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Articles by Anuja Gupta
Total Records ( 3 ) for Anuja Gupta
  Anuja Gupta , S.N. Sinha and S.S. Atwal
  An experiment was conducted during 2006-2009 to study whether modified atmosphere with varying carbon dioxide concentration can protect seed from fungal infestation. Lower CO2 concentration upto 40% was ineffective in the control of seed mycoflora, however high concentrations of carbon dioxide reduced fungal incidence but none of the carbon dioxide concentrations tested, completely controlled fungal infestation in paddy seed or rice grain. CO2 at 60-80% concentrations (v/v) reduced the incidence of storage fungi viz., Curvularia lunata, Cladosporium sp., Rhizopus stolonifer and Alternaria alternata on stored paddy seed. But 80% CO2 was required to control Aspergillus flavus, an aflatoxin producing fungi. Modified atmosphere with oxygen at 5% concentration resulted in higher incidence of storage fungi (52.0%) as compared to 48.0% in basmati rice exposed to modified atmosphere with 2% O2 concentrations and with CO2 concentrations varying from 0-20%.
  Ravindra Kumar , Anuja Gupta , V.K. Maheshwari and S.S. Atwal
  Rice (Oryza sativa L.) is one of the major food crops of the world. Due to lack of awareness, the farmers do not distinguish the seed from grain and hence the quality of farmers saved seed remains below standard. This seed carries microflora which play an important role in reducing the seed viability. Among seed microflora, fungal load on the seed is very important. In this study, seed samples of different varieties of paddy were collected from farmers in different villages of Haryana from 2002 to 2012. The seed was subjected to seed health test by blotter technique and observed under stereo-binocular microscope to assess its fungal load. The per cent germination and vigour index were also evaluated by paper towel method. A total of 30 fungi belonging to different groups were recorded from the samples of farmers’ saved seed. Alternaria padwickii (28.52%), Curvularia lunata (22.67%), Alternaria alternata (10.51%), Rhizopus stolonifer (8.96%), Aspergillus flavus (8.26%) and Fusarium moniliforme (7.15%) were recorded as major fungi associated with the seed. However, in breeder seed of different paddy varieties grown at this station, only 22 fungal species belonging to different groups were recorded. Out of which Alternaria padwickii (10.62%), Curvularia lunata (7.35%), Alternaria alternata (6.54%), Aspergillus flavus (6.07%) and Rhizopus stolonifer (5.21%) were recorded as the major fungi associated with this seed. Average per cent germination and vigour of farmers’ saved seed of different paddy varieties was significantly lower than the breeder seed of different varieties of paddy grown at this station.
  Anuja Gupta , Ravindra Kumar and V.K. Maheshwari
  Bakanae disease of rice caused by Fusarium fujikuroi is widespread in all rice growing countries of the world and is of great concern especially in Basmati paddy. Different management practices viz. seed treatments, seedling dip treatments and soil amendments were integrated for the management of bakanae disease in Paddy variety Pusa Basmati 1121. Seed treatment with carbendazim (Bavistin) and Trichoderma viride gave 22.7 and 11.4% control of the disease. However, the disease incidence did not vary much amongst different seed treatments under FYM+T. viride treated soil conditions. Seed treatment with bavistin and T. viride gave 10.1 and 10.2% disease, respectively as against 10.3% in crop grown from untreated seed under FYM+T. viride soil condition. Seedling dip in 0.2% bavistin or 0.4% T. viride solution before transplanting significantly reduced the disease incidence. Seedling dip treatments with bavistin and T. viride solutions resulted in 55.5 and 34.5% control of the disease, respectively, irrespective of soil amendments. The disease incidence was 10.3 and 11.8% in FYM+T. viride treated soil and T. viride treated soil, respectively as against 13.6% in untreated soil. The highest disease incidence (27.3%) was recorded in non-amended soils (control) transplanted from nursery of untreated seeds and the seedlings dipped in plain water at the time of transplanting. The disease control in FYM+T. viride treated soil and T. viride treated soil was statistically at par and significantly superior to untreated soil. The grain yield in plots transplanted from all the seed treatment and seedling dip treatment were statistically superior to plots transplanted from nursery raised from untreated seed and seedling dipped in plain water.
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