Indian Journal of Entomology
Year : 2008, Volume : 70, Issue : 3
First page : ( 241) Last page : ( 245)
Print ISSN : 0367-8288.

Life table studies of Plutella xylostella linnaeus on cauliflower leaves treated with gibberalic acid and Pseudomonas fluorescens (Migula)

Sundaram A. Mohana, Dhandapani N.

Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore-641 003.

Received:  May,  2008.

Abstract

Life table studies of Plutella xylostella revealed that the larvae fed on Gibberalic acid (GA₃) + Pseudomonas fluorescens treated cauliflower leaves had a gross reproductive rate (GRR) of 89 and 86.4 female eggs per female on the untreated and treated leaves, respectively. The value of net reproductive rate (Ro) was 69.54 and 61.05 indicating that P. xylostella multiply 69.54 and 61.05 times on the untreated and treated leaves in the generation time (T) of 24.37 and 25.69 days, respectively. The species had an intrinsic rate of natural increase of 0.17 and 0.15 females per day on untreated and treated leaves with a daily finite rate of increase (λ) of 1.19 and 1.17 females per day, the population would multiply 3.38 and 3.06 times every week. The doubling time (DT) of the population was 4.01 days on untreated and 4.34 days on treated cauliflower leaves.

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Key words

Life table, Plutella xylostella, cauliflower, gibberalic acid, Pseudomonas fluorescens.

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