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Quantitative Relationships Between Some Selected Characters of Wheat Varieties/lines and Percentage of Pink Stem Borer Infestation

M. Shawkhatuzzaman
Soil Resources Development Institute, Farmgate, Dhaka

M. Shahjahan
Department of Entomology, Bangladesh Agricultural University, Mymensingh

M.M. Haque
Department of Agriculture Extension, Khamarbari, Dhaka

M.R. Islam
Department of Agriculture Extension, Khamarbari, Dhaka

M.E. Haque
Department of Agriculture Extension, Khamarbari, Dhaka

Abstract/ Executive Summary:

A field experiment was carried out at Bangladesh Agricultural University Field Laboratory, Mymensingh to study the quantitative relationships between some selected characters of wheat varieties/lines and their percentage of infestation of pink stem borer during 2002-2003 in field condition. The experiment was laid out in randomized block design (RCBD) with three replications. Correlation and regression coefficients, path analysis were carried out on the basis of the average plant character values and percentage of pink stem borer infestation. It is evidence from pink stem borer infestation model is in case of wheat the plant that contained lower height, broader stem diameter, minimum number of tiller per hill but higher number of leaf per hill, longer length and lower width of 3rd leaf and maximum presence of leaf chlorophyll can easily minimize the infestation of pink stem borer.

Keywords: Quantitative relationships, Selected characters, Wheat lines.

Location: Bangladesh Agricultural University Field Laboratory, Mymensingh

Start Date: 00-07-2202

End Date: 00-06-2003

Program Area: Pest Management

Commodity: Wheat

Objectives:

1. To screen out the tolerant or resistant wheat variety against this insect pest in field condition.

Methodology:

A field experiment was carried out at Bangladesh Agricultural University, Mymensingh to study the quantitative relationships between some selected characters of wheat varieties/lines and their percentage of infestation of pink stem borer during 2002-2003 in field condition. The 12 varieties/lines were Agrani, Akbar, Ananda, Gourab, Kanchan, Pavon, Progoti, Protiva, Sonalika, Sourav, BAW-923 and BAW-936. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Seeds were sown with a spacing of 20 x 25 cm in a unit plot of 20 m² (5x 4m). Cowdung and chemical fertilizers were applied at the rate of 15 tons and 220,140, 80 kg of urea, TSP and MP respectively per hectare in a recommended directions. Chemical control measures against pest were not taken but 2 irrigation at 20 and 60 DAS and intercultural operations were done. Data of morphological characters of plant viz. plant height (cm), stem diameter (cm), number of tillers per hill, number of leaves per tiller, length and width of 3rd leaf (cm) were collected from 10 randomly selected plants of each entry in a replicate at 40, 70 and 100 days of sowing (DAS). Stem diameter was recorded 5 cm or just above soil level with the help of a slide calipers/screw gauge. At 40 DAS the third leaf counted from the top down of the main stems and the leaves were collected for determining chlorophyll contents. At the same time, percentages of infestation of pink stem borer were also recorded at 40 and 70 DAS as dead hearts and white heads respectively. Data on morphological characters of plants and pink stem borer infestation under field condition were subjected to analysis of variance. Means were separated by DMRT. To determine the extent of interrelationship among pink stem borer infestation and wheat plant characters, correlation matrix for all possible data combinations was worked out. Correlation coefficients were further partitioned into characters of direct and indirect effects by path coefficient analysis taking all the characters into consideration. Pink stem borer infestations were considered to be resultant variable. The relative importance of each independent variable for pink stem borer was carried out separately by logistic regression model since the independent variable was in percentage form.

Source of Information: J. Agrofor. Environ. 7 (2): 117-120, 2013; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It is evidence from pink stem borer infestation model is in case of wheat the plant that contained lower height, broader stem diameter, minimum number of tiller per hill but higher number of leaf per hill, longer length and lower width of 3rd leaf and maximum presence of leaf chlorophyll can easily minimize the infestation of pink stem borer.

Knowledge Management: Journal