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Symptoms Nematode damage is frequently not suspected until roots and pods are examined. Galls (like swellings) form on roots, pegs, and pods of infected.

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Presentation on theme: "Symptoms Nematode damage is frequently not suspected until roots and pods are examined. Galls (like swellings) form on roots, pegs, and pods of infected."— Presentation transcript:

1 Symptoms Nematode damage is frequently not suspected until roots and pods are examined. Galls (like swellings) form on roots, pegs, and pods of infected plants. These galls reach a diameter. Root development is commonly reduced. Virtual Academy for the Semi Arid Tropics Lesson 1: Root-Knot Course on Diseases of Groundnut Module VI: Diseases Caused by Nematodes

2 Virtual Academy for the Semi Arid Tropics Lesson 1: Root-Knot Course on Diseases of Groundnut Module VI: Diseases Caused by Nematodes Symptoms Pods also become infected and develop knots, or small warts (Figs.). Pegs and pods occasionally begin to deteriorate at maturity. Severely infected plants are stunted and have chlorotic leaves.

3 Virtual Academy for the Semi Arid Tropics Lesson 1: Root-Knot Course on Diseases of Groundnut Module VI: Diseases Caused by Nematodes Management Root-Knot nematode populations are reduced in the absence of a host plant. Hence, crop rotation with poor or immune host crops like sorghum or pearl millet will reduce its population and thus its effect on groundnut plants. Similarly, good weed control should be practiced as many weed species act as hosts for root-knot nematodes.

4 Virtual Academy for the Semi Arid Tropics Lesson 1: Root-Knot Course on Diseases of Groundnut Module VI: Diseases Caused by Nematodes Management Soil treatment with nematicides before planting will limit the damage caused by these nematodes. A few nematicides can also be applied after planting. These chemicals are relatively expensive and require costly equipment for the application.

5 With this, the Lesson 1 on Root-Knot disease in groundnut concludes. Next, Lesson 2 is about Root-Lesion disease in groundnut. Select Lesson 2 in Module VI contents Virtual Academy for the Semi Arid Tropics Course on Diseases of Groundnut Module VI: Diseases Caused by Nematodes

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