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Juvenile hormone (JH) analogues and mimics regardless of synthetic or of plant/animal origin are potent pest control agents and are popularly referred to as ‘third generation pest control agents’. w-formyl longifolene oxime propargyl ether (NL13), an oxime ether of carbonyl compounds derived from longifolene, a tricyclin sesquiterpene from Indian turpentine oil extracted from the chir pine, Pinus longifolia (Roxb., Pinaceae) and bakuchiol, isolated from the medicinal weed, Psoralea coryllifolia (Linnaues) (Papilionaceae) are proven biopesticides against Culex quinquefasciatus and Dysdercus Koenigi, respectively. These two compounds show JH mimicking activities and disrupt the regular developmental pattern and thus identified as potential biopesticides. Since the larvae of silkworm Bombyx mori L. are known to respond positively to administration of exogenous JH analogues and mimics in terms of enhanced silk production, minute quantities of these two compounds were administered to fifth instar larvae based on the results of previous broad spectrum dose response studies. Emulsions containing 2.5, 5 and 10 ppm of NL13 and 0.625, 1.25 and 2.5 ppm of bakuchiol were administered to the fifth instar larvae of bivoltine silkworm hybrid, KA x NB4 D2 at 24, 48, 72 and 96 h at the rate of 12.5 ml/100 larvae, 30 minutes prior to feeding at about 10 am. The compounds elicited notable positive response in silkworm in terms of improved economic traits such as larval and cocoon characters. In the case of NL13, 5 ppm and in the case of bakuchiol, 1.25 ppm of the compounds at 48 h of 5th instar showed the maximum improvement in the cocoon traits in the range of 10~15%. The physiological impact of the compounds on silkworm growth and development and the resultant impact on the commercial traits are discussed.
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