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Birsa Agricultural University, Ranchi

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19991
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Subject: Plant Physiology × End date: 2018 ×
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    ThesisItemOpen Access
    Collar Rot of Pea And Its Integrated Management
    (Birsa Agricultural University, Ranchi, 1999) Deepak Kumar; S.C.Dubey
    Collar rot of pea (Pisum sativum L) is a destructive disease caused by Fusarium solani f. sp. pisi. Disease incidence varied from 26.3 to 53.3 per cent in different localities of Ranchi. The characteristic rotting symptom was observed on collar region, root and nodal areas of stem of diseased seedlings as well as adult plants. The pathogen was isolated purified and identified by standard methods. The pathogen satisfied Koch's pastulate test. Among 10 cultivars only one i.e. VL-3 showed moderately resistant reactions against the disease. Late sowing minimized the disease incidence. The sowing in second fortnight of November showed minimum disease development with satisfactory stand of the crop. Temperature 9.1 to 26.4°C, relative humidity 18.6 to 93.1 per cent and rainfall 0 to 21.3 mm favoured for maximum disease development in nature during 18th to 25th December when the crop attained the age of 48 to 55 days: The maximum temperature and maximum relative humidity were significantly positively correlated whereas minimum relative humidity was significantly negatively correlated with disease development. Maximum temperature and maximum relative humidity showed significant positive effect on disease development in nature and accounted more than 54 and 56 per cent variations in disease incidence during 1997-98 and 1998-99, respectively. Local isolate of Gliocladium virens and Trichoderma harzianum showed superiority over other isolate, of antagonists in respect of inhibition of mycelial growth of the pathogen through dual culture and production of volatile and non-volatile substances. Benlate, Bavistin and Captaf inhibited cent per cent growth of the pathogen. Captaf. Thiram and Vitavax were selected for integration with T. harzianum and G. virens as they inhibited the growth of pathogen but not so against antagonists. Trichoderma harzianum showed maximum inhibition zone/growth around the treated seed followed by G. virens alone. Thiram + G virens, Vitavax + G. virens Captaf+ G. virens and Captaf + T harzianum which were statistically at par. The integration of fungicides with biocontrolling agents gave good protection to germinating seeds than the fungicides alone in laboratory condition. The seed treated with Captaf (1g/kg) + T. harzianum (10 spore/ ml/10g seed) gave good germination, least diesease incidence along with maximum pod yield which was statistically at par with seed treated with T. harzianum alone. Thiram + T harzianum. Vitavax + G. virens and G. virens alone. Among fungicides Captaf, Vitavax.