Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Effect of Larval Population Densities of Silk Worm on Larval and Cocoon Characteristics

F.A.Talukder
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202

M. Hossain
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202

M. Shahjahan
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202

A.K.M M. Rahman
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202

A. B. Khan
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

Effect of different larval population densities (viz.75, 100,125. 150 and 175) from 3rd instsr to pre-spinning stage of three silkworm Bembyx mori L. races namely, Nistari-114 (M). RB- 11(P) W and 05 Yellow (M) on larval and cccoon characteristics was studied. increase in population densities from 75 to 175 had adverse effect on larval and ccccon characteristics. But the variation in densities 75 and 100 was found insignificant for most of the characteristics. Population density 100 per 900 cm^₂ may be considered suitable for economic rearing of silkworm larvae.

Keywords: Larval length, Weight, Mortility, Cocoon weight, Shell weight

Location: Sericulture Project Laboratory of the Bangladesh Agricultural University, Mymensingh

Start Date: 01-03-1987

End Date: 30-04-1987

Program Area: Crop-Soil-Water Management

Non-commodity: Performance

Objectives:

To observe the effect of different population densities on the various larval and post-larval characteristics.

Methodology:

Laboratory experiments were conducted at Sericulture Project Laboratory of the Bangladesh Agricultural University, Mymensingh during March April, 1987 with three races of mulberry silkworm namely, Nistari-114 (M). RB-11(P) W and 05 Yellow (M) using five population densities viz. 75, 100, 125, 150 and 175, from 3rd instar to pre-spinning stage, for each race. The experiment was set in a completely Randomized Block Design with three replications. Necessary silkseeds and facilities were provided by Sericulture Project, B.A.U. Eggs were hatched and reared on a bamboo tray (30 cm in diameter) up to 2nd moulting. The early 3rd instar larvae, consisting of required population (75, 100, 125, 150 and 175), were transferred to the experimental trays ( 30x30x15 cm) and reared up to pre-spinning stage. Food was offered 4 times a day. Unconsumed leaves, larval faces, dead larvae, etc. were removed once in a day by bed cleaning. Larval length and weight were measured from the average of 10 newly ripen larvae of pre-spinning stage and mortality was counted every day from the very beginning of the experiment up to pre-spinning stage. Post larval characteristics were measured after 3 days of spinning in the same way.

Source of Information: Bangladesh J. Agril. Sci. 18 (1): 15-18 January, 1991

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that populat.ion densities above 100 per 900 cm^₂ may adversely affect the larval and cocoon characteristics resulting in the decrease of silk yield. For economic rearing, P₁₀₀ may be accepted because of its statistically similar effect with P₇₅, although P₇₅ indicated apparently the best performance.

Knowledge Management: Journal