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Morphometrics Measurement of Mango Defoliator Cricula Trifenestrata (f. Lepidotera: Saturniidae)

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

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

M. S. Hasan
Lecturer
Department of Plant Pathology, Hajee Mohammad Danesh Science &Technology University, Dinajpur 5200

M. F. Uddin
Horticulture Specialist
Horticulture Centre, Natore

A. K. M. N. Islam
Deputy Director
Bangladesh Agricultural Development Corporation, Rajshahi, Bangladesh

Abstract/ Executive Summary:

Science and Technology University (HSTU), Dinajpur during April to July, 2007 at 25 ± 2ºC and 75 ± 5 % RH ( at room temperature and humidity) to study the morphological measurement of mango defoliator Cricula trifenestrata. The results of morphometric measurement reveal that the average length and breadth of eggs were 2.27 and 1.86 mm, respectively. The mean length and breadth of 1st, 2nd, 3rd, 4th and 5th instar larvae were 4.08, 13.90, 30.09, 61.37, 81.49 and 2.17, 5.09, 7.23, 11.22, 15.51 mm, respectively. The average length and breadth of male and female cocoon were 41.98, 50.89 and 12.31, 16.22 mm whereas the length and breadth of male and female pupa were 31.64, 35.57 and 10.61, 12.58 mm, respectively. The average length and breadth of male and female moth were 22.35, 32.48 and 32.02, 74.14 mm, respectively.

Keywords: Morphometric measurement, Mango defoliator, Cricula trifenestrata

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

Start Date: 00-04-2007

End Date: 00-07-2007

Program Area: Pest Management

Commodity: Mango

Objectives:

To study the morphological measurement of mango defoliator Cricula trifenestrata.

Methodology:

A study on the morphological measurement of mango defoliator Cricula trifenestrata were conducted in the laboratory of Department of Entomology, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during the period of April to July, 2007 at 25 ± 2ºC and 75 ± 5 % RH ( at room temperature and humidity). Male and female moths of C. trifenestrata were collected from the mango plant of HSTU, Dinajpur campus. Five pairs of moths consisting of equal sex ratio were released in a small mango tree of HSTU campus and covered with thin net for mating. The adults female were observed regularly at eight hours interval for their oviposition. After mating the female moths laid eggs in rows at the edge of the mango leaves. The eggs were allowed to hatch. Then the newly hatched first instar larvae were carefully collected with the help of a soft camel hair brush and were individually transferred in ten Petridishes (one larva in each Petridis). Medium aged fresh mango leaves (var. Fazlee) were supplied every morning to each Petridis as food and the leaves were renewed at 12 hours interval. Wet cotton was used to keep them fresh. Data were carefully measured the size of eggs, the larvae, pupae, cocoon and the adults. For the measurement of length and breadth of the eggs an oculomicroscope (oculomicrometer) was used. The length and breadth of different larval instars and adult moths are measured with the help of millimeter scale. The experiments were conducted using Completely Randomized Design (CRD) with 10 replications. The data were analyzed statistically.

Source of Information: Int. J. Sustain. Crop Prod. 3(3):45-48, 2008

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The moths are nocturnal and they are yellowish or reddish in colour. The male possesses two dark spots on the forewing; the smaller one is anterior to the oblique line, and the larger one to just below the anterior margin. The females had 3 large irregularly transparent spots on the forewings and a single one on the hind wing. Near the base of forewings a dark wavy line appeared. Head, thorax, abdomen and appendages of the moth was covered with scales, which were yellowish brown. The bi-pectinate antennae were long with indefinite number of segments. The antenna of male was broader than that of female. The female moth was larger than male in size, and the last abdominal segments of female were broader than that of the male. The length of male moth was 21 to 24.2 with an average of 22.35 ± 0.31 mm and breadth was 31 to 33.4 mm with an average of 32.02 ± 0.28 mm, while the length of female moth was 31.10 to 34.20 mm with an average of 32.48 ± 0.34 mm and the breadth was 72.10 to 76.20 mm with an average of 74.14 ± 0.36 mm, respectively.

Knowledge Management: Journal