Which of the following statement is true about

16. Which of the following statement is true about economic injury and threshold
Level?
1 point
*
A. a crop EIL, helps a grower determine the point at which pest population causes enough
damage to justify the time and expense of active control measures
B. this threshold is exceeded when the financial loss caused by the pest surpasses the cost of
pest control
C. when action must not be taken to avoid additional crop damage
D. both a and b
17. An unwanted organism which competes with man for food and shelter or threatens
their health, comfort and welfare. *
1 point

D. Pathogens
18. A toxic substance which is readily available and kills pest instantly is termed__. *
19. A control strategy where synthetic toxic substance or bioactive plant products are
used to combat pest population. *
1 point
20. This refers to the control of pests by living organism s under either natural or
artificial -environment *
1 point
A. Cultural control
B. Physical control
C. Chemical control
D. Biological control
21.From agricultural point of view, insects are beneficial because of the following,
except when; *
1 point
22. Water management can be categorized under all methods of control except; *
1 point
23. The insecticide that kills a wide array of insect pest species is ___. *