The main reason of this disease is the necrotrophic fungus Alternaria solani Ellis and Martin is one of the very important foliar diseases of tomato. Among them, the most common disease of tomato is early blight. There are many types of diseases of tomato. Among these type of diseases, early blight of tomato is one of the most significant and destructive diseases in the country. However, their fruit destruction as well as the expansion of the disease are some of the complications which can be very serious. In the field, flea beetles, aphids, leaf miners, stink bugs, and fruit worms cause minimal damage to the foliage. Among them, Aphids, flea beetles, leaf miners, and spider mites threaten young plant-bed tomatoes. Tomato cultivation is also damaged by a number of other major factors after the primary rise till harvest. Theses viruses cause viral diseases which decrease plant vigor and reduce yield potential of the fruit to a considerable extent. Tomato Mosaic Virus (ToMV) the most important tomato virus follows by, Tomato Leaf Curl Virus (TLCV), Curly Top Virus (CTV), Tomato Yellows Top Virus (TYTV) and Cucumber Mosaic Virus (CMV). The main obstruction in our country in the production of tomato is a number of pathogens including fungi, virus as well as bacteria. It also includes a numbers of very tasty and nutritional food, such as tomato puree, ketchup, full peeled, juices, sauces as well as soups. Tomato is the primary ingredient to produce delicious food. It is a vegetable as well as fruit which succeeded popularity in the last century. Tomato is the most popular and the best vegetable in Bangladesh. solani, it was revealed that BARI Tomato-9 had the highest Percentage of Disease Index (PDI) and the leaf of BARI Tomato-7 had the lowest Percentage of Disease Index (PDI).īangladeshi people earn their living from agriculture. After screening the five tomato varieties against A. Tall 25EC was the most effective fungicide against Alternaria solani followed by Mancozeb 80WP. The efficacy of five fungicides viz., Bavistin 50WP, Mancozeb 80WP, Indofil M-45, Sulcox 50WP and Tall 25EC were evaluated for their fungitoxicity against the A. Allium sativum was the most effective one against A. Ocimujm sanctum (L), Allium sativum (L), Datura metal (Linn) and Zingiber officinale (Rose) were selected to evaluate their in vitro efficacy of 5%, 10% and 20% concentration against the A. Six plant extracts viz., Adhatoda vasica (Nees), Azadirachta indica (A Juss). viride also showed highest inhibition in volatile and non-volatile trials. viride was most effective in the reduction process of A. was tested by dual culture, volatile as well as non-volatile method. Antagonistic capacity of the Trichoderma spp. harzianum collected form NAMDEC and Trichoderma sp collected from field of BCSIR was monitored as optimum P H. The growth of the test fungi Trichoderma spp. Alternaria solani was identified as the infectious fungus.
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