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Biology and Morphometrics of Hogplum Beetle, Podontia 14-punctata L. (chrysomelidae: Coleoptera)

Md. Jashim Uddin
MS student
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh.

Dr. Md. Mohasin Hussain Khan
Professor
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

Abstract/ Executive Summary:

The mean duration of 1^st, 2^nd, 3^rd and 4^th instar larvae, prepupae and pupae was 4.16, 3.55, 3.90, 3.60, 2.40 and 24.80 days, respectively. The female beetle lived longer than the male. The average life span of the male and female beetle was 95.10 and 101.30 days, respectively. The mean length of 1^st, 2^nd , 3^rd and 4^th instar larvae were 2.81 mm, 9.27 mm, 16.42 mm and 22.10 mm, respectively and head width of 1^st, 2^nd , 3^rd and 4^th instar larvae was 0.72 mm, 1.63 mm, 2.45 mm and 3.08 mm, respectively. The length of male and female beetle ranged from 11.00 mm to 12.70 mm with a mean value of 11.96 mm and 14.5 mm to 16.0 mm with a mean value of 15.31 mm. The mean breadth of male beetle across head, thorax and abdomen 4.2 mm, 6.1 mm and 4.07 mm, respectively. The mean breadth of female beetle across head, thorax and abdomen was 6.83 mm, 8.25 mm and 6.42 mm. The length of the antenna ranged from 6.70 to 8.00 mm and the length of pro, meso and metathoracic legs was 9.27 mm, 9.60 mm and 11.60 mm, respectively. The mean length of fore (elytra) and hind wings were 12.30 mm and 16.10 mm. The mean breadth of fore and hind wings were 5.40 mm and 7.80 mm.

Keywords: Biology, Hogplum beetle, Morphometric, Podontia 14-punctata

Location: Entomology laboratory, PSTU

Start Date: 01-04-2012

End Date: 30-09-2012

Program Area: Pest Management

Commodity: Insects

Objectives:

To investigate the biology and morphometrics of hog-plum beetle.

Methodology:

Experimet were done in the laboratory of Entomology Department of PSTU during April to September, 2012. Normal room temperature (32 ± ⁰C) and relative humidity (85 ± 5%) with a 14 ± 2:10±2 light and dark cycle (L:D) following completely randomized design (CRD) with 3 replications. Biology of 14-punctata under laboratory condition : Ten pair of healthy adult beetles were collected from hog-plum trees in couples at mating condition in the morning. After collecting, each couple was released in a separate plastic pot (26.6×14.2×12.2 cm) provided with fresh hogplum leaflets wrapping with cotton soaked in sugar solution. The number of eggs per cluster and total number of clusters laid by individual female were counted. The time and day of egg deposition were also recorded. Developmental periods of different stages of hogplum beetle Fifty newly hatched larvae were collected from hogplum trees planted in the hog-plum orchard at Rahamatpur of Barisal district. Developmental period of 1^st instar larvae was measured by the time elapsed between egg hatching to 1^st moulting. In this way the duration of 2^nd, 3^rd and 4^th (final) instars were recorded. Pupal period was also calculated by the time interval between cessation of feeding and hiding inside the soil for pupation. Morphometric of larvae and adult Measurement was taken just after each moult with measuring scale in mm. For this, ten observations, each for male and female adults were taken. Data on the morphometric measurements of different life stages viz., larvae, adult, and appendages viz., antennae, legs and wings were made. The weight of full grown larva, adult male and female was measured by using an electronic balance.

Source of Information: J. Patuakhali Sci. and Tech. Univ. 2014, 5(1):71-82

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the findings of the present study it may be concluded that most of the couples were started their mating from 6:30 am. The female beetle lived longer than the male. The length and breadth of female beetle were greater than those of male beetle. Among three pair of legs, the length of hind leg was the highest. The hind wings were greater in length and breadth compared to fore wings. Thus, this information could be helpful to the taxonomist and pest manager for the management of hogplum beetle in field.

Knowledge Management: Journal