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Efficacy of Fungicides for Controlling Early Blight of Tomato

R. Islam
Plant Pathology Division, Bangladesh Agricultural Research Institute Joydebpur, Gazipur-1701, Bangladesh.

Kawser-E- Jahan
Plant Pathology Division, Bangladesh Agricultural Research Institute Joydebpur, Gazipur-1701, Bangladesh.

S. Ali
Plant Pathology Division, Bangladesh Agricultural Research Institute Joydebpur, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Eight fungicides namely Pipertax 50WP (Copper Oxychloride), Mancothane 80WP (Mancozeb), Meena 80WP (Mancozeb), Sazid 70WP (Mancozeb + Metalaxyl 7%), Media 80WP (Mancozeb), Win 77WP (Copper Hydroxide), Bicozeb 80WP (Mancozeb) and Rovral 50WP (Iprodion) were tested for their effectiveness against early blight (Alternaria solani) of tomato (Lycopersicon esculentum). The fungicides were applied as foliar spray at the rate 0.2% suspension in water for 4 times at 12 days interval starting from first appearance of symptoms. All the fungicides significantly reduced disease severity and increased fruit yield and yield components compared to control. Among the fungicides tested, the highest disease reduction with maximum fruit yield and yield components were obtained with Bicozeb, which was similar to Rovral as a standard check. Reduction of disease severity (PDI) and increase of fruit yield in different farms by Bicozeb ranged 58-70% and 27-49% respectively. Rovral also gave 58-70% disease reduction and 27-57% yield increase. Other fungicides reduced disease severity by 44-69% and increase in fruit yield by 4-44% over control.

Keywords: Fungicide, Early blight, Tomato, Control

Location: Central Research Farms of Bangladesh Agricultural Research Institute (BARI), Gazipur and RegionalAgricultural Research Station (RARS), BARI, Rangpur

Start Date: 00-00-2006

End Date: 00-00-2007

Program Area: Pest Management

Commodity: Tomato

Objectives:

To evaluate the effectiveness of eight newly imported fungicides against early blight of tomato.

Methodology:

The fungicides tested in the present investigation were Pipertax 50WP (Copper Oxychloride), Mancothane 80WP (Mancozeb), Meena 80WP (Mancozeb), Sazid 70WP (Mancozeb + Metalaxyl 7%), Media 80WP (Mancozeb), Win 77WP (Copper Hydroxide), Bicozeb 80WP (Mancozeb) and Rovral 50WP (Iprodion). There were altogether nine treatments including a control (plain water). Rovral 50WP was included as a standardThe fungicides were applied as foliar spray at 0.2% suspension in water. Spraying was started immediately after the onset of disease and a total of four sprays were applied at an interval of 12 days. The experiment was conducted at the Central Research Farms of Bangladesh Agricultural Research Institute (BARI), Gazipur and Regional Agricultural Research Station (RARS), BARI, Rangpur during the winter season of 2006-2007. Cultivation procedures of tomato and doses of manure and fertilizers were the same as recommended by BARI (Razzaque et al. 2000). The unit plot size was 2.0 m x 1.2 m and line-to-line and plant-to-plant distances were 60 cm and 40 cm, respectively. Distance between blocks and between plots was 1.0 m. The experiment was laid out in a randomized complete block design with 3 replications. Fifty-centimeter wide and 30-cm deep drain was made surrounding each block to facilitate irrigation and drainage. Four weeks old seedlings of variety BARI Tomato-2 (Ratan) were transplanted in the field on 9 November in Rangpur and 20 November in Gazipur. Ten seedlings were transplanted in each plot in two rows. Intercultural operations such as weeding, irrigation and mulching were done as and when necessary. Insect infestation was controlled by spraying Malathion 57 EC @ 0.15%. Blight severity was recorded on a 0-5 scale from five plants selected randomly in each plot after 7 days of last spray and percent disease index (PDI) was calculated according to Meah (1994). Mature fruits were picked once or twice in a week and fruit number and fruit weight 0 per plant were recorded. Fruit yield was expressed in ton per hectare. Plant height (cm) was recorded at the end of the crop period. All data were analyzed for ANOVA and means of the treatments were compared using MSTAT-C computer program.

Source of Information: Bangladesh J. Plant Pathol. Vol. 28 (1&2): 25-27.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results of the present study reveal that all the fungicides tested were effective to control early blight and improve plant growth and fruit yield of tomato. Among the fungicides, Rovral and Bicozeb provided better disease control and higher fruit yields compared to other fungicides.

Knowledge Management: Journal