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Tomato Leaf Curl Disease Development and Its Management with Sticky Yellow Trap

F. Begum
MS student
Department of Plant Pathology and Seed Science, Sylhet Agricultural University, Sylhet-3100.

N. Jahan
MS student
Department of Plant Pathology and Seed Science, Sylhet Agricultural University, Sylhet-3100.

A. Muqit
Professor
Department of Plant Pathology and Seed Science, Sylhet Agricultural University, Sylhet-3100.

M.A.U. Doullah
Professor
Department of Plant Pathology and Seed Science, Sylhet Agricultural University, Sylhet-3100.

Abstract/ Executive Summary:

To elucidate the pattern of tomato leaf curl disease development and assess the efficacy sticky yellow trap an experiment was conducted in the net house of the Department of Plant Pathology, Sylhet Agricultural University, Syhlet during December 2017 to May 2018. Disease progress pattern varied significantly in control and the plants where trap was used. Disease was first appeared at two weeks after transplanting and reached the highest level after 4 weeks. At the initial stage only upper two leaves were infected and showed disease symptom which covered around 8.7% of the foliage. After two weeks disease incidence rose to 29.8% and after 4 weeks symptoms were observed in the whole plant. Mainly three types of insects: aphid, whitefly and thrips were captured on the trap. Employing of sticky traps delayed leaf curl incidence by two weeks and reduced the disease incidence by 31%. Yield was increased significantly due to application of yellow sticky trap.

Keywords: Tomato, Leaf curl, Sticky trap, Whitefly

Location: Plant Pathology and Seed Science Department, Sylhet Agricultural University, Sylhet

Start Date: 00-12-2017

End Date: 00-05-2018

Program Area: Pest Management

Commodity: Diseases, Tomato

Objectives:

This study was conducted to know the pattern of leaf curl disease development and to assess the efficacy of yellow sticky trap for leaf curl disease management.

Methodology:

Experimental site- The pot experiment was carried out at the net house of Plant Pathology and Seed Science Department, Sylhet Agricultural University, Sylhet during December 2017 to May 2018. Experimental materials- Tomato variety Ratan (BARI Tomato-2) was used in the experiment. Twelve inch diameter earthen pots were used. Pot mixture was prepared by mixing cowdung, urea and TSP and MOP with soil. Seeds were sown in a pot in the first week of December 2017. Three week old seedlings were transplanted on first week of January 2018. One seedling was transplanted in each pot. Customized yellow sticky traps were used for insect trapping due to unavailability of commercial yellow sticky traps in the market. To make one sticky paper trap four inch by six inch yellow colored art paper was cut and wrapped with transparent scotch tape so that the sticky part remains outside. This card was tied with a one meter long bamboo stick which was used to support each tomato plant in each pot. The cards were replaced after two weeks. Traps were used in fifteen pots and another fifteen pots were used as control. Irrigation was given with a watering can as and when needed. Data Collection- Data collection was started at 15 days after transplanting (15DAT) of seedlings. Data were collected once in a week. Data on disease reaction and disease incidence, yield etc were collected in different growth stages. Disease diagnosis- Leaf curl disease was identified through visual observation of symptoms like upward curling, slight yellowing of leaves, smaller leaflets and stunting of the plants as suggested by Green and Kalloo (1994). Disease incidence Disease incidence was calculated with the following formula Disease incidence (%) = Number of plants infected/Total number of plants observed. Statistical analysis Fifteen pots were used for each treatment and in each pot contained only one plant. In total thirty pots were used. Paired plot technique was used for comparing the observed data. The data obtained for different characters were statistically analyzed with Microsoft XL.

Source of Information: Int. J. Expt. Agric. 10(2):16-21(July 2020)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Tomato leaf curl disease progress pattern indicates that disease starts to appear 2 weeks after transplanting and it takes another 4 weeks to reach up to peak. In case of disease progress in individual plant, it takes 5 weeks to spread the symptom to entire plant after initiation. Results of the present study indicated that sticky yellow traps can be effective to capture whitefly and reduce tomato leaf disease incidence. However it needs to be verified in larger plots in the field in couple of seasons.

Knowledge Management: Journal