What you'll learn

• (a) Succession:
• (i) Meaning of succession
• (ii) Structural changes in species composition, variety and increase in number.
• (iii) Primary succession - in an aquatic habitat, - in a terrestrial habitat.
• (iv) Secondary succession - meaning and examples.
• (v) Characteristics of a stable community.
• Definition of pests
• Classification of pest by; (i) the part they attack- (stem borers, root feeders, leaf feeders, young shoot feeders, plant and seed feeders) (ii) their animal type - (invertebrate pests, e.g. Nematodes, Arthropods, locusts, grasshoppers, coleopteran, Lepidoptera larvae of butterflies).
• Life cycles of pests.
• Control of pests.
• (b) Diseases caused by pest-and their agents:
• (i) Fungal diseases (e.g. Blight, root rot and mildew)
• (ii) Viral diseases (e.g. mosaic, molting, stunting)
• (iii) Bacterial diseases (e.g. bacterial wilt, leaf spot, soft rot).