Journal of Biological Control

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Relationship Between the Host Age and the Fitness Components of Hyposoter didymator Thunb. (Hymenoptera: Ichneumonidae)


Affiliations
1 Division of Entomology & Nematology, Indian Institute of Horticultural Research, Bangalore - 560089, India
 

Hyposoter didymalor Thunb. was found to parasitise 0-6 day old Spodoptera litura (F.) larvae in the laboratory at 24.5 ± 1 °C and 65 per cent RH. Effect of host age on developmental period of immature stages, sex ratio of adults, size of the progeny and degree of succcssful parasitism (survivorship) of the parasitoid were investigated. There was a significant negative correlation between the host age and the parasitoid developmental period, while the size of the progeny was observed to increase with the age of the host. Maximum parasitism was observed in 5-day-old host larvae.

Keywords

Hyposoter didymator, Hostage, Developmental Period, Sex Ratio, Size of the Progeny, Degree of Parasitism, Spodoptera litura.
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  • Relationship Between the Host Age and the Fitness Components of Hyposoter didymator Thunb. (Hymenoptera: Ichneumonidae)

Abstract Views: 210  |  PDF Views: 122

Authors

Pradyumn Kumar
Division of Entomology & Nematology, Indian Institute of Horticultural Research, Bangalore - 560089, India
S. P. Singh
Division of Entomology & Nematology, Indian Institute of Horticultural Research, Bangalore - 560089, India
Chandish
Division of Entomology & Nematology, Indian Institute of Horticultural Research, Bangalore - 560089, India
R. Ballal
Division of Entomology & Nematology, Indian Institute of Horticultural Research, Bangalore - 560089, India
S. K. Jalali
Division of Entomology & Nematology, Indian Institute of Horticultural Research, Bangalore - 560089, India

Abstract


Hyposoter didymalor Thunb. was found to parasitise 0-6 day old Spodoptera litura (F.) larvae in the laboratory at 24.5 ± 1 °C and 65 per cent RH. Effect of host age on developmental period of immature stages, sex ratio of adults, size of the progeny and degree of succcssful parasitism (survivorship) of the parasitoid were investigated. There was a significant negative correlation between the host age and the parasitoid developmental period, while the size of the progeny was observed to increase with the age of the host. Maximum parasitism was observed in 5-day-old host larvae.

Keywords


Hyposoter didymator, Hostage, Developmental Period, Sex Ratio, Size of the Progeny, Degree of Parasitism, Spodoptera litura.