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Screening of Tomato Lines/varieties Against Early Blight Disease Under Natural Field Condition

R. Islam
Plant Plant Pathology Division, BARI

. K. M. Alam
Plant Plant Pathology Division, BARI

M. S. Rahman
Plant Plant Pathology Division, BARI

A. Ayub
Plant Plant Pathology Division, BARI

Abstract/ Executive Summary:

An experiment was conducted in the research field of Plant Pathology Division, BARI during 2014-15 cropping season to evaluate the performance of twenty four tomato lines against early blight disease. Seventeen lines and seven varieties of tomato were used. Two tomato lines showed highly resistant reaction. Among the others, five lines were seems to be resistant and twelve lines/varieties were moderately resistant.

Keywords: Alternaria solani, Tomato, Early blight

Location:

Start Date: 00-00-2014

End Date: 00-00-2015

Program Area: Pest Management

Commodity: Tomato, Diseases

Objectives:

The present study was undertaken to find out resistant varieties/lines against early blight disease of tomato.

Methodology:

A study was conducted to screen twenty four tomato genotypes against natural infection of early blight of tomato caused by Alternaria solani. Disease appeared late in the season but spread quickly and uniformly. eight plants were selected for each treatment and disease severity was assessed in three stage of development at fifteen days interval by using 0-5 scale (Mayee and Datar, 1986) and described as 0= less than one per cent leaf area infected, 1= 5-11 per cent leaf area infected, 2= 6-20 per cent leaf area infected, 3= 21-40 per cent leaf area infected, 4 = 41-70 per cent leaf area infected and 5 = more than 71 per cent leaf area infected. Percent disease index (PDI) was calculated by using the formula given by Wheeler (1969).

Sum of individual ratings

Percent disease Index = ----------------------------------------------------- x 100

No. of plants examined x disease scale

Disease reaction based on PDI was recorded according to the scale.

Disease reaction PDI range
Highly resistant	0-10.0
Resistant	10.1–25.0
Moderately resistant	25.1–40.0
Susceptible	40.1–50.0
Highly susceptible	50.1 and above

Source of Information: Annual Research Report, Plant Pathology Division, BARI-2014-15

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Percent disease incidence (PDI) and disease resistant reaction of 24 lines/varieties against early blight disease of tomato have been studied. Variable disease resistant reaction was observed on the basis of PDI and disease score. Among the 24 lines/varieties only two tomato lines namely GPT- 009 and GPT- 0011 were graded as highly resistant against early blight of tomato where PDI ranged from 5 to 10. Five lines namely BARI Tomato-9, P₃ x P₅, P₅ x P₉, P₅ x P₈, SL- 003, SL- 0011 were found resistant and 12 lines/varieties namely BARI Tomato-3, BARI Tomato-8, BARI Tomato-14, BARI Tomato-15, P₁ x P₅, P₁ x P₉, P₂ x P₆, SL- 012, GPT- 015, P₈ x P₉, GPT- 053, SL- 010 were seems to be moderately resistant. Two tomato lines/varieties like BARI Tomato-11, P₁ x P₇were susceptible and rest of the lines like BARI Tomato-2, P₄ x P₉were found highly susceptible. The moderately resistant lines will be tested further for confirmation with other germplasm. GPT- 009, GPT- 0011, BARI Tomato- 9, P₃ x P₅, P₅ x P₉, P₅ x P₈, SL- 003, SL- 0011 gave low disease incidence and have some resistant against Alternaria Solani, More lines need to include for next year.

Knowledge Management: Report/Proceedings