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Screening of Diversified Germplasm of Corchorus Spp.for Resistance/tolerance to Yellow Mite (polyphagotarsonemus Latus).

Hasina Banu
Principal Scientific Officer
Entomology Department, Pest management Division, BJRI,Manik Mia Avenue, Dhaka-1207

Abstract/ Executive Summary:

Fifty-three accessions of Corchorus spp. were screened against yellow mite in the greenhouse premises along with 0-9897 as check variety. Among the fifty three accessions only one accession no. 1040 received raring score `2’. Among the 15 previously selected lines none was found resistant/tolerant to yellow mite Accession no. 2511, which was found, promising in the last year received rating score `3’ in the field screening. Mite infestation was very poor at Central station and was comparatively high at Chandina and JAES. No significant result were obtained from the field

Keywords: Screening, Resistant,Tolerant, Germplasms,Yellow mite, Jute

Location: Central station, JAES, Manikganj and Chandina

Start Date: 30-04-2001

End Date: 30-10-2001

Program Area: Variety and Species

Commodity: Plant

Objectives:

1.To identify sources of resistant/tolerant jute germplasms against yellow mite

2.To help the Breeders in evolving pest resistant/tolerant varieties.

3.To development of resistant/tolerant varieties will help in reducing the cost of production since it does not involve any extra cost for pest control.

Methodology:

A)Data on preliminary screening were recorded from the experiment fields of Gene Bank Department. B)Preliminary selected accessions were grown in pots in the greenhouse premises. There were 5 plants per pot and each treatment were replicated 3 times. The plants were artificially inoculated with yellow mite. Infestation percentage of jute plants will be recorded at 15 days after artificial infestation. The damage plants or leaves will be graded by using the following formula (Lateef & Reed 1943). X-Y Pest resistance percentage = ----------- x 100 X Where, X = Percentage of infested plants or leaves in check (control) Y= Percentage of infested plants or leaves in test The percentage of infestation was calculated by the following formula Percentage of plants or leaves infested B Pest resistance percentage = ----------- x 100 A A= No. of total plants B= No. of infested plants

Source of Information: Annual report, 2001, BJRI

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Three thousands taka only

Total Budget (Tk.) : Three thousands taka only

Achievement/Findings:

Among the fifty three accessions only one accession no. 1040 received raring score `2’. Among the 15 previously selected lines none was found resistant/tolerant to yellow mite. Mite infestation was very poor at Central station and was comparatively high at Chandina and JAES. No significant result were obtained from the field

Knowledge Management: Report/Proceedings