DEVELOPMENT OF TOBACCO CATERPILLAR, Spodoptera litura (FABRICIUS) (LEPIDOPTERA: NOCTUIDAE) ON DIFFERENT CULTIVARS OF CABBAGE
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Date
2012
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PAU Ludhiana
Abstract
The development of tobacco caterpillar, Spodoptera litura (Fabricius) (Lepidoptera:
Noctuidae) was studied during 2012-13 on cabbage cultivars viz. Pride of India, Pusa Drum
Head, KGMR-1, Golden Acre and Pusa Mukta at the Entomological Laboratory, PAU,
Ludhiana. There were significant differences in incubation period and hatchability of eggs
with a minimum incubation period on Pusa Mukta (4.27 ± 0.09 days) and maximum on Pride
of India (4.87 ± 0.10 days). Egg hatchability was maximum on Pusa Mukta (86.66 ± 0.82%)
and minimum on Pride of India (81.76 ± 1.06%). There were significant differences in
duration of larval instars on different cultivars. Total larval duration was minimum on Pusa
Mukta (15.55 ± 0.12 days) and maximum on Pride of India (20.09 ± 0.14 days). The larval
survival was minimum on Pride of India (71.00 ± 1.29%) and maximum on Pusa Mukta
(89.00 ±1.29%). Pre-pupal and pupal periods were observed as minimum on Pusa Mukta
(2.26 ± 0.02 and 6.38 ± 0.03 days, respectively) and maximum (2.89 ± 0.10 and 9.08 ± 0.05
days, respectively) on Pride of India. The male and female pupal weight was maximum on
Pusa Mukta (0.362 ± 0.003g and 0.364 ± 0.004g, respectively) and minimum on Pride of
India (0.349 ± 0.003g and 0.351 ± 0.003g, respectively). Pupal survival was maximum on
Pusa Mukta (92.00 ± 1.83%) and minimum on Pride of India (80.00 ± 2.42%) and Pusa Drum
Head (80.00 ± 2.08%). No significant differences were observed in pre-oviposition,
oviposition, post-oviposition periods; adult longevity and fecundity on all the test cultivars.
The female and male sex ratio ranged from 1.22:1 to 1.86:1 on different test cultivars. The
total life duration of S. litura varied significantly among different cultivars with maximum on
Pride of India (36.93 ± 0.25 days) and minimum on Pusa Mukta (28.46 ± 0.54 days). The
extent of damage in terms of leaf area consumed/ larva was maximum on Pusa Mukta (158.28
± 0.89 cm²) and minimum on Pride of India (139.82 ± 0.69 cm²). The Consumption Index
(CI), Approximate Digestibility (AD), Relative Growth Rate (RGR) and Efficiency of
Conversion of Ingested food (ECI) were found to be maximum on Pusa Mukta (2.20 ± 0.04,
88.10 ± 1.04%, 0.20 ± 0.01 and 9.18 ± 0.37%, respectively). However, Pride of India
recorded minimum CI (1.06 ± 0.02) and AD (76.10 ± 1.74%) with comparatively lower RGR
(0.09 ± 0.01) and ECI (8.28 ± 0.33%), and thus proved least suitable for the development of
S. litura.
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