CO 1, Panchamukhi and Satamukhi (Kovvur), Sree Pallavi, Sree Rashmi, Sree Kiran.
It comes up well in loamy soils with a pH range of 5.5-7.0 and a combination of warm and moist climate with a mean temperature of 21-27 degree celsius . It can be grown up to 1500 m elevation with well distributed rainfall of about 1000 mm during growth period. In areas
where rainfall is less, a good amount of supplementary irrigation is required for successful production.
Under field condtions, 5-10 per cent of the seed tubers fail to sprout. To overcome this situation, about 2000-3000 corms / cormels per hectare may be planted in a nursery at a close spacing so that sprouted tubers from the nursery can be used for gap filling.
Once in a week
Apply 25 tonnes of FYM, 20 kg N, 30 kg P and 60 kg K/ha as basal and 20 kg N, 30kg P and 60 kg K/ha 45 days after planting
Spray Dimethoate 0.05%.
Mealy bugs and scale insects
Dip corms in Dimethoate 0.05% solution for 10 minutes
Leaf blight (Phytophthora colocasiae):
Oval or irregular purplish or brownish necrotic lesions with watersoaked periphery appear on leaves. In severe cases, the entire leaf lamina and the petioles are affected giving a blighted appearance and collapse of the plant. Heavy incidence causes up to 50 per cent crop loss.
Use of field resistant varieties viz., Muktakeshi and Jankhri, early planting to avoid heavy monsoon rains, use of healthy planting materials, removal of self-grown colocasia plants, spray with fungicides viz., Mancozeb (0.2%) or metalaxyl+ mancozeb @ 2 g/l of water and treating the seed tubers with biocontrol agents viz., Trichoderma viride
8 – 10 t/ha in 180 days.