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Rate of Development of Brinjal Plant Aphid, Aphis Gossypit Glover (homoptera : Aphididae) at Two Constant Temperatures

K.N. Shahjahan Karim
Department of Zoology, Rajshahi College. Rajshahi-6100

M. Matiur Rahman
BCSIR Labs. Rajshahi-6206.

Abstract/ Executive Summary:

A time temperature data related to the development up to the pre- reproductive period of a generation of Aphis gossypii Glover at two constant temperatures. 15±0.5°C and 25±0.5°C were recorded. The mean development of nymphs up to pre-reproductive period has been calculated as 15.40±1.35 and 7.89±1.32 days, respectively. The percent development per day found to be 0.154±0.015 and 0.079±0.013, respectively. On the basis of development at two different constant temperatures, the value of 'developmental zero' and 'thermal constants' expressed in day⁰C was found to be 4.116 and 162.826 and the number of generations of A. gossypii at Rajshahi has been estimated to be 47.698.

Keywords: A. gossypii, Brtnjal plant, Constant temperature, Developmental zero

Location: Rajshahahi

Start Date:

End Date:

Program Area: Pest Management

Commodity: Brinjal

Objectives:

To study the development of A. gossypii under two different constant temperatures.

Methodology:

The aphids were reared at two different temperatures i.e. 15±0.5° and 25±0.5°C in a constant temperature incubator. For rearing, adult female aphids were collected from the brinjal plants Solanum melongena var. Muktakeshi grown in the field and were kept in separate petridishes (7.5 cm diameter) in laboratory. Leaf discs of 3.5 cm diameter were cut from mature leaves and floated on Knop's nutrient solution. Aphids were transferred carefully with the help of camel hair brush. In most of the experiments freshly laid nymphs were reared singly on discs from the first instar until they moulted to adults. Their progeny were also reared on leaf discs up to the pre-reproductive period. For each temperature five replications were observed. Data were recorded up to that time when they laid their first nymph. Fresh leaves were introduced regularly in each petridish. Constant observations were made to record the moulting and larvipositions. A plastic tray (30 x 25 x 5 cm) containing saturated solution of sodium chloride was kept at the bottom of the incubator to maintain a relative humidity of 75±2%.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 24(2) : 193-198, 1998

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A time temperature data related to the development up to the pre- reproductive period of a generation of Aphis gossypii Glover at two constant temperatures 15±0.5°C and 25±0.5°C were recorded. The mean development of nymphs up to pre-reproductive period has been calculated as 15.40±1.35 and 7.89±1.32 days, respectively. The percent development per day found to be 0.154±0.015 and 0.079±0.013, respectively. On the basis of development at two different constant temperatures. the value of 'developmental zero' and 'thermal constants' expressed in day⁰C was found to be 4.116 and 162.826 .

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