![]() ![]() Objectives: This work was accompanied to find an alternative to chemical fungicides and to screen tomato varieties against Alternaria solani. Introduction: Early blight is a common disease of tomato, which is caused by Alternaria solani. Some plants and plants products were found to be useful in controlling Alternaria infection. For controlling the diseases a number of new chemicals were synthesized and evaluated and so also the biological control agent including bacteria, Actinomycetes and fungi. Beside these pathogenic infections are reported due to A. alternata (with a few morphological differences) usually infect members of these three vegetable providing families. was found to be associated with various Angiospermic families but A. These crops inflicted serious damage as a early blight diseases caused by fungal pathogen Alternaria spp. apples, broccoli, cauliflower, carrots, potatoes, Chinese cabbage, tomatoes, bok choy, citrus and many plants used as ornamentals and a no. Diseases caused by Alternaria species are common and are worldwide in their occurrence. Farmers bear heavy yield losses both in their quality and quantify of these crops due to various diseases. Vegetables belonging to family Cucurbitaceae, Brassicaceae and Solanaceae are important due to their nutritional and have also cost-effective values. All the treatments significantly reduced both incidence and intensity of the disease over untreated control. indica) as against 36.37 per cent in untreated control. Rest of the treatments recorded average disease intensity in the range of 13.00 % (Mancozeb 75 WP) to 25.77 % (A. Similarly, significantly least average disease intensity was recorded with the treatment Hexaconazole 5 EC (7.38 %), followed by Propiconazole 25 EC (9.07 %) and Carbendazim 25% + Mancozeb 50 % WS (11.31 %). indica) as against 45.75 % in untreated control. Rest of the treatments recorded average disease incidence in the range of 23.00 % (Mancozeb 75 WP) to 38.00 % (A. Amongst all the treatments significantly least average disease incidence was recorded with the treatment Hexaconazole 5 EC (16.12 %), followed by Propiconazole 25 EC (18.75 %) and Carbendazim 25% + Mancozeb 50 % WS (21.16 %). Results revealed that all the treatments significantly reduced the leaf spot incidence and intensity, over untreated control. Therefore, the present investigation attempted to manage Alternaria leaf spot disease with the integration of effective fungicides, botanicals and bioagents. The pathogen/ disease is very difficult to manage alone with fungicides. botrytis) vegetable crop, causing qualitative as well as quantitative losses. is one of the most destructive diseases of the cauliflower (Brassica oleracea var. viride (66.35%).Īlternaria leaf spot caused by Alternaria brassicae (Berk.) Sacc. harzianum was found most effective inhibiting mycelial growth 71.15% followed by T. solani followed by multineem (58.49%), Neem excel (48.92%) and Repellent plus (38.00%) at the mean of two concentration (1000 & 1500 ppm). Among neem formulations, neem oil (71.91%) was found effective inhibiting mycelial growth of A. To avoid relying solely on chemicals and to identify a viable alternative component, five neem formulations and four bio-inoculants were evaluated by Poison Food Technique and Dual Culture Technique in the lab in the year of 2020-21 against A. Use of fungicides for the management of disease in crop puts a large number of negative health and environmental effects therefore, the urgent need for a more sustainable and ecological approach to manage disease without fungicides. Alternaria solani cause early blight of tomato and it is considered weed of field because of its wide adaptability under different environment. The first signs of mite presence are the curling and bronzing of the lower leaves of the stem.Early blight disease is painful nerve to tomato growing farmer because it causes huge economic loss to the farmer every year. The small size of the mites makes monitoring difficult. Since the mite cannot be seen, the symptoms are easily confused with diseases. Damage can develop very rapidly, and the mites can kill plants in a few days in dry hot weather. ![]() Damage to the plant typically begins near the ground and spreads upwards. The plants can drop their leaves, especially in hot weather. Attacked leaves and stems develop a greasy appearance and turn bronzed. They feed on all above-ground parts of the tomato plant, causing spotting, twisting or folding of leaves and fine cracks on the fruits. They prefer high temperatures and low humidity. They complete the lifecycle in 1 week this explains the rapid increase of this mite in tomato fields. They have a ringed conical body with the head and two pairs of legs at the large end. They are very tiny, approximately 0.2 mm long, and cannot be seen with the naked eye.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |