International Journal of Plant Protection

Gowdra Nagamma ¹, Muhammad Saifulla ², S. Pavithra ¹, S. R. Suresh ³

Affiliations
1 Department of Plant Pathology, University of Agricultural Sciences, GKVK, BENGALURU (KARNATAKA), IN
2 AICRP on Chickpea, Zonal Agricultural Research Station, (UAS, GKVK), BENGALURU (KARNATAKA), IN
3 Department of Plant Pathology, University of Agricultural Sciences, DHARWAD (KARNATAKA), IN

Abstract

To find out the best sources of nutrients for the fungal growth, different solid media were tested. Maximum radial growth was recorded on PDA and Czapek's agar with mean colony diameter of 90mm and on par with each other compared to other media tested. Carrot agar recorded maximum number of sclerotial production (48 per microscopic field) followed by PDA (46 per microscopic field) and the minimum sclerotial production was observed in Czapek's agar (39.33 per microscopic field). PDA and carrot media supported good mycelial growth and sclerotia production. The maximum sclerotial size was observed in PDA (0.5×0.4 μm) whereas Czapek's agar recorded minimum size of sclerotia (0.3×0.2 μm). Ellipsoidal shape of sclerotia was observed in Czapek's agar whereas, irregular shaped sclerotia were observed in other media. Maximum dry mycelial weight was recorded eighth day of incubation (150mg).

Keywords

Chickpea, Macrophomina phaseolina, Sclerotia, Solid Media.

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Deepa ¹, Gururaj Sunkad ¹, M. R. Govindappa ¹, M. K. Naik ¹, S. R. Suresh ²

Affiliations
1 Department of Plant Pathology, University of Agricultural Sciences, RAICHUR (KARNATAKA), IN
2 Department of Plant Pathology, University of Agricultural Sciences, DHARWAD (KARNATAKA), IN

Abstract

An experiment was carried out to assess the crop loss due to sunflower leaf curl virus (SuLCV) disease. The crop loss assessment in terms of growth and yield components was recorded at first appearance of symptoms of SuLCV at 30 days to 90 days during the crop growth. The SuLCV disease infection in sunflower significantly affected the plant height (72.60 to 157cm), size of the head (8.60 to 18.78cm), 100 seed weight (2.20 to 6.32g), oil content (31.24% to 38.26%), and weight of seeds/10 heads (77.20 to 372.2g) as compared to the healthy control plants. In the plants, first appearance of symptoms at 30 DAS was recorded the seed yield loss of 79.25 per cent.

Keywords

Sunflower, SuLCV, Yield Loss Estimation, Yield Components.

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