Plant Diseases: Control and Management

This section covers the topic of all Plant Diseases and measures of their Control and Management. This page will be updated on regular basis with the basic information of different plant disease and measures of treatment. Let’s start…………..

1. Soft Rot of Tomato

Distribustion: All over the world.

Host Plant-crops: Potato, sweet potato, banana etc.

Cause: the soft rot of tomato is caused by the bacteria. It is mainly Ervinia sp.


  • Watery patches on the surface of fruit and other tender portion of plants.
  • Unwanted smell.
  • Rotting occurs in extreme cases.

Mode of Attack

  • Physical contact between infected and healthy plants.
  • Vector insects such as flies.

Life Cycle of Disease:

The causing agent of the disease live inside affected fruit and other parts of plant. The bacteria uses host plant for the completion of life cycle.

Control Measures

  • Take sanitary action during harvesting. Manually don’t spread the disease.
  • Don’t plant tomato with other host plant.
  • Perform seed treatment using 2% carbendazim. For 2%, mix 2g of carbendazim in 1kg of tomato seed.

2. Bacterial Wilt of Tomato

Distribution: All over the world. Most active in Asian countries.

Host Plant-crops: Potato, Woody nightshade etc.

Cause: the bacterial wilt of tomato is also caused by the bacteria. Scientifically it is known as Burkholderia solnacearum.


  • Sudden wilting of young plants.
  • Scorching appearance of plant’s leave.
  • The longtitunal cut of stem shows the black-brown vascular.
  • The size of fruit is stunted.

Mode of Attack or Disease Transmission

  • The pathogen enters through wound in healthy plants.
  • It is soil born disease.

Life Cycle of the Disease

  • The pathogen of bacterial lives in plant residual.
  • Wild host such as woody nightshade.
  • It can survive in water during unfavorable weather.
  • Prefer relatively low to medium temperature.
  • Without proper management the pathogen find its home in field and starts life cycle in favorable condition.


  • The plants of tomato are very sensitive to nematodes. They make wound in plant root. The control measures of nematode in the soil should be done first.
  • Crop rotation will be effective. Crop rotation of cowpea-corn-cole crops is recommended.
  • Seed treatment with 2% bavistin is done.

3. Root Knot of Tomato

Distribution: Tomato growing regions.

Gall formation caused by Meloidogyne incognita

Cause: The root knot of tomato is caused by Meloidogyne incognita, commonly known as root knot nematode.

Host Plant: Tomato, brinjal, chillies etc.

Mode of Action

  • Generally infection is done by the 2nd stage larvae.
  • The larvae penetrate through the plant root.
  • Larvae starts feeding inside the root triggering the formation of gall like structure.


  • Plants become stunted.
  • Galls on plant’s root.
  • Unhealthy leaves with plant cloratic.
  • Overall production reduced.

Life Cycle of Pathogen: The nematode complete it’s life cycle in soil and plant debris.

Control and Management

  • Affected plants should be discarded at nursery stage.
  • Grow marigold between major crop row. Marigold attracts nematode and prevents main crop.
  • Apply biopesticide like pseudomonas.
  • Use resistant varieties.

Last Updated: 28-03-2021.

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2 years ago

Nice information