Agricultural Science·Plant production · NSSCO 3.3.2
Crop diseases & their control
Narrated lesson · press play
You plant good seed, the rains come, the maize grows tall and green — and then the plants begin to sicken, wilt and die. That sickness is a plant disease. In this lesson we meet the three groups of pathogens — bacteria, fungi and viruses — then study one disease from each group in depth: bacterial wilt, maize and sorghum smut, and maize streak virus, learning for each one how it infects, the harm it does, and how a careful Namibian farmer prevents and controls it.
What you'll learn in this lesson
By the end you should be able to (NSSCO Agricultural Science 3.3.2):
- Describe the mode of infection, harmful effects, prevention and control of one bacterial plant disease (bacterial wilt, bacterial blight or black rot)
- Describe the mode of infection, harmful effects, prevention and control of one fungal plant disease (damping off of seedlings, downy mildew, or maize and sorghum smut)
- Describe the mode of infection, harmful effects, prevention and control of one viral plant disease (mosaic on sorghum, maize streak, or groundnut rosette)
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