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Impact of Tomato Spotted Wilt Virus (tswv) on Yield Contributing Characters of Eight Tomato Varieties Under Field Condition

A. A. Farooq
MS student
Plant Pathology Division, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur- 1706

A. M. Akanda
Professor
Plant Pathology Division, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur- 1706

D. Islam
MS student
Plant Pathology Division, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur- 1706

Abstract/ Executive Summary:

An attempt was made to evaluate the performance of eight tomato varieties namely BARI-T1 (Manik), BARI-T2 (Ratan), BARI-T3, BARI-T7 (Apurba), BARI-T8 (Shila), BARI-T9 (Lalima), BINA-T1 and BINA-T2 against Tomato spotted wilt virus (TSWV) under field condition. The study was conducted at the experimental farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during November 2005 to March 2006. Irrespective of tomato varieties and stages of infections, TSWV significantly (p=0.05) reduced the yield contributing characters of tomato plants as compared to healthy ones. Significantly higher percent of reduction to all the selected seven yield contributing parameters was observed when plants were infected with TSWV at early stage of infection as compared to mid and late stages. In consideration of yield contributing characters BARI-T9 seemed to perform better in comparison to other varieties when infected with TSWV.

Keywords: Tomato Spotted Wilt Virus, impact, yield contributing characters

Location: The research farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur

Start Date: 00-11-2005

End Date: 00-03-2006

Program Area: Pest Management

Commodity: Tomato

Objectives:

To determine the status of eight tomato varieties against the virus.

Methodology:

The field experiment was conducted at the research farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during November 2005 to March 2006. The soil of the experimental field belongs to Salna series under the Agroecological Zone (AEZ)-28: Madhupur Tract. The texture of the soil was silty clay in surface layer and silty clay loam in subsurface (Rahman et al. 1998). The pH of the soil was 6 to 6.5.Eight tomato varieties namely BARI Tomato-1/Manik (BARI-T1),BARI Tomato-2/Ratan (BARI-T2),BARI Tomato-3 (BARI-T3), BARI Tomato-7/Apurba (BARI-T7), BARI Tomato-8/Shila (BARI-T8), BARI Tomato-9/Lalima (BARI- T9), BINA Tomato-1 (BINA-T1) and BINA Tomato-2 (BINA-T2)were used in the experiment. The seeds of these tomato varieties were collected from Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur and Plant pathology Division, Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh. After well prepared of the nursery bed the seeds of eight tomato varieties were sown on November 17, 2005. Proper care was taken to ensure good and healthy seedling development. The experimental field was ploughed and leveled to have a good tilth on December 2, 2005. Fertilizer dose was used as N-200 (applied in two splits, one at 21 and other at 35 days after transplanting), P₂O₅-100, K₂O-150, S-20 and B-2 kg/ha. Cow dung (5 t/ha) and all the fertilizers except urea were applied during final land preparation. The experiment was laid out following 8 x 2 x 3 factorial in Randomized Complete Block Design with 4 replications. The seedlings of eight tomato varieties grown in open nursery bed were carefully uprooted and transplanted in the main field on December 17, 2005. Forty-eight seedlings of each variety were transplanted in 3 m x 10 m unit plot maintaining 70 x 70 cm² spacing. Intercultural operations were done as and when required. Tomato spotted wilt virus was identified on the basis of field symptoms and Single-Stranded Conformational Polymorphism (SSCP). The data on the yield contributing characters of tomato plants were collected at three stages of the plant growth as early (transplanting to first flowering), mid (first flowering to first fruiting) and late stage (first harvesting to last harvesting).To fiend out the affect of TSWV infection on different yield contributing characters of tomato, data were noted at early, mid and late stages of the crop as described earlier. The selected yield contributing characters were 1) no. of bunches per plant, 2) no. of flowers per plant, 3) no. of fruits per plant, 4) fruit length (cm), 5) fruit girth (cm), 6) leaf chlorophyll and 7) fruit yield (g/plant). The data were analyzed statistically using the analysis of variance (ANOVA) of MSTAT-C software for proper interpretation. Incase of yield data the mean values were compared by Duncan’s multiple range test (DMRT) at 5% level of significance. The correlation regression between percent reductions of yield contributing characters and percent reduction of yield due to TSWV infection were performed by correlation and regression model. Percent reductions of the yield contributing characters were calculated following the under mentioned formula. All the parameters expressed per plant basis unless it is otherwise stated.

Source of Information: Int. J. Sustain. Crop Prod. 2(2):1-9, 2007

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Early stage infection of TSWV caused severe reduction of yield contributing characters of all the eight tomato varieties followed by mid and late stage infection though reduction of individual parameter varied depending on the tomato varieties. Correlation regression analysis revealed that all the yield contributing characters were highly significant and positively correlated with the yield reduction of tomato.

Knowledge Management: Journal