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Effect of Larval Population Densities of Mulberry Silkworm, Bombyx Mori on the Rate of Cocoon Production and Adult Longevity

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

S. B. Huq
Department of Entomology, Bangladesh Agricultural University Mymensingh.

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

Abstract/ Executive Summary:

A laboratory experiment was conducted with three mulberry silkworm races namely, 05 yellow, RB 112 and Nistari 114 to find out the effect of five different larval densities viz. 75, 100, 125, 150 and 175 per 0.09 m² on cocoon production rates and adult longevity in controlled conditions ( 28+1^oC temperature and 78 +1% relative humidity). It has been observed that with the increase of larval densities cocoon production as well as adult longevity decreased. Population density 100 ( P₁₀₀) per 0.09 m²may be used for increased cocoon production, longer adult longevity and economic rearing.

Keywords: Population density, Cocoon production, Adult longevity

Location: Bangladesh Agricultural University, Mymensingh.

Start Date: 00-00-1987

End Date: 00-00-1987

Program Area: Pest Management

Commodity: Diseases and insects

Objectives:

To observe the effect of different larval population densities on the parameters.

Methodology:

A laboratory experiment was conducted at Sericulture Project Laboratory of the Bangladesh Agricultural University, Mymensingh in 1987 with three races of mulberry silkworm, Bombyx mori L. namely, 05 yellow, RB 112 and Nistari 114. Tha larval population densities 75, 100, 125, 150 and 175 in experimental trays of 30 x 30 x 15 cm sizes, were tested in a completely randomized block design (CRBD) with three replications. The third instar larvae were transferred to the experimental trays with different population densities and reared upto pre-spinning stage. Food was offered 4 times and bed cleaning was done once in a day. Cocoon production were recorded after three days of spinning in the chandraki (bamboo montage). Twenty healthy cocoons including ten male and ten female pupae, were selected from each replication. The cocoons we re cut open from one end and transferred to another tray of similar size. The adults emerged after completing their pupal periods and the longevity of adults were recorded. All data were statistically analyzed.

Source of Information: Prograssive Agriculture, Vo-1 (1), 93-96, 1990

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Experimental results showed that larval population density greatly influenced the cocoon production and adult longevity. The more the population density, the less are the rate of cocoon production and adult longevity. It may be concluded that though performance of P₇₅ is excellent but for better production rate and adult longevity as well as economic return, population densities 100 per 0.09 m² may be accepted and practiced in farmers' level.

Knowledge Management: Journal