SS 2 Second Term Agricultural Science Lesson Note – Weeds and Weed Control

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Subject: Agricultural Science.

Topic: WEEDS AND WEED CONTROL

Content:

1. Meaning of weeds
2. Types of weed
3. Effects of weeds on crops and Economy
4. Characteristic Features of weeds
5. Methods of controlling weeds

Subtopic1: Meaning of weeds:

Weeds are often called volunteer plants because they grow where they are not planted. They are plants which grow where they are not wanted. They can also be defined as”plants out of place”. They are usually unwanted, uninvited quests on farms. Also , their growth  interfere with that of cultivated crops and therefore constitute nuisance to crops, livestock or even man. An edible crop could become a weed if it grows where and when it was not planted, example maize growing on a land where cassava is planted is a weed.

Sub topic 2: Common weeds (common weeds)

Some of the common weeds include:

Common Name	Botanical (scientific name)
1.Wire grass	Sporobolus pyramidalis
2.Siam weed 3.Blue feather	Chromoleana  odorantum (-Eupatorium adoratum) Commelina nudiflora
4.Yellow feather	Commelina legosienesis
5.Bush marigold	Aspilia africana
6.Stubborn grass	Eleucine indica
7.Stubborn weed	Sida acuta
8.Goat weed	Ageratum conyzoides
9.Money weed	Acantosperniumhispidium
10.Pig weed	Boerhevia diffusa
11.Tete (green with thorns)	Amaranthus spinosus
12.Tete( green with no thorns)	Amaranthu caudatus
13.Water leaf	Talinum triangulare
14.Sedge plant (umbrella grass)	Cyperus alternifolius
15.Tridax	Tridax procumbens
16. Emillia	Emilia sognifochia
17.Milk weed	Euphorbia heterophylia
18.Desmodium	Desmodium spp.
19.Spear grass	Imperata cylindrical
20.Sensitive plant	Mimosa pudica
21.Elephant grass	Penisetum purpureum
22.Calopo	Calopogonium mucunoides
23.Stylo	Stylosanthes gracilis
24.Centro	Centrosema pubescens
25.Guinea grass	Panicum maximum
26.Carpet grass	Cynodon dactylon
27.Northern gamba	Andropogon gayanus

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