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Effect of Temperature on the Bahaviour of Epilachna Beetle (epilachna Dodecastigma Wied.) Among Different Brinjal Varieties

S. Das
Agrotechnology Discipline, Khulna University, Khulna

M. M. Uddin
Depertment of Entomology, Bangladesh Agricultural University, Mymensingh

K. S. Islam
Depertment of Entomology, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

An experiment was carried out to study the effect of temperature on biology, oviposition and feeding behaviour as well as host preference of Epilachna beetle, Epilachna dodecastigma (Wied.) on eight varieties of brinjal, Solanum melongena Linn. from November, 2009 to June, 2010 maintaining controlled temperatures of 15ºC, 25ºC and 30ºC using an incubator in the Department of Entomology, BAU, Mymensingh. Temperature has a profound influence on the oviposition and food consumption of Epilachna beetle. In incubator at 15^oC, 25^oC and 30^oC temperature, larval daily average food consumption (mm²) among eight host plant varieties of S. melongena was the highest on Thamba and the lowest on Bijoy, whereas adults daily mean food consumption at three temperature regimes was the highest on Thamba and the lowest on BAU-2 at 15^oC and 25^oC temperature and at 30^oC temperature the lowest recorded on Bijoy. At 25^oC temperature, the highest oviposition was recorded on Thamba and the lowest found on Jhumki. Similarly at 15^oC and 30^oC temperature, the highest oviposition was also observed on Thamba and the lowest on Bijoy. Thus, the varieties namely Thamba, ISD 006 and Kazla appeared to be preferable hosts, whereas Bijoy, BAU-2 and Jhumki seemed to less preferable. The results revealed that temperature had direct effect on the behaviour and 25°C temperature was congenial to both fecundity and food consumption of the Epilachna beetle.

Keywords: Behaviour, Brinja variety, Effect, Epilachna beetle, Temperature

Location: Department of Entomology,Bangladesh Agricultural University (BAU),Mymensingh

Start Date: 00-11-2009

End Date: 00-06-2010

Program Area: Pest Management

Commodity: Brinjal

Objectives:

1. To study the effect of temperature on biology, oviposition and feeding behaviour as well as host preference of Epilachna beetle, Epilachna dodecastigma (Wied.) on eight varieties of brinjal, Solanum melongena Linn. maintaining controlled temperatures of 15ºC, 25ºC and 30ºC using an incubator. BAU, Mymensingh.

Methodology:

To conduct different experiments a stock culture of huge number of larvae and adult beetles of Epilachna dodecastigma was reared in the laboratory. Adults of the beetle were collected from the cultivated brinjal plants of the field at BAU, Mymensingh. Insects were sexed and paired (male and female) and one pair of insects was kept per Petri dish (15 cm diameter). They were allowed to To study the influence of temperature on the food consumption and oviposition of the beetle an experiment was conducted at three distinct temperatures viz. 15 ± 1ºC, 25 ± 1ºC and 30 ± 1ºC on eight host plant varieties of S. melongena (BAU-2, Bijoy, Irri begun, ISD-006, Islampuri, Jhumki, Kazla and Thamba) in the laboratory of Entomology Department, BAU using an incubator. At controlled temperatures of 15 ± 1ºC, 25 ± 1ºC and 30 ± 1ºC in incubator, the leaves of eight preferred varieties of host plant were used as food both for larvae and adult beetle. The insects were released in the Petri dishes with leaves as food and then these Petri dishes were put inside the incubator. The quantity (mm2) of food consumed by both larvae and adults per day was measured using square millimeter graph paper. Three replications were made for each variety at three different temperatures. Newly emerged adults were sexed and a pair of insects (male and female) from stock culture was released in each Petri dish containing leaves of a variety as their food. The temperature was controlled as, 15 ± 1ºC, 25 ± 1ºC and 30 ± 1ºC in the incubator. The number of eggs laid on each variety was counted daily. Three replications were made for every variety at each temperature. Host preference of Epilachna dodecastigma on eight varieties of brinjal was determined in the laboratory of the Department of Entomology, BAU which was done by measuring the food (leaves) consumption (mm²) of the beetle at three temperature regimes of 15 ± 1ºC, 25 ± 1ºC and 30 ± 1ºC. The adult beetle was released in each Petri dish containing fresh-tender leaf of a variety of host plant that was replicated three times and food consumption was estimated regularly and thereby finally revealing their host preference. The preferred variety was determined depending on the amount of leaf area eaten by both larvae and adults. Fresh leaves were provided to the insects in the Petri dishes and waste products and excreta were removed every day. Data obtained from different experiments on oviposition, food consumption and host preference of E. dodecastigma among eight varieties of brinjal were analyzed using analysis of variance in Completely Randomized Design (CRD). The mean values were ranked by Duncan's New Multiple Range Test.

Source of Information: J. Environ. Sci. & Natural Resources, 5(1): 167 - 172, 2012; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results revealed that temperature had direct effect on the behaviour and 25°C temperature was congenial to both fecundity and food consumption of the Epilachna beetle.

Knowledge Management: Journal