ovariole length, egg number and fecundity of BombYx mori (Polyvoltine Pure Mysore breed) was stu­died. Methoprene at 2.75,4.0 and 8.0 pg!ml dilutions was topically applied/sprayed on silkworm larvae repeatedly at 36h in 3rd, 4th and 5th stadium, at 48h in 4th and 5th stadium and singly at 72h in 5th stadium. Of the various dosages used, the repeated applications of 2.75 pg/ml at 36h in 3rd, 4th and 5th stadium of silkworm larvae resulted in significant increase in larval weight, cocoon weight, ovariole length, ovariole egg number and fecundity when compared to untreated controls.
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