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Authors: Kamboj, Robin
Advisor: Gaur, Ram Karan
Title: Biology and chemical control of castor hairy caterpillar, Euproctis lunata walker (Lepidoptera: Lymantriidae)
Publisher: CCSHAU
Language: en
Type: Thesis
Agrotags: Planting, Genotypes, Sowing, Yields, Developmental stages, Genetics, Soybeans, Biological phenomena, Selection, Phenotypes
Abstract: Field and laboratory studies on biology, population dynamics and insecticide bioefficacy evaluation against castor hairy caterpillar, E. lunata (Lepidoptera: Lymantriidae) were carried out at CCS Haryana Agricultural University, Regional research station, Bawal during 2014-15. Studies on biology of E. lunata showed that eggs of this species were creamish white, round, pear shaped and found in cluster of 85 to 221. The incubation period varied from 5 to 10 days. There were six larval instars and the larval duration varied from 2 to 7, 3 to 11, 3 to 13, 4 to 15, 4 to 17 and 4 to 19 days in different generations. The pupa was light reddish brown, obtect and pupal period varied from 12 to 19 days in different generations. Male moths of E. lunata were smaller (mean 31.02±0.54 mm in wing expense) than female (mean 36.06±0.61 mm in wing expense). The antennae of male moths were bipectinate whereas the female had filiform antennae. There was a slight difference in sex ratio, being in favour of female. The pest completed three generations under laboratory conditions. Apanteles euproctisiphagus Ahmad a hymenopteran parasitoid caused 20 to 40 per cent larval parasitization in different months. Male lived for 4 to 7 days whereas female for 5 to 9 days. The total life span of male ranged from 44 to 124 days, while that of female as 45 to 127 days in different generation. The observations on pest population showed that larval population fluctuated from 1.0 to 9.0 larvae per plant. Three peaks of larval population were recorded during September 20-29, 2014 (9.0 larvae per plant), November 19-28, 2014 (5.2 larvae per plant) and March 19-28, 2015 (3.5 larvae per plant). Larval population showed positive correlation with maximum temperature (0.574) and minimum temperature (0.335) whereas negative correlation with morning (-0.570) and evening (-0.572) relative humidity. Insecticide bioefficacy studies indicated that novaluron 10 EC @ 0.01 per cent proved most effective in controlling E. lunata both under field as well as laboratory conditions. However, cypermethrin 25 EC @ 0.018 per cent gave 75.60 per cent larval mortality with highest benefit cost ratio (1: 21.93).
Issue Date: 2015
Appears in Collections:M. Sc. Dissertations

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