EFFECT OF JUVENILE HORMONE MIMIC R394 ON SILKWORM (Bombyx mori L.) GROWTH AND DEVELOPMENT OF SILK GLAND

The effect of a juvenile hormone (JH) mimic R394 (ethyl 9-cyclohexyl-3, 7-dimethy l-2, 4-nonadienoate) applied topically on the abdominal tergum of silkworm (Bombyx mori L.) after the fourth ecdysis has been studied. JH R394 ranging from 1.0, 0.1, 0.01 µl / larva was applied at 48, 72 and 96 hours of V instar larva that was improved the cocoon weight, shell weight and shell ratio etc. The most effective dose observed 0.01 µl / larva, when applied at 48 and 72 hours after resumption of the last moult. It was observed that the development of the silk gland takes place up to a particular period, after that the larval development increases due to the increase of the feeding period without any significant increase in silk and silk ratio.

[1]  O. Yamashita,et al.  Super growth of silkglands in the dauer larvae of the silkworm, Bombyx mori, induced by a juvenile hormone analogue , 1989 .

[2]  F. Sehnal,et al.  Giant cocoon formation in Bombyx mori L., topically treated with juvenile hormone SJ-42-F , 1986 .

[3]  F. Sehnal,et al.  Ecdysteroid titres during larval life and metamorphosis of Galleria mellonella , 1986 .

[4]  M. Kiuchi,et al.  Increase of silk production by repeated treatments with a juvenile hormone analogue , 1985 .

[5]  S. Asano,et al.  Studies on the utilization of methoprene, a synthetic compound with juvenile hormone activity, for the silkworm rearing , 1979 .

[6]  B. Cymborowski,et al.  The role of juvenile hormone during larval-pupal transformation of Spodoptera littoralis: Switchover in the sensitivity of the prothoracic gland to juvenile hormone , 1979 .

[7]  S. Krishnaswami.  New technology of silkworm rearing. III , 1978 .

[8]  K. Mori,et al.  Effect of Novel Analogs of the Juvenile Hormone. : I. Effect of Juvenile Hormone Analogs with Different Alkyl Substituents at C-7 and C-11 on the Silkworm, Bombyx mori L. (Lepidoptera : Bombycidae) , 1974 .

[9]  K. Mori,et al.  Utilization of Synthetic Compounds with Juvenile Hormone Activity for the Silkworm Rearing , 1972 .

[10]  S. Tamura,et al.  Giant Cocoon Formation in the Silkworm, Bombyx mori L., Topically Treated with Methylenedioxyphenyl Derivatives , 1972 .

[11]  S. Tamura,et al.  Increase in Silk Production by the Silkworm, Bombyx morì L., due to Oral Administration of a Juvenile Hormone Analog , 1972 .

[12]  K. Kiguchi,et al.  Increased Accumulation of Silk Protein Accompanying JH-Induced Prolongation of Larval Life in Bombyx mori L.(Lepidoptera : Bombycidae) , 1971 .

[13]  Masatoshi Kobayashi,et al.  Induction of Prolonged Larval Instar by the Juvenile Hormone in Bombyx mori L. : Lepidoptera : Bombycidae , 1971 .