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Morphometric Measurement of Lady Beetle Micraspis Discolor F (coleoptera: Coccinellidae)

Subrata Paul Chowdhury
M.S. Student
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200

M. A. Ahad
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200

M. S. Alam
School of Agricultural and Rural Development, Bangladesh Open University, Gazipur.

S. Karim
M.S. Student
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200

Md. Hakikul Islam
M.S. Student
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200

Abstract/ Executive Summary:

The experiment was conducted at the Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur. The length of the egg of Micraspis discolor was 1.2 ±0.02 and the breadth was 0.5 ±0.01mm. The length of 1st, 2nd, 3rd and the 4th instar larvae were 1.6 ±0.05 , 3.13 ±0.08 , 4.10 ±0.16 and 5.1 ±0.08 mm respectively; while their breadths were 0.62 ±0.02 , 0.70 ±0.06, 1.1 ±0.10 and 1.3 ±0.09 mm respectively. The average lengths of the male and female pupae were 3.1±0.08 and 3.3±0.09 mm respectively, and the breadths were 2.1±0.05 and 2.5±0.08 mm, respectively. The length and the breadth of the adult male were 4.1±0.06 and 3.3 ±0.08 mm and the female beetles were 3.7±0.05, 3.1 ±0.06 mm respectively.

Keywords: Morphometrics measurement, Lady beetle, Micraspis discolor (Fab.)

Location: Department of Entomology, Hajee Mohammad Danesh Science and Techonolgy University (HSTU), Dinajpur

Start Date: 00-01-2007

End Date: 00-04-2007

Program Area: Pest Management

Commodity: Beetle

Objectives:

Lady beetles are of great economic important as predaceous both in their larval and adult stages on various important crop pests such as aphids, coccids and other soft bodied insects (Hippa et al, 1978; Kring et al, 1985). The species M. discolor also feed on many inscet pests such as aphids, brown plant hoper, corn borer, Lepidopteron insects, mealy bug, white flies etc (Rao et al, 1989; Mani, 1995). But review of morphological characteristics and measurement of M. discolor is limited. The present study was, therefore undertaken to know the morphological characteristics of M. discolor.

Methodology:

The experiment was conducted at the laboratory of the Department of Entomology, Hajee Mohammad Danesh Science and Techonolgy University (HSTU), Dinajpur, during the period of January to April 2007 at 21.02⁰C ± 4.5⁰C and 66.05 ± 0.95 % RH. A culture of Micrapis discolor was established in the laboratory in order to supply necessary insects for the experiment. For this purpose, some males and females of M. discolor were collected by sweep net from the unsprayed horticulture field These beetles were sexed and paired in petridishes (6.0 x1.0 cm) for egg laying. The bottom of the petridishes was covered with blotting paper (Whitman filter paper no 1). Bean aphids were also collected daily with infested bean leaves, stems, twigs and inflorescences from the same unsprayed field and supplied as food. After hatching of eggs, the grubs were transferred to several medium sized petridishes (11cm diameter) and reared on bean aphid till adult emerged. Measurment on egg, larva, pupa and adult were taken based on 10 individual. For the measurement of length and breadth of the eggs oculomicroscope (oculomicrometer) were used. The length and breadth of different larval instars, pupa and adult beetles were measured with the help of ordinary millimeter scale

Source of Information: J. Sci. technol. (Dinajpur) Vol. 5: 94-97 (2007) ISSN 1994-0386

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The average lengths of the male and female pupae were 3.1±0.08 and 3.3±0.09 mm respectively, and the breadths were 2.1±0.05 and 2.5±0.08 mm, respectively. The length and the breadth of the adult male were 4.1±0.06 and 3.3 ±0.08 mm and the female beetles were 3.7±0.05, 3.1 ±0.06 mm respectively.

Knowledge Management: Journal