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Time CalendarThursday, July 20,2017

Diseases

Common diseases:

Leaf Blotch (Taphrina maculens)

Nature:

This fungus produces brownish yellow spots on both surfaces of the leaf, though the upper surface has more of them. Although the plants are not killed, leaves gradually wither and lead to a heavy reduction in yields.

Control:

Bordeaux mixture (5:5:50) or any non metallic fungicides

Spray Carbandazim (1g/lt) or Mancozeb (2.5g/lit)

Sandovit 3 4 times

Soft rot or rhizome rot (Phythium graminicolum)

Nature:

This disease extends from the collar zone to the rhizome, causing discoloration and gradual decomposition of the rhizome. The roots also get affected.

Control:

- Raise beds and sow healthy rhizomes

- Bordeaux mixture (5:5:50)

- Healthy turmeric seed rhizomes dipped in hexacap (captan) 0.2 % and brassical (quintazene) 0.5% lowers incidence and germination was markedly enhanced

- Drench soil with Mancozeb (2.5g/l) solution

Leaf spot Anthracnose (Collectotrichum capici)

Nature:

Irregular spots are present on the plant and concentric circles appear on the leaves.

Control:

- Bordeaux mixture (5:5:50)

- Spray Dithane M-45 @ 3g/l of water or Bavastin @ 1g/l

Nematodes (Meloidogyne incognita)

Nature:

This disease leaves the plants stunted in growth. Leaves turn yellow and there is a marginal tip drying of leaves. This can also lead to rotting of the roots. Plants die prematurely and leave a poor crop harvest. Infested rhizomes lose their bright colour.

Radopholus similies

Nature

The infected plants age and dry faster than healthy plants. The infested rhizomes are a yolk-yellow in colour and give out a shallow, water soaked appearance on the surface. Roots rot and most of the decayed roots are devoid of cortex and stylar portions.

Control:

Thimet @ 10-15 kg/ha or Phorate 10kg/ha at the time of field preparation or

Aldicarb and Carbofuran (1-3 kg a.i/ha), 3 weeks after planting controls infestation

Notes:

The Kodudur and Chayapasupu are resistant to root knot nematodes Other nematodes include Longidorus elongates, Xiphinema elongatum, Hopolaimus seinhorstii, Heliocotylechus multicinctus, Tylenchorhycus martini, Pratylenchus delaratti and Rotylenchulus reniformis.