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Effect of Larval Population Density on the Rearing of Eri-silkworm, Philosamia Ricini Hutt

M. A. Haque
Department of Entomology, Bangladesh Agricultural University, Mymensingh

M . Hossain
Department of Entomology, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Larvae of Eri-silkworm, Philosamia ricini Hutt. were reared separately on castor and cassava in trays of 0.9x0.6 m² at 27⁰C temperature and 80% relative humidity in the laboratory. Each rearing tray consisted of larval population 50,75,100,125,150,175,200, 225,250 and 275. Comparing the improvement of larval and post-larval characters it was found that the limit of maximum rearing for Eri-silkworm in such tray was 150 worms.

Keywords: Eri-silkworm, Population density and Rearing porformance

Location:

Start Date:

End Date:

Program Area: Resource Development and Management

Non-commodity: Performance

Objectives:

To determine the effect of different larval population density on larval and post-larval characters which ultimately suggest an optimum larval population for its rearing in a tray of 0.9x0.6m²

Methodology:

The emerging Eri-silkwcrms were fed separately on chopped tender leaves of castor and cassava. The larvae, when reached third instar, were arranged in two groups feeding separately on castor and cassava leaves. Each of the groups consisted of 50, 75, 100, 125.150, 175, 200, 225, 250 and 275 larval population in trays measuring 0.9x0.6 m². All the treatments were replicated thrice. The food was offered four times a day at six hours intervals. The rearing trays were cleaned once a day in the morning removing simultaneously dead and diseased worms, if any. The experiment was conducted in the laboratory with mean temperature 27°C and relative humidity 80%. Observations were made on different aspects of larval and post-larval characters. Measurement of larval length, breadth and weight were recorded only in case of fifth instar larvae. The data were analyzed following Completely Randomized Design (CRD) and Dun can's New Multiple Range Test.

Source of Information: Bangladesh J. Agril. Sci. 18 (1): 61-64 January,1991

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Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It can, therefore, be concluded from the foregoing discussion that the limit of maximum rearing for Eri-worms appear to be round about 150 worms in a tray of 0.9x0.6 m²^.

Knowledge Management: Journal