Agronomy Pest and Weed Management

Question 1

What is Integrated Pest Management (IPM)?

Accepted Answer

A strategy combining biological, cultural, mechanical, and chemical controls to minimize economic damage

Answer

Using only chemical pesticides to control pests

Answer

Eliminating all insects from a field

Answer

Relying solely on resistant varieties

Question 2

What is an 'economic threshold' in pest management?

Accepted Answer

The pest density at which control action must be taken to prevent economic loss

Answer

The cost of applying a single pesticide application

Answer

The maximum legal pesticide residue level

Answer

The number of pests that can be controlled per dollar spent

Question 3

Which weed management practice uses crop competition to suppress weed growth?

Accepted Answer

Increasing crop seeding rate and narrow row spacing

Answer

Post-emergence herbicide application

Answer

Fallowing

Answer

Hand weeding

Question 4

Palmer amaranth is considered one of the most problematic weeds in US row crops primarily because of what?

Accepted Answer

It has evolved resistance to multiple herbicide modes of action and grows extremely fast

Answer

It is a C3 plant with slow growth

Answer

It only affects organic fields

Answer

It produces few seeds per plant

Question 5

What does 'mode of action' refer to for a herbicide?

Accepted Answer

The biochemical pathway or enzyme in the plant the herbicide disrupts

Answer

The chemical formulation of the product

Answer

The application timing relative to crop emergence

Answer

The physical form of the herbicide (liquid vs. granule)

Question 6

European corn borer (ECB) larvae cause the most damage to corn at which crop stage?

Accepted Answer

During rapid vegetative growth and early reproductive stages (V6-R1)

Answer

At emergence (VE)

Answer

At physiological maturity

Answer

During germination