Diseases of crops.

Agricultural science for S.S.S 2 Second Term.

Week 5   

Diseases of crops.

Performance objectives,

Students should be able to;

1. State the meaning of diseases.
2. List the effect of diseases on crop production.
3. Name the important diseases of major crops.
4. State the causes’ organism disease.
5. State the preventive and control measures.

Content.  

Meaning of Disease.

A disease is a departure from a normal state of health, presenting marked symptoms or outward visible signs. A disease is also defined as a condition of disorder in the functioning of the tissues of an organism.

It is an unfavourable condition caused by infections by pathogens or deficiency or excess of some environmental factors which result in physiological and anatomical dysfunctions expressed in…