Disease Control
Akopọ
Crop diseases are caused by tiny living things you cannot see without a microscope: bacteria, fungi and viruses. A single infected plant left in a field can become the source that spreads disease to a whole crop, turning a healthy harvest into a failure. Knowing what causes a disease, how it gets into the plant and how it spreads is the key to stopping it.
In this lesson you will study one named disease from each group: a bacterial disease, a fungal disease and a viral disease. For each you will learn how it infects the plant, the harm it does, and how it can be prevented and controlled. You will also meet the idea of the disease triangle, which explains why removing any one of three things, the pathogen, a susceptible crop or the right conditions, can stop a disease in its tracks.
Awọn Afojusun
- (a) describe the mode of infection, harmful effects, prevention and control of one named plant disease from each of the following groups: • bacterial diseases • fungal diseases • viral diseases.
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Disease Control. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Which conditions are most likely to encourage fungal diseases? A. Dry and cool B. Dry and warm C. Wet and cool D. Wet and warm Answer: D
- Maize streak virus is spread from plant to plant by: A. Rain splash B. Leafhoppers C. The wind alone D. Contaminated tools Answer: B
- Cassava bacterial blight is caused by a: A. Virus B. Fungus C. Bacterium D. Nematode Answer: C
- The most effective way to control a viral disease of a crop is usually to: A. Spray a fungicide B. Grow resistant varieties and control the insect carrier C. Add more fertiliser D. Water the crop more often Answer: B
- Which practice helps control a fungal disease by keeping the crop drier? A. Closer spacing of plants B. Flooding the field C. Wider spacing and good drainage D. Leaving infected plants in place Answer: C
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Disease Control? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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