Basic 5 Lesson Note for PVS – Agricultural Science

Topic: Control of Crop Weeds, Pests and Diseases – Definition of Diseases in Plants

Plant disease is a dynamic process where a living or nonliving entity interferes with the normal functions of a plant over a period of time. This causes abnormal health conditions in plants and affects their normal physiological functions.

Just like animals, plant diseases can be classified as infectious and non-infectious.

Infectious Diseases are diseases that can spread from one plant to another. These diseases are caused by particles called viruses and tiny living things (bacterials) called mycoplasmas. Diseases may also be caused by fungi, and worms. Plants that live on or inside other plants may also cause disease.

Noninfectious Diseases are the diseases that cannot be spread from one plant to another. However, these diseases are a major cause of poor health in plants. They are often caused by conditions in the environment. Minerals in the soil, such as nitrogen, phosphorus, or iron, are important for plant growth. If there are not enough minerals in the soil, plant growth can slow down. 

Class Work/Fun: State two classes of plant diseases you know

Home Work/Fun: What are plant diseases?

Instructional Materials: Pictures, Videos.

Conclusion: The teacher concludes the lesson by going over it and summarizing it appropriately.