A1 FIELD CROPS PEST
MANAGEMENT PRACTICE
EXAM 50Q
Question 1: A �eld scout �nds a pest in only a few isolated patches below the economic threshold. What is the best IPM response?
Choices:
1) Treat the entire �eld immediately 2) Continue monitoring and consider spot treatment if needed 3) Increase nitrogen fertilizer 4) Harvest the crop at once
Correct Answer: Continue monitoring and consider spot treatment if needed
Explanation: IPM bases action on pest density, crop risk, and economics. When infestations are localized and below threshold, continued scouting and a targeted response are usually more appropriate than a whole-�eld treatment.Page 1
Question 2: Why should scouting locations be selected throughout a �eld rather than only along �eld edges?
Choices:
1) Edge plants always have lower pest pressure 2) Interior sampling reduces pesticide residues 3) Representative sampling reduces bias from uneven pest distribution 4) Field edges cannot contain weeds Correct Answer: Representative sampling reduces bias from uneven pest distribution Explanation: Pests are often patchy. Sampling representative locations across the �eld gives a better estimate of pest presence and density than relying on edge observations.Question 3: In IPM, an economic threshold is best described as the pest level at
which:
Choices:
1) Crop injury has already caused maximum loss 2) Control action should be taken to prevent economic injury 3) All pests must be eliminated 4) A pesticide label requires treatment
Correct Answer: Control action should be taken to prevent economic injury
Explanation: The economic threshold is the action point at which management is justi�ed to keep the pest population from reaching the economic injury level.Page 2
Question 4: Which practice is an example of cultural control in a �eld-crop IPM program?
Choices:
1) Using a parasitoid wasp release 2) Rotating crops to disrupt a pest life cycle 3) Applying a contact insecticide 4) Installing a spray pressure regulator
Correct Answer: Rotating crops to disrupt a pest life cycle
Explanation: Crop rotation changes the crop environment and can interrupt pest survival or reproduction, making it a cultural control tactic.
Question 5: A grower chooses a corn hybrid with resistance to a common disease.
This is primarily which IPM tactic?
Choices:
1) Host-plant resistance 2) Mechanical control 3) Chemical control 4) Regulatory control
Correct Answer: Host-plant resistance
Explanation: Selecting a resistant crop variety uses plant genetics to reduce pest injury and is a host-plant resistance tactic within IPM.Page 3