<h1><strong>EFFECTS OF WEED CONTROL METHODS ON VEGETATION AND SOIL</strong></h1> CONTENT <ol> <li>Effects of Chemical Control of Weeds on Vegetation and Soil</li> <li>Effects of Bush Burning on Vegetation and Soil</li> <li>Effects of Mechanical/Physical Control of Weeds on Vegetation and Soil</li> <li>Effects of Biological Control of Weeds on Vegetation and Soil</li> <li>Adverse Effects of Weeds/Problems Posed by Weeds in Agriculture/Economic Importance of Weeds</li> </ol>   <h2><strong>Effects of Chemical Control of Weeds on Vegetation and Soil </strong></h2> The following are the effects of chemical control of weeds on vegetation and soil: <ol> <li>Herbicides can be poisonous to human beings.</li> <li>Beneficial organisms may be destroyed.</li> <li>Herbicides can pollute soil and ground water.</li> <li>Herbicides can contaminate livestock pasture thereby killing the animals that feed on them.</li> <li>Some herbicides, when used, can kill both good and unwanted plants and animals.</li>

<h1><strong>DISPERSAL OF WEEDS (WEED DISSEMINATION)</strong></h1> CONTENT <ol> <li>Introduction</li> <li>Meaning of Weed Dispersal</li> <li>Agents of Weed Dispersal</li> </ol> <h2><strong>Introduction</strong></h2> Weeds are widely dispersed through various adaptations. This is one of the reasons why weeds survive and are found in almost all cultivated fields. <h2><strong>Meaning of Weed Dispersal </strong></h2> This is the process by which seeds of weeds, fruits and propagules are carried from one place to another through one agent or the other. <h2><strong>Agents</strong> <strong>of Weed Dispersal</strong></h2> The agents of weed dispersal include the following:

<h1><strong>MEANING, TYPES AND CLASSIFICATION OF PESTS</strong></h1> CONTENT <ol> <li>Meaning of Pest</li> <li>Type of Pests</li> <li>Classification of Pests based on Mouth Parts</li> <li>Classification of Insect Pests based on the Location</li> </ol> <strong> </strong> <h2><strong>Meaning of Pest</strong></h2> Pest can be defined simply as any living organism, plant or animal, which can cause damage to cultivated crops, animals and human beings. Human beings can also be called pests if they cause damage to crops or livestock. Pests can carry organisms that cause diseases and constitute nuisance to agricultural products. Majority of crop pests are invertebrates e.g. insects and eel-worms.

<h1><strong>DESCRIPTION OF THE DAMAGE DONE BY PESTS</strong></h1> CONTENT <ol> <li>Description of the Damage Done by Pests</li> <li>Table Showing the Description of Damage Done by Crop Pests</li> </ol>   <h2><strong>Description of the Damage Done by Pests</strong></h2> Crop pests do a lot of damage to crops either on the farm or in the store. The damages done by pests include: (i) Some insect pests are carriers of diseases which they transmit to healthy plants. Examples of diseases transmitted by insect are: ground nut rosette, cassava mosaic, swollen shoot of cocoa, etc. (ii) Mammals (rodents) e.g. rats, grass-cutter eat up the tubers of yam, cassava and potato.

<h1><strong>EFFECTS OF CROP PESTS ON YIELD</strong></h1> CONTENT <ol> <li>Effects of Crop Pests on Yield</li> <li>Economic Importance of Pests</li> </ol>   <h2><strong>Effects of Crop Pests on Yield</strong></h2> Crop pests have the following effects on crop yield: <ol> <li>Heavy attack by pests may result in total crop failure.</li> <li>Infected seeds, crops, and vegetables have low market value.</li> <li>Pests reduce the quality of crops.</li> <li>Pests eat up leaves of crops, thereby reducing the photosynthetic activity of the plant.</li> <li>They cause injury which may predisposes crop to diseases attack.</li>