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Life History Traits of Cricula Trifenestrata (lepidoptera: Saturniidae) Feeding on Mangifera Indica

M. R. Amin
Department of Entomology, Hajee Mohammad Danesh Science and Technology University,Dinajpur 5200, Bangladesh

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

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

D. A. Tithi
Department of Entomology, Hajee Mohammad Danesh Science and Technology University,Dinajpur 5200, Bangladesh

Abstract/ Executive Summary:

The study was conducted to know the life history traits of Cricula trifenestrata feeding on the leaves of Mangifera indica in the laboratory condition. Results revealed that the fecundity of a female moth was 141.7 ± 11.79, and observed hatching rate was 88.81 ± 1.37%. The pre-ovipostion, oviposition, larval and pupal period was found 2.3 ± 0.37, 0.5 ± 0.03, 28.5 ± 0.78 and 19.55 ± 0.59 days, respectively. The larvae passed through five instars and their consecutive durations were 5.3 ± 0.3, 5.1 ± 0.31, 6.1 ± 0.35, 5.8 ± 0.33 and 6.2 ± 0.33 days. The longevity of male was found 2.9 ± 0.38 days and the female was 4.2 ± 0.28 days. The final instar larvae consumed the highest amount of leaf; while the 1st, 2nd, 3rd, 4th and 5th instar larvae consumed 0.50, 1.20, 2.80, 8.50 and 16.40g leaves, respectively. This information will help to develop effective control measure against this insect pest.

Keywords: Life history, Cricula trifenestrata

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

Start Date: 00-04-2007

End Date: 00-07-2007

Program Area: Knowledge Management

Commodity: Mango

Objectives:

1. The present study was undertaken to know the detail life history traits of mango defoliator.

Methodology:

Collection and rearing of insect: The life history traits of C. trifenestrata were studied in the laboratory of the Department of Entomology, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during the period of April to July 2007. Male and female moths of C. trifenestrata were collected from the mango plant of BRAC centre, Dinajpur. For mating, five pairs of moths consisting of equal sex ratio were released in a small mango tree of HSTU campus. The tree was covered with thin net to restrict the movement of the moths. The adult females were observed regularly at eight hours interval for their oviposition behaviour. Biology: After mating the female moths laid eggs in rows at the edge of the mango leaves. The eggs were collected and they were kept in the laboratory at 25 ± 2ºC and 75 ± 5 % (RH) for hatching. After emergence, the 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 petridish). Medium aged fresh mango leaves (variety fazlee) were supplied every morning to each petridish as food and the leaves were renewed at 12 hours interval. Wet cotton was used to keep them fresh. Data were collected carefully to record the duration of developmental stages such as 1st, 2nd, 3rd, 4th and 5th instars larvae and the time of moulting on the basis of casting exuviae. The time elapsed between adult emergence and the first egg deposition was counted as the pre-oviposition period. The oviposition period was considered as the duration between the first and last egg laid by the female. Incubation period was considered the duration between the egg laying and egg hatching. The pre-pupation period was calculated by the time elapsed between the stopped of feeding and the pupation. Measurement of leaf consumption: The amount of leaf consumed by each larval instar was measured daily by subtracting the weight of leaf before and after consumption. A mettler digital balance was used for this purpose. From laboratory stock culture, one newly hatched first instar larva was released into each petridish with ten replications. The medium mature leaves were supplied by making small pieces with the help of a sharp scissor. The initial weight of supplied leaf pieces in each petridish was taken separately. The amounts of leave (g) consumed by a larvae within 24 hours were measured following the formula: A = B – (C+D); where, A = weight of consumed leaves (g), B = initial weight of supplied leaves (g), C = weight of remnant leaves (g) and, D = weight of moisture loss from the control petridish (g).

Source of Information: J. Agrofor. Environ. 2(1): 1-6, 2008;ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The information of the present study indicated an increased knowledge on the life history of C. trifenestrata that will be helpful for its management.

Knowledge Management: Journal