~ 2992 ~ International Journal of Chemical Studies 2021; 9(1): 2992-2995 P-ISSN: 2349–8528 E-ISSN: 2321–4902 www.chemijournal.com IJCS 2021; 9(1): 2992-2995 © 2021 IJCS Received: 18-10-2020 Accepted: 30-11-2020 Bhavik K Patel Main Cotton Research Station MCRS, Navsari Agricultural University (NAU), Surat, Gujarat, India Prashant B Sandipan Main Cotton Research Station (MCRS), Navsari Agricultural University (NAU), Surat, Gujarat, India SK Chawada Krishi Vigyan Kendra, Navsari Agricultural University (NAU), Surat, Gujarat, India RK Patel Krishi Vigyan Kendra, Navsari Agricultural University (NAU), Surat, Gujarat, India Corresponding Author: Bhavik K Patel Main Cotton Research Station MCRS, Navsari Agricultural University (NAU), Surat, Gujarat, India Evaluation of various combi product fungicides for the control of wilt (FOV) disease of cotton under in vitro condition of south Gujarat (India) Bhavik K Patel, Prashant B Sandipan, SK Chawada and RK Patel DOI: https://doi.org/10.22271/chemi.2021.v9.i1ap.11683 Abstract In this experiment, different districts of South Gujarat were closely examined for the presence of wilt disease in different cultivars/ Bt hybrids during the crop season to know the current scenario of wilt disease. The respective FOV wilt pathogen was purified, identified and isolated. Here, different combi fungicides were tested for their effect on the growth of Fusarium oxysporum f. sp. vasinfectum (FOV) using poisoned food technique. The technique involves cultivation of test organism on a medium containing the test chemicals. In this experiment, PDA was used as basal medium. Six combination products of fungicides were evaluated at three different concentrations by poisoned food technique for evaluating their efficacy against the Fusarium oxysporum f. sp. vasinfectum. Among them, combination products of fungicides, carbendazim 12% + mancozeb 63% significantly inhibited the growth of the Fusarium oxysporum f. sp. vasinfectum and proved strongly fungitoxic in nature. Keywords: Cotton, wilt, disease, fungicide Introduction Cotton (Gossypium spp.) is one of the most important fiber crops playing a key role in economic and social scenario of the globe. It is also known as "THE WHITE GOLD" or "THE KING OF FIBERS". It is oldest among the commercial crops of the world providing fiber for clothing of the mankind. Cotton is an important fiber yielding crop of global importance, which is grown in tropical and subtropical regions of more than 80 countries of the world. The major cotton producing countries are USA, China, India, Pakistan, Uzbekistan, Egypt, Argentina, Australia, Greece, Brazil and Turkey. In total global cotton production 70 per cent cotton production comes from the four countries, which includes China (27%), India (22%), USA (13%) and Pakistan (8%). For many developing and underdeveloped countries cotton export is the main source of foreign exchange earnings. The cotton crop is affected by plenteous pests, diseases and weeds etc. causing solemn economic losses in a crop. In the post Bt cotton era (2002 onwards) sucking pests like Aphids, Jassids, Thrips, Whitefly, Mealybugs, Myrid bugs and Mites continue to ravage the cotton crop and pose a serious threat to sustain and enhance cotton productivity (Tanweer, 2013) [6] . The wilt disease is responsible for serious losses to the crop in the central and western India on a large scale and on almost all the cultivated varieties of both G. arboreum and G. herbaceum, the two indigenous species, especially in black cotton soils of Maharashtra, Madhya Pradesh, Karnataka and Gujarat. At present the most of cultivated cultivars are susceptible to wilt disease (Fusarium oxysporum f. sp. vasinfectum) and caused 54-60% yield loss (Anon., 2003) [1] because of reduced stand, stunted growth, small bolls and poor lint quality. The symptoms of Fusarium oxysporum f. sp. vasinfectum is both seed borne and soil borne and colonizes the roots and vascular system of susceptible cotton cultivars, causing root and vascular discoloration, wilting and sometimes death of the plant (Chen et al. 1985, Hillocks, 1992 and Davis et al., 1996) [2, 4, 3] . Looking to the frequent occurrence in one or other region and inflicting serious damage under South Gujarat region. Hence, the present investigation was undertaken to clarify deeply and thoroughly the wilt disease in these districts.