Eco. Env. & Cons. 28 (December Suppl. Issue) : 2022; pp. (S47-S52) Copyright@ EM International ISSN 0971–765X The efficacy of various fungicides against tomato Fusarium wilt (Fusarium oxysporum f. sp. lycopersici) Dipen Dholu, Poonam P. Shete, Yuvraj G. Kasal* and Pansuriya Dhaval Department of Plant Pathology, School of Agriculture Lovely Professional University, Phagwara 144 411, Punjab, India * College of Horticulture, Maharana Pratap Horticultural University, Karnal, Haryana (Received 2 June, 2022; Accepted 24 August, 2022) ABSTRACT The tomato is one of the most popular vegetables farmed worldwide. One of the most harmful tomato disease is Fusarium wilt, which is a disease that the fungus Fusarium oxysporum f.sp. lycopersici causes. Disease causes about 30% to 40% losses in yield. The poisoned food technique was used to assess the fungi- toxic activity of the fungicides Blitox 50, Aliette, Roko, Amistar, Avtar, and Cabrio Top at the plant pathology department of the college of agriculture at LPU, Punjab, throughout the years 2021-2022. Six different fungicides were tested in the lab at various concentrations such as 50, 100, and 150 ppm. Thiophanate Methyl (Roko) show the best result in laboratory. Same fungicides were checked at field. Among this fungicides Copper Oxychloride (Blitox 50) shows the best result in field condition. Key words: Tomato, Fusarium wilt, In-vitro, In-vivo, Fungicide, Control. Introduction The second-most significant crop in the world after potatoes is the tomato (Solanum lycopersicum Mill.). It originated in tropical America and is now one of the most widely grown Solanaceous vegetables world- wide (Thompson and Kelly, 1957). In India 2019-20, the tomato was cultivated in 818 thousand ha area and its production was 205.50 Lakh tonnes. The largest production was in Andhra Pradesh (2667.43 thousand tonnes); Madhya Pradesh (2655.29 thou- sand tonnes); Karnataka (2163 thousand tonnes); Tamil Nadu (1592.31 thousand tonnes); Gujarat (1378.78 thousand tonnes) (Indian horticulture data- base 2020). In many regions, tomatoes are affected by a number of diseases brought on by nematodes, viruses, bacteria, fungi, and other organisms (Mark et al., 2006). Fusarium wilt is a prevalent tomato dis- ease that affects both greenhouse and field -grown tomatoes worldwide (Amini et al., 2010; Abdel- Monaim, 2012). According to Mui-Yun (2003), the pathogen is soil-borne and may survive in contami- nated soil for up to ten years. Temperatures of 28 °C in the soil and air are perfect for infection. The pathogen will expand into the lower sections of the stem if soil temperatures are optimal but air tem- peratures are not, but the plants will not show any visible symptoms. Agrios (1988) discovered thatchlamydospores, macroconidia andmicroconidia are the three forms of asexual spores produced by Fusarium oxysporum. Gerlach and Nirenberg, (1982) and Upadhyay and Rai, 1987 investigated the details of Fusarium oxysporum f. sp. lycopersici. Macro-conidia are fusi- form, hyaline, with two to three septates and mea- suring 2.5-3.3 x 3.5-5.5 μ. Microconidia are one celled, hyaline, ovoid to ellipsoidal, and range in size from 2.5- 4 x 6-15 μ. Chlamydospores develop DOI No.: http://doi.org/10.53550/EEC.2022.v28i08s.008