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This is the complete lecture note for CPS 404 Advance Crop Protection. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: CPS 404 Course title: Advance Crop Protection Course credit load: 2 Units Series 1: Practical Identification of Crop Pests and Disease Pathogens Outline Part 1.1: Introduction to crop pests and disease pathogens Sub-Part 1.1.1: Definition and importance of crop pests Sub-Part 1.1.2: Definition and importance of disease pathogens Sub-Part 1.1.3: Impact of pests and pathogens on crop production Part 1.2: Identification of insect pests in the field Sub-Part 1.2.1: Common insect pests of major crops Sub-Part 1.2.2: Field characteristics used for identification Sub-Part 1.2.3: Practical methods for recognising insect damage Part 1.3: Identification of disease pathogens in the field Sub-Part 1.3.1: Common fungal, bacterial, and viral pathogens Sub-Part 1.3.2: Visible symptoms and diagnostic features Sub-Part 1.3.3: Practical methods for recognising disease spread Part 1.4: Field diagnostic techniques and recording Sub-Part 1.4.1: Tools and aids for field identification Sub-Part 1.4.2: Recording and reporting observations Sub-Part 1.4.3: Importance of accurate diagnosis for crop protection Introduction
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Crop pests and disease pathogens are among the most significant threats to agricultural productivity. Farmers often face losses when they cannot correctly identify the organisms responsible for damage in the field. Accurate identification is therefore the first step in effective crop protection, as it enables the use of appropriate control measures and prevents unnecessary waste of resources. This Series will guide you through the practical aspects of recognising pests and pathogens, helping you build competence in field diagnosis. The aim of this Series is to equip you with the skills to identify common crop pests and disease pathogens in the field, recognise their symptoms, and apply diagnostic techniques that support effective crop protection. We shall commence this Series by introducing crop pests and disease pathogens, defining them and highlighting their importance in crop production. Next, we will move on to the identification of insect pests in the field, examining their common types, characteristics, and the damage they cause. Following that, we will explore the identification of disease pathogens, focusing on fungal, bacterial, and viral agents, along with their visible symptoms. Finally, we will wrap up by studying field diagnostic techniques and recording methods, emphasising the importance of accurate diagnosis for successful crop protection. Series Learning Outcomes Upon completing this Series, you should be able to: SLO 1.1 define crop pests and disease pathogens and explain their importance in crop production, SLO 1.2 describe the impact of pests and pathogens on crop yield and productivity, SLO 1.3 identify common insect pests of major crops in the field, SLO 1.4 demonstrate how to recognise insect damage using field characteristics, SLO 1.5 identify common fungal, bacterial, and viral pathogens affecting crops, SLO 1.6 explain visible symptoms and diagnostic features of crop diseases, SLO 1.7 apply practical methods for recognising disease spread in the field, SLO 1.8 outline tools and aids used in field diagnostic techniques, SLO 1.9 record and report field observations accurately, and SLO 1.10 evaluate the importance of accurate diagnosis for effective crop protection.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.1 Introduction to Crop Pests and Disease Pathogens 1.1.1 Definition and importance of crop pests Crop pests are organisms such as insects, rodents, or birds that cause damage to crops in the field or during storage. They reduce yield, lower quality, and increase production costs. Recognising their importance is vital because unchecked pest infestations can lead to severe economic losses and food insecurity. Fill in the blank: __________ pests are organisms that cause damage to crops in the field or during storage. Figure 1.1 Examples of crop pests 1.1.2 Definition and importance of disease pathogens Disease pathogens are microorganisms such as fungi, bacteria, viruses, and nematodes that infect plants and cause diseases. They interfere with plant growth, reduce productivity, and may
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS even kill crops. Understanding pathogens is essential because they often spread rapidly and can devastate entire fields if not identified early. Fill in the blank: __________ pathogens are microorganisms such as fungi, bacteria, viruses, and nematodes that infect plants. Plate 1.1 Diseased crop leaves caused by pathogens 1.1.3 Impact of pests and pathogens on crop production The impact of pests and pathogens on crop production is significant. They reduce yield, compromise quality, and increase the need for costly interventions. In severe cases, they can cause total crop failure. Farmers must therefore be able to identify these threats promptly to apply appropriate control measures. Fill in the blank: Severe infestations of pests and pathogens can lead to total __________ failure. Impact Description / Notes Reduced yield Infestations and infections lower crop productivity, leading to significant yield losses. Poor quality Damaged crops result in inferior grain, fruit, or seed quality, reducing market value. Increased costs Farmers spend more on pesticides, fungicides, and management practices to control outbreaks. Crop failure Severe pest or pathogen attacks can destroy entire fields, threatening food security.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Box 1.1 Impact of pests and pathogens on crop production Pilot questions 1.1 Define crop pests. State one importance of crop pests in crop production. Define disease pathogens. Mention one example of a disease pathogen. State one impact of pests and pathogens on crop production. 1.2 Identification of Insect Pests in the Field 1.2.1 Common insect pests of major crops Insect pests are small animals that feed on crops, causing damage to leaves, stems, roots, or fruits. Common examples include stem borers in cereals, aphids in legumes, and fruit flies in horticultural crops. Each pest has a characteristic way of attacking plants, and recognising these helps farmers to take timely action. Fill in the blank: Stem borers, aphids, and fruit flies are examples of common __________ pests of crops.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Figure 1.2 Common insect pests of major crops 1.2.2 Field characteristics used for identification Insect pests can be identified by their field characteristics, which include their physical appearance, feeding patterns, and the type of damage they cause. For instance, aphids are small and soft-bodied, often found in clusters on tender plant parts, while stem borers leave holes in stems and frass deposits. Observing these traits in the field provides clues to the pest species present. Fill in the blank: Aphids are small, soft-bodied insects often found in __________ on tender plant parts.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Plate 1.2 Aphids clustered on crop leaves 1.2.3 Practical methods for recognising insect damage Recognising insect damage involves careful observation of plant symptoms. Chewed leaves, boreholes in stems, distorted growth, and discoloured patches are typical signs. Farmers should inspect different parts of the plant, including roots, stems, and leaves, to detect early infestations. Early recognition allows for prompt control measures, reducing losses. Fill in the blank: Chewed leaves, boreholes in stems, and distorted growth are typical signs of __________ damage. Sign Description / Notes Chewed leaves Visible holes, ragged edges, or missing portions of leaves caused by feeding insects. Boreholes Small entry or exit holes in stems, fruits, or seeds indicating boring insect activity. Distorted growth Twisted stems, curled leaves, or stunted plants resulting from insect feeding or toxins. Discoloured patches Yellowing, browning, or necrotic spots on leaves and fruits due to insect damage or disease transmission. Box 1.2 Practical methods for recognising insect damage
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