Lesson Notes By Weeks and Term v4 - SHS 2
HEALTH ISSUES IN CROP PRODUCTION
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HEALTH ISSUES IN CROP PRODUCTION
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Agriculture
Class: SHS 2
Term: 2nd Term
Week: 7
Grade code: 2.4.1.LI.3
Strand code: 4
Sub-strand code: 1
Content standard code: 2.4.1.CS.1
Indicator code: 2.4.1.LI.3
Theme: AGRICULTURE AND HEALTH
Subtheme: HEALTH ISSUES IN CROP PRODUCTION
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Welcome, future farmers and agricultural scientists! Today, we are discussing a topic that is critical to the success of every farmer in Ghana and to the health of everyone who eats. Imagine a farmer plants a beautiful field of maize, invests money in fertilizer, and spends weeks weeding, only to see the leaves turn yellow and the cobs rot before harvest. This is the devastating impact of crop diseases. This lesson is about being proactive and strategic. We will learn how to protect our crops from diseases before they even start (prevention) and how to fight them effectively if they appear (control).
A. What is a Crop Disease?
A crop disease is any harmful change or malfunction in a plant caused by a continuous irritation from a primary agent. These agents are called pathogens. The main types of plant pathogens are: Fungi: (e.g., causing Black pod in cocoa, Rust in maize) Bacteria: (e.g., causing Bacterial wilt in tomato, Cassava bacterial blight) Viruses: (e.g., causing Cocoa Swollen Shoot Virus (CSSV), Maize streak virus) Nematodes: (Microscopic worms that attack roots, e.g., Root-knot nematodes in garden eggs)
It is important to differentiate a disease (caused by a pathogen) from a pest (like an insect, rodent, or bird that physically damages the plant). However, many pests (like aphids) can act as vectors, meaning they carry and transmit pathogens from a sick plant to a healthy one. B. The Core Principle: Prevention vs. Control
This is the most important concept to understand. Prevention ("Anuanom, before the trouble comes"): These are actions a farmer takes *before* a disease is observed on the farm. The goal is to create an environment where it is difficult for pathogens to establish and spread. Prevention is always better and cheaper than control. *Analogy:* Washing your hands with soap to avoid getting cholera is prevention. Control ("The trouble is here, how do we fight it?"): These are actions taken *after* a disease has been identified on the farm. The goal is to reduce the severity of the disease, stop its spread, and minimize crop losses. *Analogy:* Taking medication after a doctor has diagnosed you with malaria is control. C. Categories of Preventive and Control Measures