Economic Threshold P2
Insect Density
P1 = Population 1
Pest Population
P2 - Population 2
P3 Population 3
Time
a. A farmer at Dormaa intends to spend GHS 1,500 to control pests on his 40-acre
maize farm, as a crop advisor, at what population density would you advise the
farmer to apply control measures? P1 or P2 or P3? Explain your answer,
(5 marks)
b. From the graph, there were drops in the population density. Explain two factors
that may attribute to the drop in population density with respect to time. ​