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Effect of Different Levels of Black Pointed Seed on Prevalence of Bipolaris Leaf Blight of Wheat

S.M.M. Hossain
Department of Plant Pathology, Faculty of Agriculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh

A.T.M.S. Islam
Department of Plant Pathology, Faculty of Agriculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh

S.M.E. Hassan
Department of Plant Pathology, Faculty of Agriculture, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted to evaluate the effect of different levels of black pointed seed on seeding emergence and prevalence of Bipolaris leaf blight disease of wheat. The treatments considering the levels (weight basis) of black pointed seed were To = apparently healthy with Vitavax -200 treated seed, T₁ = 3% black pointed seed, T₂ = 6% black pointed seed, T₃ = 10% black pointed seed, T₄ = 15% black pointed seed, T₅ = 20% black pointed seed and T₆ = 25% black pointed seed. The maximum emergence of seedling and plant population / m² (246.64 - 268.68) were recorded in To and those were minimum (182.58 -190.75) in T6 after 7 and 15 days of sowing. Tendency of decreasing seedling emergence was observed with increasing the level of black pointed seed. Percent diseased leaf area (%DLA) and percent disease incidence (PDI) on flag leaf (F) and flag penultimate leaf (F-l) increased with increasing age of the plant. The maximum and minimum, grain yield, apparently healthy seed, area under disease progress curve (AUDPC) for flag leaf and penultimate leaf were in T₆ and T₀, respectively.

Keywords: Leaf blight, Black point, Bipolaris sorokiniana, Wheat seed

Location: Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh

Start Date: 00-11-2007

End Date: 00-03-2008

Program Area: Pest Management

Commodity: Diseases, Wheat

Objectives:

To determine the effect of different levels of black pointed seed on germination potential and subsequent disease severity of the crop.

Methodology:

The experiment was conducted in a field of Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh during November 2007 to March 2008. Wheat seeds variety Kanchan were collected from the University farm and divided into seven groups. Each group was considered as a treatment. The treatments were T₀ = The best seeds (apparently healthy seed) treated with vitavax- 200 (0.2% of seed weight), T₁ = The seeds containing 3% black pointed seed, T₂ = The seeds containing 6% black pointed seed, T₃ = The seeds containing 10% black pointed seed, T₄ = The seeds containing 15% black pointed seed, T₅= The seeds containing 20% black pointed seed and T₆ = The seeds containing 25% black pointed seed. The experimental plot was prepared with ploughing and cross ploughing. The soil was fertilized with Urea, Triple Super Phosphate (TSP), Muriate of Potash (MOP), Gypsum for N, P, K and S, respectively at 220, 132, 68 and 125 kg/ha. The experiment was laid out in the Randomized Complete Block Design (RCBD) having four replications (plots) for each treatment. Each plot size was 2.5 m x 1.2 m. Six gram seed of wheat (120 kg /ha) was sown at 3 cm depth in a 2.5 m row maintaining 20 ern distance between rows. Weeding, irrigation and other intercultural operations were done properly as needed. Data on seedling emergence and plant population per square meter were recorded at 7 and 15 days after sowing. Severity of Bipolaris leaf blight was recorded as percent diseased leaf area (%DLA) of the flag leaf (F) and penultimate leaf F-I) of 10 tillers selected randomly in each plot. The disease severity (percent diseased leaf area) was recorded 5 times, starting from first initiation of disease (booting stage) and ending at grain dough stage at an interval of four days by using a 0-7 scale. Where, 0 = Leaf free from lesion, 1 = Few isolated lesions covering not more then 1 % leaf area, 2 = 5% leaf area covered, 3 = 10 % leaf area covered, 4 = 25 % leaf area blighted, 5 = 50 % leaf area blighted, 6 = 75% leaf area blighted and 7 = Severe infection with more 80 % leaf area damaged.

Source of Information: Journal of Science Technology (Dinajpur) Vol. 8: 135-141 (2010), ISSN 1994-0386

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Considering the findings of the research it has been concluded that the wheat seed having without or less black point infection affords good results in seedling emergence and minimum diseased condition in the field.

Knowledge Management: Journal