5.4 understand the reasons for pest control and the advantages and disadvantages of using pesticides and biological control with crop plants

• Monoculture - field of wheats : they tend to be accessible of pests which crop as there own food sources.
• The productivity is food and financial. The pesticides -chemicals which kill pests.

Advantages	Disadvantages
Chemicals obtain	Toxic – kill other plants and harm humans
Easy to apply not to different to farm	Bio accumulation
Very effective	Resistance

• The moth eat away the cactus.
• This is called "Biological control"

Advantages	Disadvantages
No toxic chemical involve	Not 100% effective
Less impact on wildlife	Difficult to control
	Difficult to match the predator to prey