pests and diseases

Safe use of chemicals. Image credit montana.edu ZIMSEC Combined Science Notes: Safety when using chemicals

• Pesticides are almost always harmful to human beings.
• They are graded according to their level of toxicity i.e. how dangerous they are to humans.
• There are no safe pesticides all are […]
  

Safety Equipment Image credit nexomundo.com ZIMSEC O Level Combined Science Notes: Safety wear

• Pesticides are dangerous and need to be handled with care.
• The following equipment ought to be used when handling chemicals depending on the instructions of each chemical’s label and its usage directions.

Tomato plant with red mite. Image credit thedemogadern.org ZIMSEC O Level Combined Notes: Pest Control

• Pests cause damage to plants and spread diseases.
• This results in a reduction in crop yields.
• Control measures can be taken to minimise this damage.
• The control measures can be either […]