Crop Diseases Caused By Nematodes

 Crop Diseases Caused By Nematodes :






Nematodes are parasitizing plants roundworms, which usually cannot be seen without special equipment. They live in the soil, and therefore mainly affect roots, tubers, and bulbs. There are over 4100 dangerous nematode species.


Symptoms Of Nematode Crop Diseases :

Essentially, nematodes feed by sucking juices from plants. Because of this, plants affected by these parasites often appear dried out, as if they are suffering from drought. Other symptoms are also similar:

  • yellowing;
  • growth retardation;
  • lack of response to fertilizers and water;
  • the gradual general decline of a plant;
  • reduction or even destruction of root systems.

Although nematodes need a long period to cause significant damage to a plant, they spread exceptionally rapidly. Therefore, farmers should identify crop disease in the field to save the affected plants timely and prevent the disease from spreading.


Common Nematode Diseases :

Diseases directly depend on the type of nematodes:


Fusiform thickening of the stems is provoked by stem worms. The disease is expressed in the deformation of leaves, swelling of petioles, and the appearance of dark spots on tubers.




Aphelenchoides, a disease of rice, is provoked by Aphelenchoides besseyi. Disease marks are blemishes on the tops of leaves, lack of grains, and culture depletion. The corresponding nematode


Tylenchulus semipenetrans cause serious citrus diseases. It is characterized by the gradual death of not only leaves but also branches.


Control Measures :

Parasite control involves a wide range of activities. In particular, crop rotation, improving crop disease resistance, and soil treatment with appropriate fumigants with nematicides are effective measures. You can also destroy nematodes and their eggs with hot water (about 50°C/120°F). However, this method of controlling crop diseases requires accuracy. You should adjust the watering time according to the temperature to not harm the plants themselves. Measures that promote plant growth are practical against individual nematodes: heavy mulch, fertigation, watering in drought, and summer and autumn fallow.

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