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Subject: Plant Pathology × Author: Sunil A.Kulkarni × End date: 2009 × Start date: 2009 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Epidemiology and integrated management of Anthracnose of greengram
    (UAS Dharwad, 2009) Sunil A.Kulkarni; V.I.Benagi
    major diseases of greengram. Survey work revealed that, the disease severity was found more in Bidar (49.43%) and least in Bijapur (23.86%) districts. The observations on loss estimation revealed that comparatively lower disease index and maximum BCR was recorded in plots receiving two sprays of carbendazim. The average grain yield loss of 40.18% and stalk yield loss of 46.90% was noticed due to anthracnose in unsprayed plots. The maximum mycelial weight was observed after 15 days of incubation. Solid medium like potato dextrose agar, liquid medium like Richard’s medium, temperature of 300C, RH of 95%, pH 6.5 and alternate cycles of light and darkness were found best for the growth and sporulation of C. truncatum. The spore load was maximum during last week of July and first week of August. The correlation studies between spore load, PDI and weather parameters indicated a negative correlation with temperature, while positively correlated with relative humidity and rainfall. The greengram crop sown on 4th June showed least disease severity. C. truncatum was survived upto 360 days in infected seeds and also in infected leaves stored under freeze condition. The flowering stage was found susceptible to the disease development. In host range studies only blackgram and horsegram had shown infection. The genotypes TM-96-2 and TARM-18 were found resistant to anthracnose. Further, comparatively lesser sugar and higher phenol content were observed in these varieties than in susceptible variety. In vitro evaluation revealed that, propiconazole, carbendazim, thiophanate methyl, benomyl, hexaconazole and carbendazim + mancozeb were found effective. Among botanicals azadirachtin was effective. Among bioagents and ITKs Trichoderma harzianum and cow urine respectively were most effective. In the management study hexaconazole was found to be effective in control of the anthracnose with maximum BCR