STUDIES ON BIOECOLOGY AND LIFE FERTILITY TABLES OF TOBACCO CATERPILLAR, Spodoptera litura Fab. (Lepidoptera: Noctuidae) ON DIFFERENT HOST PLANTS
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Date
2019-07
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation on “Studies on bioecology and life fertility tables of tobacco
caterpillar, Spodoptera litura (Fab.) (Lepidoptera: Noctuidae) on different host plants” was
carried out during 2016-2017 in the Department of Entomology, Dr. Yashwant Singh Parmar
University of Horticulture and Forestry, Nauni, Solan. Three different host plants (castor,
capsicum and tomato) were selected to study the bioecology and life fertility tables of the
tobacco caterpillar at different constant temperatures (20, 25, 30 and 35°C) under laboratory
condition. The incubation period was maximum on capsicum and tomato (7 days each) at
20°C, whereas it was minimum (1 day) on castor at 35°C. The larval, pupal and total
development periods were maximum (26.05, 18.71 and 51.76 days, respectively) on
capsicum at 20°C and minimum (7.18, 3.84 and 12.02 days, respectively) on castor at 35°C.
The male and female longevity was maximum (17.42 and 18.8 days, respectively) on castor
at 20°C and minimum (5.2 and 6.2 days, respectively) on capsicum at 35°C. Fecundity was
highest (1754 eggs per female) on castor at 25°C and lowest (450 eggs per female) on
capsicum at 35°C. Temperature and host had a significant effect on the duration of different
stages and fecundity of S.litura, whereas interaction of host and temperature had a significant
effect only on larval and pupal period and longevity of male and female. Life fertility tables
were also constructed on castor, capsicum and tomato at all four constant temperatures (20,
25, 30 and 35°C). The highest value of the true intrinsic rate of natural increase (rm) was
observed on castor (0.4632 females per female per day) at 35°C and was lowest (0.1008
females per female per day) on capsicum at 20°C. Overall studies thus revealed that castor is
the most favourable host ofS.litura.
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