alexa Abstract | Life Cycle of Spotted Pod Borer, Maruca Vitrata (Fabricius) (Crambidae, Lepidoptera) on Greengram under Laboratory Conditions

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A study on biology of spotted pod borer, Maruca vitrata was studied on greengram under laboratory conditions during rabi 2014-2015 at the Regional Agricultural Research Station, Lam, Guntur. The female moth laid eggs on the flower buds, flower petals, tender pods and on inner surface of glass jar. The egg period lasted for 3.25 days. Mean fecundity was 52.16 eggs. There were five larval instars with mean larval duration of 14.85 days. The measurements (length x breadth) of first, second, third, fourth and fifth instar larvae were 3.02 mm x 0.61 mm, 4.43 mm x 0.87 mm, 8.80 mm x 1.69 mm, 11.10 mm x 2.68 mm and 15.68 mm x 3.07 mm, respectively. The average head capsule width of first, second, third, fourth and fifth instar larvae were 26.80 μm, 65.20 μm, 88.70 μm, 121.60 μm and 139.60 μm, respectively. The fully grown larvae stopped their feeding and spun silken thread around it to transform into pupa on dry leaves, flowers and debris. The pre pupal and pupal period lasted for 1.85 and 7.35 days respectively. The longevity of male and female moths was 5.80 and 7.95 days respectively. The total developmental period of M. vitrata ranged from 32.95 to 35.10 days with 76.00% of adult emergence.

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Author(s): D Sravani* and M Sesha Mahalakshmi


Biology, spotted pod borer, Maruca vitrata, greengram, Plant Sciences and Environmental Sciences

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