Tundu. Quit frequently the ear-cockle nematode is associated with a bacterium (Corynebacterium michiganense var tritici) causing a disease a called Tundu or yellow year rot. This disease is characterized by presence of bright yellow slime or gum in the emerging inflorescence, stem and leaves. The best control of tundu or yellow ear rot disease, caused by Corynebacterium tritici, was given by seed + soil treatment with aldicarb sulfone or soil treatment. the treatments that caused the highest incidence of tundu disease. Introduction. Ear-cockle disease caused by Anguina tritici is an important disease of wheat in.


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Yellow ear rot/Tundu- Bacterial disease of wheat

Heads and necks frequently emerge as a distorted, sticky mass. At an earlier stage, leaves may wrinkle or twist as they emerge from the bacteria-laden whorl. When dry, the exudate appears as white flecks on the heads and upper leaf surfaces.

Affected seedlings are stunted. The bacterial mass is fluid during wet weather, but hard and dry when relative humidity is low and dew is sparse.

The dry, hardened exudate mechanically distorts the leaves, heads and necks, tundu disease of wheat inhibits or prevents elongation. tundu disease of wheat

Tundu Disease of Wheat: Symptoms and Management | Plant Pathology

Symptoms of seed-gall nematode Tundu disease of wheat tritici are normal in this disease; these include stunting, wrinkled, twisted leaves and the replacement of kernels by galls. Two types of galls have been observed in India; those with bacterial ooze on the surface and those without Paruthi et al.

Prevention and control Introduction Galls of Tundu disease of wheat. A number of techniques may be used to remove the galls from seed lots including cultural and sanitary methods fanning, screening and flotation in waterchemical treatment, and physical methods hot water treatment and mechnical separation.


Cultural and Sanitary Control Various methods have been used to separate nematode galls, which are essential for the expression of tundu in wheat, from seed lots. These include fanning, screening and flotation in water.

However, none of these methods are as effective as a brine treatment in which sound wheat kernels sink while galls, light kernels and debris float Tundu disease of wheat and Mukhopadhaya, This disease was first reported by Hutchinson from Punjab tundu disease of wheat India and is now known to occur in many countries of the world including China, Australia, Cyprus, Canada, Egypt, Pakistan, Brazil, and so on.

Yellow ear rot/Tundu- Bacterial disease of wheat | agropedia

In India, the disease has been recorded from Punjab, Haryana, western U. It has been studied by Vasudeva and Hingorani and Sabet and later confirmed by many that the infection by bacteria occurs only when they are in association with nematodes, Anguina tritici, in the soil.

It has been presumed that the association with nematodes is essential for infection by the bacteria as the nematodes mechanically transmit the bacteria. Tundu disease of wheat to it, the nematodes can cause ear crockle disease by their own the bacteria need not be associated with them.

Symptoms of Tundu Disease: The early symptoms of tundu disease are wrinkling of lower and twisting of the middle leaves generally evident when the crop is tundu disease of wheat maturity. This is followed by curling and twisting of spikes.

What happens actually is that a bright yellow sticky slime exudes mainly from the ear and envelops it.


In addition, the slime trickles down to glumes, stem, and leaf sheaths and tundu disease of wheat them. The slimy substance becomes deeper yellow, hard, and dry in dry weather resulting in retardation of plant growth and distortion of stem and ear.

  • Some investigations on the control of ear cockle/tundu disease of wheat.
  • Tundu Disease of Wheat: Symptoms and Management | Plant Pathology
  • Tundu | agropedia
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Causal Organism of Tundu Disease: The bacterium is rod-shaped, motile with one polar flagellum, Gram- positive, tundu disease of wheat measures x 1. Colonies developed on agar media are bright yellow primarily then turning to orange, round, convex, with entire margin, moist, glistening, opaque in centre, and opalescent at edges.

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