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Effect of Seed Treatment and Foliar Spray with Fungicides in Controlling Black Point Disease of Wheat

P. K. MALAKER
Senior Scientific Officer, Wheat Research Centre, BARI, Dinajpur-5200,

I. H. MIAN
Professor, BSMRAU, Gazipur-1706, Bangladesh.

Abstract/ Executive Summary:

The efficacy of seed treatment and foliar spray with fungicides in controlling black point incidence of wheat seeds was evaluated in the field. Two seed treating fungicides, namely Vitavax-200 and Homai-80WP were used @ 0.25% of dry seed weight and foliar spray with Tilt-250EC (0.05%) was applied in six different schedules. Untreated and unsprayed controls were also maintained. Seed treatment with either Vitavax-200 or Homai-80WP significantly increased plant population and grain yield. but none of them was found effective in reducing black point incidence. On the other hand, foliar sprays with Tilt-250EC under all the spray schedules except spraying at 70 and 90 DAS significantly minimized the disease severity over unsprayed control. Among the different spray schedules, spraying at 30, 40, 50, 60, 70, 80, and 90 DAS appeared to be most effective, which was similar to spraying at 30, 45, 60, 75, and 90 DAS in reducing black point incidence and increasing grain yield. Economic analysis on yield advantage showed that the highest additional gross margin of Tk. 6120/ha with BCR 2.57 was obtained from five sprays applied at 30, 45, 60, 75, and 90 DAS. .

Keywords: Seed treatment, Foliar spray, Black point, Wheat.

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur

Start Date: 00-00-1999

End Date: 00-00-2000

Program Area: Pest Management

Commodity: Wheat

Objectives:

To determine the effectiveness of seed treatment and different schedules of foliar spray with fungicides in reducing black point incidence of wheat seeds under field condition.

Methodology:

The experiment was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur, during 1999-2000 crop season. The seeds of a susceptible variety 'Kanchan' were collected from BARI and treated separately with two seed treating fungicides, namely Vitavax-200 (Carboxin 37.5% + Thiram 37.5%) and Homai80WP (Thiophanate methyl 50% + Thiram 30%) at the rate of 2.5 glkg of dry seed weight. As foliar spray, Tilt- 250EC (Propiconazole) at 0.05% concentration of the formulated product was applied under six different spray schedules viz., i) 30, 50, 70, and 90 days after sowing (DAS); ii) 30, 45, 60, 75, and 90 DAS; iii) 30, 40, 50, 60, 70, 80, and 90 DAS; iv) 70 and 90 DAS; v) 60, 75, and 90 DAS; and vi) 60, 70, 80, and 90 DAS. Untreated and unsprayed controls were also maintained. The land was prepared using a tractor driven disc plough, rotavator, and harrow. Well decomposed cowdung was applied at the rate of 10 tlha. Urea, TSP, MP, and gypsum were used at the rate of 220, 132, 68, and 125 kg/ha, respectively. Full doses of TSP, MP, and gypsum and two-thirds urea were applied during final land preparation. The rest one-third urea was applied as top dress after 20 days of sowing. The experiment was laid out in split-plot design with three replications. Seed treatment was assigned in the main plots and foliar spray in the sub-plots. The unit plot size was 2m x 3m. Plot to plot and block to block distances were 1.0 m and 1.5 m, respectively. The seeds were sown at the rate of 120 kg/ha in continuous manner with 20 em row spacing. Weeding was done twice at 25 and 45 DAS. Irrigation were applied at 20, 42, 63, and 80 DAS.

Source of Information: Bangladesh J . Agril. Res. 34(3): 425-434, September 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Seed treatment with either Vitavax-200 or Homai-80WP significantly increased plant population and grain yield. but none of them was found effective in reducing black point incidence. On the other hand, foliar sprays with Tilt-250EC under all the spray schedules except spraying at 70 and 90 DAS significantly minimized the disease severity over unsprayed control. Among the different spray schedules, spraying at 30, 40, 50, 60, 70, 80, and 90 DAS appeared to be most effective, which was similar to spraying at 30, 45, 60, 75, and 90 DAS in reducing black point incidence and increasing grain yield. Economic analysis on yield advantage showed that the highest additional gross margin of Tk. 6120/ha with BCR 2.57 was obtained from five sprays applied at 30, 45, 60, 75, and 90 DAS.

Knowledge Management: Journal