BIOLOGY AND MANAGEMENT OF MUSTARD SAWFLY, ATHALIA LUGENS PROXIMA (KLUG) ON MUSTARD CROP
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Date
2000
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The investigation on the "Biology and management of mustard sawfly, Athalia lugens proxima (Klug) on mustard crop" was conducted during Rabi 1998-99 at RARS, R.S.Pura, SKUAST, Jammu. The male and female mated soon after emergence. The female started laying eggs within 3-6 hours after first mating. Eggs were laid singly within the leaf tissue close to leaf margin and a single female laid 72.05±26.28 eggs during an oviposition period of 5.50±1.29 days. The larvae passed through 5-6 instars and the 1st, 2nd, 3rd, 4th, 5th and 6th instar occupied a period of 2.41±0.31, 1.52±0.32, 1.88±0.38, 2.06±0.37, 3.05±0.40 and 1.53±0.25 days respectively. The mean incubation, larval, pre-pupal and pupal period were 5.45±0.34, 12.47±0.65, 4.96±0.62 and 7.03±0.55 days respectively. Developmental period from egg to adult emergence varied from 27-32 (29.93±1.21) days. Longevity of adult male and female was 5.75±1.12 and 5.65±1.30 days respectively. The egg measured 0.73±0.06 x 0.48±0.05 mm. The morphometries (length x breadth) of 1st, 2nd, 3rd, 4th, 5th and 6th instar larvae were (2.10±0.42)x(0.42±0.09), (3.59±0.51)x (0.69±0.06),(5.94±0.75)x(1.00±0.10), (8.68±1.52)x(1.43±0.08), (12.37±1.07)x(2.02±0.16) and (13.78±1.12) x(2.43±0.15) mm respectively. After last ecdysis, the full grown larvae stopped feeding. The pre-pupa was reduced in size and entered in the soil for pupation in an earthen pupal cell. The morphometries (length x breadth) of pre-pupae and pupae were (10.92±0.60)x (2.00±0.14) and (6.27±0.51)x(2.81±0.28) mm respectively. Adult males were smaller in size (5.32±0.12x 1.69±0.07 mm) than the females (6.66±0.30x 2.15±0.10mm).
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