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Effect of Planting Date on the Incidence of Eggplant Aphid, Aphis Gossypii Glover and Yield of Eggplant

M. Matiur Rahman
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Pankoj Kumar Sarker
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Bidhan Chandra Das*
Department of Zoology, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

Impact of planting dates on Aphis gossypii Glover infestation and yields of eggplants was studied in the field. The aphid population was very low (4.75-31.05 aphids/plant) on the first planted crops. Yield of first planting dates were higher (1.56-3.58 kg/plant), however; aphid population on the successive late planting crops gradually increased and reached to peaks at third planting dates (15.51- 96.46 aphids/plant). Yield of eggplant gradually decreased on successive late planting crops and lowest yield recorded for third planting crops (1.06-1.88 kg/plant).

Keywords: Planting date, Aphis gossypii and Eggplant.

Location: Research field of Zoology Department, Rajshahi University campus

Start Date: 00-00-2005

End Date: 00-00-2008

Program Area: Crop-Soil-Water Management

Commodity: Insects

Objectives:

The objects of the present study were:

To study the influence of planting date on the abundance of A. gossypii infesting the aforesaid varieties of eggplant crops, and
To assess the yields of these varieties in relation to the aphid infestation.

Methodology:

Experimental design: For the assessment of impact of planting dates on aphid infestation and yield on twelve varieties of eggplant for three planting dates of three consecutive seasons (2005-2006, 2006-2007 and 2007-2008), the same experimental fields were used in the research field of Zoology Department, Rajshahi University campus. Altogether 36 blocks (each 1.35 sq. meters) each contained three replicated plots were used. Twelve varieties of eggplants, viz. Kajla, Uttara, Nayantara (BARI released varieties), Singnath, Islampuri, Jhumka, Chakri, Khotkhotia, Ananda, Ullash and Tabla (local varieties) were selected and were planted at different dates- 12th September, 2nd October and 22nd October. All plots received equal amount of fertilizers and two times of irrigations and more or less uniform mulching. Data collection: Data were collected on the number of aphids per plant on twelve varieties of eggplants for three planting dates and three seasons, once in a week. From each plant, three leaves (one each from top, middle and bottom) were selected for the aphid counting. The alate, nymphs and apterae were counted at weekly intervals for sixteen weeks. Yield assessment: The eggplant fruits from each plant (in kg) were collected every 5-7 days interval. The harvesting was continued till the end of the fruiting. Only mature and marketable size fruits were harvested and the harvested fruits were weighted to assess yields of each varieties and planting dates. Statistical analyses were performed to asses the differences in the yields in different planting dates and varieties. Data analysis: Analyses of variance (ANOVA) were done to find out difference among the yields of twelve varieties of eggplant in respect of planting dates. The yields were compared using Duncan’s Multiple Range Test (DMRT). Correlations of coefficients (‘r’ values) were determined to examine the type of relationships between the aphid populations and the yields.

Source of Information: Bangladesh J. Zool. 39(2): 187-194, 2011

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present study shows that early planting eggplants had less aphid infestation and produced better yields than late planting. The eggplant variety Kajla was found to be most suitable among all experimental cultivars (both BARI and local).

Knowledge Management: Journal