EPIDEMIOLOGY AND MANAGEMENT OF EARLY BLIGHT IN POTATO CAUSED BY Alternaria alternata L.

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dc.contributor.advisorYadav, D. L.
dc.contributor.authorHADA, RITIKA
dc.date.accessioned2021-12-06T06:45:38Z
dc.date.available2021-12-06T06:45:38Z
dc.date.issued2021-09-09
dc.descriptionEpidemiology and management of early blight in potato caused by Alternaria alternate L.en_US
dc.description.abstractEarly blight caused by Alternaria alternata is a destructive disease which causes heavy losses in tuber yield of potato in South Eastern Rajasthan. Surveys were conducted to determine the incidence of early blight in Kota, Baran and Bundi districts of South-Eastern Rajasthan and revealed that disease incidence was ranged from 12.5 to 23.8 per cent. The maximum disease incidence was recorded in Anta village of Baran district 23.8 per cent while, minimum was recorded in Suvana and Keshoraipatan village of Kota and Bundi district 12.5 per cent. A field experiment was conducted to assess the progress of early blight disease intensity as influenced by three planting dates and four varities. The four varities i.e. Kufri Bahar, Kufri Sindhuri, Kufri Pukhraj and Kufri Pushkar were planted at every fifteen days interval i.e. 23rd Oct, 6th Nov and 20th, Nov, 2019, respectively. Out of three planting dates, minimum disease intensity was recorded with 2nd date of planting (6th Nov, 2019) in K. Sindhuri (8.5 %) followed by K. Pushkar (11.5 %), K. Bahar (21.5 %) and K. Pukhraj (30.0 %) as compared to 1st (23rd Oct, 2019) and 3rd (20th Nov, 2019) date of planting. Minimum per cent disease intensity of early blight was recorded in variety K. Sindhuri (12.5 %) and K. Pushkar (13.5 %). Epidemiological studies revealed that maximum and minimum temperature was highly significant with negative correlation. The yield data indicated that planting on 6th November i.e. 2nd date of planting produced maximum total number of tubers per plot, marketable yield and total tuber yield (t/ha) and among the varieties maximum total tuber yield and marketable yield were obtained i.e. 16.7, 18.2, 14.9, 17.3 and 14.3, 16.9, 13.7, 15.6 t/ha in K. Bahar, K. Sindhuri, K. Pukhraj and K. Pushkar, respectively. Hence, first week of November i.e. 2nd date of planting could be considered as an effective to minimize early blight disease of potato in Kota zone of Rajasthan. Fungicide, Azoxystrobin 23 % SC @ 2 ml/lit per 20 kg of tuber seed treatment combined with two foliar spray of Azoxystrobin 23 % SC @ 1 ml/lit was recorded maximum per cent disease control (76.49 %), minimum per cent intensity (6.62 %) with better dry matter (22.6 %), total number of tubers (548.00 per plot), tuber yield (25.67 t/ha), marketable yield (21.93 t/ha) with highest net gain of Rs. 67,620. Among bio-agents i.e. Trichoderma viride @ 8 g/lit per 20 kg of tuber treatment combined with two foliar spray of T. viride @ 5 g/lit of water was showed maximum per cent disease control (65.48 %), minimum per cent intensity (9.27 %) with superior dry matter (22.3 %), total number of tubers (485.33 per plot), total yield (22.47 t/ha) and marketable yield (19.10 t/ha) with highest net gain of Rs. 47,712. Hence, the chemical fungicide Azoxystrobin was found more effective in managing the disease but due to continuous and irrational use of these chemicals, pathogens have developed resistance against the fungicides and also aid in environmental pollution and toxicity in the produce whereas, bio-agents are naturally occurring living organisms, which are found in rhizosphere, phylloplane, etc. These bio-agents help in not only managing the diseases but also increasing the crop yield. Hence, application of T. viride @ 8 g/lit per 20 kg of tuber treatment combined with two foliar spray of T. viride @ 5 g/lit of water could be used in the management of early blight in potato.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810178650
dc.keywordsPOTATOen_US
dc.language.isoEnglishen_US
dc.pages104en_US
dc.publisherCOLLEGE OF AGRICULTURE, UMMEDGANJ, KOTAen_US
dc.research.problemEPIDEMIOLOGY AND MANAGEMENT OF EARLY BLIGHT IN POTATO CAUSED BY Alternaria alternata L.en_US
dc.subPlant Pathologyen_US
dc.themeEPIDEMIOLOGY AND MANAGEMENT OF EARLY BLIGHT IN POTATO CAUSED BY Alternaria alternata L.en_US
dc.these.typeM.Scen_US
dc.titleEPIDEMIOLOGY AND MANAGEMENT OF EARLY BLIGHT IN POTATO CAUSED BY Alternaria alternata L.en_US
dc.typeThesisen_US
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