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Aphid Incidence and Its Correlation with Different Environmental Factors

M. R. Hasan
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. Ahmad
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. H. Rahman
Department of Entomology, Patuakhali University of Science and Technology, Dumki, Bangladesh

M.A. Haque
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The aphid incidence and its correlation with environmental factors were studied. Mustard variety “Sampad” was used as test crop. Aphid incidence varied significantly at various parts of mustard plant and time of the day. The highest number of aphid was observed in the vegetative parts of the mustard plant in the morning. High cloudiness, relative humidity and dew point favoured the aphid population and slight rain fall quickly declined the aphid population. Among the different environmental factors maximum temperature, dew point and sun shine hours were positively correlated with aphid population and minimum temperature, relative humidity and wind speed were negatively correlated with aphid population.

Keywords: Mustard aphid, Incidence, Environmental factors

Location: Crop Botany Department, Bangladesh agricultural University (BAU), Mymensingh

Start Date: 00-00-2009

End Date: 00-00-2009

Program Area: Pest Management

Commodity: Insects

Objectives:

1. To find out the aphid incidence at different parts of mustard plant (e.g. vegetative, flowering and fruiting,) and different times of the day (e.g. morning and afternoon). In addition, aphid incidence and its correlation with different environmental factors were studied.

Methodology:

The experiment was conducted at the experimental farm of the crop Botany Department, Bangladesh agricultural University (BAU), Mymensingh. Mustard variety “Sampad” was used in the experiment. Incidence of mustard aphid, Lipaphis erysimi (Kalt.) and its population build-up was recorded two times daily to estimate total and mean number of aphid population from 10 selected mustard plants on different parts of plant at different times of the day counting of aphids (nymphs and adults) under natural field condition. The whole plant was divided into three parts namely vegetative parts (Shoots and Leaves), flowering parts and fruiting parts. Each part was observed carefully and number of aphid counted daily two times at 8.00 am and 3.00 am with the help of magnifying lens. During the whole period the daily temperature, rainfall, dew point, sunshine and wind speed data were collected from weather yard, Dept. of Irrigation and water management, BAU, Mymensingh. The experimental data were analyzed following Completely Randomized Design (CRD) using MSTAT Programme. The Significant means were compared by DMRT. Correlation test was also done.

Source of Information: J. Bangladesh Agril. Univ. 7(1): 15–18, 2009; ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It was also found that high cloudiness, relative humidity, dew point favoured the aphid incidence and slight rainfall quickly declined the aphid population from the field.

Knowledge Management: Journal