Systems for control of the weeds in indeterminate tomatoes (Solanum lycopersicum L.)
Nikolina Shopova
, Mariyan Yanev
Abstract: Tomatoes are a major vegetable crop of significant economic value. The effective weed control has a key role in the growth, development, and productivity of tomato plants. This study aims to investigate a weed control system for tomatoes through the use of herbicides. In 2020-2021, on the experimental field of Agricultural University – Plovdiv, Bulgaria, a field experiment with the tomato variety Opal F1, was performed. The experiment was performed by randomized block design in four replicates. The experience variants include: 1. Untreated control - without the use of herbicides and without hoeing; 2. Economic control - timely removal of weeds by hoeing, without the application of herbicides; 3. Dual Gold 960 EC (960 g/l s-metolachlor) + Targa Super 5 EC (50 g/l quizalofop-p-ethyl) in rates of 1.20 l ha-1 + 1.75 l ha-1; 4. Dual Gold 960 EC + Sencor 70 WG (700 g/kg metribuzin) in rates of 1.20 l ha-1 + 0.60 g ha-1 ; 5. Stomp New 330 EC (330 g/l pendimethalin) + Targa Super 5 EC in rates of 4.00 l ha-1 + 1.75 l ha-1 ; 6. Stomp New 330 EC + Sencor 70 WG in rates of 4.00 l ha-1 + 0.60 g ha-1. The dominant weeds in the field were Portulaca oleracea L. and Amaranthus retroflexus L. Apart from them, there were also Solanum nigrum L., Sonchus oleraceus L., Sorghum halepense (L.) Pers. developed from rhyzomes, etc. Under experimental conditions, application of the Stomp New 330 EC (4.00 l ha-1) + Sencor 70 WG (0.60 g ha-1) system showed the highest efficacy against Portulaca oleracea L. - 87.5%, Amaranthus retroflexus L. - 80.0%, Solanum nigrum L. - 75.0%, and Sonchus oleraceus L. - 80.0%. High efficacy against these weeds was also reported at the Dual Gold 960 EC (1.20 l ha-1) + Sencor 70 WG (0.60 g ha-1). Аt the variant with Dual Gold 960 EC (1.20 l ha-1) + Targa Super 5 EC (1.75 l ha-1) and Stomp New 330 EC (4.00 l ha-1) + Targa Super 5 EC (1.75 l ha-1) was reported оne hundred percent efficacy against Setaria viridis (L.) P.Beauv. Highest herbicidal efficacy against Sorghum halepense (L.) Pers. developed from rhizomes - 98.8% was reported after treatment with Stomp New 330 EC + Targa Super 5 EC. In the conditions of experience, the highest yield of tomatoes, Opal F1, was received at Economic control - 6702.5 kg da-1, followed by Stomp New 330 EC + Sencor 70 WG - 6530.3 kg da-1, and Dual Gold 960 EC + Sencor 70 WG - 6262.5 kg da-1. There is no statistically proven difference in yield between Economic control, Stomp New 330 EC + Sencor 70 WG, and Dual Gold 960 EC + Sencor 70 WG.
Keywords: efficacy; herbicides; tomatoеs; weeds; yield
Citation: Shopova, N. & Yanev, M. (2025). Systems for control of the weeds in indeterminate tomatoes (Solanum lycopersicum L.). Bulg. J. Agric. Sci.,31(4), 718–730.
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| Date published: 2025-08-27
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