Monday, 23 February 2015

Controlling rhizome rot in ginger

Rhizome rot, also called soft rot, is one of the most devastating diseases of ginger. Initial symptoms of the disease appear as light yellowing of leaf tips which gradually spread down to the leaf blade and leaf sheath along the margin.
During early stages, the middle portion of the lamina remains green while the margin turns yellow. Subsequently the yellowing spreads to all leaves followed by drooping, withering and drying. Infected shoot can be easily pulled out from the soil.
Management practices

Use of healthy rhizome is one of the most important preventive measures.
Cultivars such as Maran, Nadiya and Narasapattom are reported to be resistant to this infestation.
Water-logging in the field must be avoided. A raised bed of 30 cm height and 1m width is recommended. Provide proper drainage and keep land free from weeds at all times.
Collect the diseased material as and when the disease is noticed and burn them. Plan early planting during April. Crop rotation with non- host crops like leguminous crops, maize, ragi, paddy will not only benefit the soil nutrient supplementation but also keep the diseases under check.
Seed rhizome dip treatment with Trichoderma harzianum l0 gm per litre of cow dung slurry, before sowing is effective. One per cent of bordeaux mixture spray just after extraction is also effective.
Drenching the seeds with bordeaux mixture in 25 litres of water dissolved in six kg of copper sulphate solution and again after germination at 2-3 weeks interval gives partial control.
Seed treatment

Rhizomes treated with (Trichoderma bio-control agent) at rate of 5gm / kg of rhizome for 30 minutes proves effective. Application of Trichoderma bio-control agent (2.5 kg mixed with 50 kg FYM) 10-15 days before sowing and oil cakes making are recommended.
Soil drenching with Mancozeb (0.3 per cent) or Metalaxyl at 500 ppm is recommended in epidemic disease areas.
(Dr. Anup Das, Senior Scientist (Agronomy), Division of Natural Resource Management, ICAR Research Complex for NEH region, Umiam - 793 103, Meghalaya, mobile: 09436336070 and Dr. Utpal Dey, ICAR Mob: 8119934883, email: utpaldey86@gmail.com)

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