Unit 9C and 9D Lesson 7 Weeds and Pests

1
Unit 9C and 9D Lesson 7 Weeds and Pests

• Objective to learn how we prevent weeds and
  other pests destroying farmers crops. To learn
  some of the problems with the above methods.

2
Weeds and Pests

• Both of these are very common terms but have very
  specific meanings.
• Weed any plant which is growing where we dont
  want it to. They can prevent crops from growing
  by stealing water and nutrients.
• Pest is an animal (bird, slug, insect, mouse,
  etc.) which is destroying crops.

3
Herbicides, Pesticides, Fungicides, and
Insecticides.

• Herbicides chemicals which destroy plants.
• Pesticides chemicals which destroy pest.
• Fungicides chemicals which destroy fungi.
• Insecticides chemicals which destroy insects.

4
Type of Herbicides

• There are two types of herbicides
• Non-selective
• kill a large variety of plants sometimes
  including the crop.
• They have to be sprayed before the crop is
  planted.
• Selective
• Are designed to kill only certain types of
  plants.
• They can be sprayed after the crop has been
  planted.

5
General Herbicide Application

• General Application is the process of spraying an
  entire field including crop and weeds.

Crop Dusting
Crop Spraying
6
Spot Spraying Herbicide Application

• For spot application the herbicide sprayer is
  carried on a persons back or in a spray bottle.
  The weeds can then be sprayed one at a time.

7
Weed Wiper Herbicide Application

• Weed Wiper a wick is soaked in herbicide and
  mounted on a tractor and set to a certain height.
  Only the plants tall enough to reach the wick
  will be treated with herbicide.

Herbicide is applied to the wick.
Only plants tall enough to touch the wick get a
herbicide application.
8
Work to Do

• Complete Activity 7.5 and 7.6 Killing Weeds and
  Pests I and II
• Homework
• Read page 93.
• Complete the Remember section page 93
• Complete questions 1-6 and 8 page 93
• Define the following keywords
• Herbicide, non-selective herbicide, selective
  herbicide,