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Efficacy of Sedomil 72 Wp and Recozeb 80 Wp in Controlling Red Rust of Tea

M. S. ISLAM
Division of Plant Pathology, Bangladesh Tea Research Institute (BTRI), Srimangal- 3210, Bangladesh.

M. ALI
Division of Plant Pathology, Bangladesh Tea Research Institute (BTRI), Srimangal- 3210, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted for two years to find out the efficacy of two fungicides Sedomil 72 WP (Mancozeb) and Recozeb 80 WP (Mancozeb + Metalaxyl) @ 1, 1.5, 2.0, and 2.5 kg/ha in controlling red rust disease (Cephaleuros parasiticus) of tea. in both the years, Sedomil 72 WP and Recozeb 80 WP inhibited disease severity and disease progress. Among the treatments, the highest reduction in PDI was obtained with 2.5 kg/ha of the both fungicides. During 2008, Sedomil 72 WP showed 93.28% and Recozeb 80 WP showed 91.04% efficacy with the dose of 2.5 kg/ha of both fungicides, while it was 91.40% of both with same dose during 2009. In case of the dose of 2.0 kg/ha of both the fungicides caused disease reduction more than 80%, which is significantly similar to the dose of 2.5 kg/ha. Decreasing trend in disease infection was observed from the spray to final sprays of both the fungicides for all doses. The overall result suggests that the use of Sedomil 72 WP or Recozeb 80 WP may provide an economic advantage alone with 2.0 kg/ha.

Keywords: Efficacy of Sedomil 72 WP, Recozeb 80 WP, red rust of tea

Location: Bangladesh Tea Research Institute (BTRI), Srimangal

Start Date: 00-00-2008

End Date: 00-00-2009

Program Area: Pest Management

Commodity: Tea

Objectives:

To find out the optimum dose (s) of the two fungicides in controlling the disease.

Methodology:

The field experiment was conducted at the main experimental farm of Bangladesh Tea Research Institute (BTRI) during 200$ and 2009. Two fungicides, namely Sedomil 72 WP (Mancozeb) and Recozeb 80 WP (Mancozeb + Metalaxyl) each with four doses constitute the treatments. The fungicides were applied 1.0. 1.5, 2.0, and 2.5 kg/ha. The control plots were sprayed similarly with plain water. The unit plot size was 7.15 m. × 4.2 m. The disease was allowed to develop naturally. After first monsoon, when typical symptom of the disease was observed, the treatments were applied to the experimental units. The fungicides were mixed with water (1000 t/ha) and applied directly to the stem and branches of the tea bushes. The fungicides were applied four times at 15 days interval starting from the appearance of the disease. The experiment was laid out in a Complete Randomized Block Design (RCBD) with three replications. Weeding, application of insecticides, tipping and other necessary intercultural operations were done as and when required. Disease incidence was recorded at 7 days after fungicidal application following 0-5 scale (Martins et al., 1988). Infection (%) means the intensity of sporulation of the algae appeared on the stem and branches. The severity of the disease was expressed in percent disease index (PDI), which was computed following a standard formula as described below (Singh, 2000). Percent Disease Index (PDI) = ( Sum of all disease ratings/Total number of ratings x maximum disease rating ) × 100. Data were subjected to analyses by MSTAT computer programme. Mean separation was done by DMRT.

Source of Information: Bangladesh J. Agril. Res. 36(2) : 279-284, June 2011, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The overall result suggests that the use of Sedomil 72 WP and Recozeb 80 WP @ 2.5 kg/ha and 2.0 kg/ha are equally effective in controlling the disease. 2.0 kg/ha of both the fungicides may be recommended against the red rust disease of tea.

Knowledge Management: Journal