Problem

Look at table 14.1. What caused the changes in the effectiveness of the insecticide? If yo...

Look at table 14.1. What caused the changes in the effectiveness of the insecticide? If you were an agricultural extension agent, what alternatives to pesticides might you recommend?

Table 14.1 Insecticide Resistance of Houseflies to the Insecticide Cyfluthrin

	Houseflies from a Normal Population	Houseflies from a Poultry Facility Population
Concentration (ng/cm2)	8.3	8.3 (1×)	83 (10×)	830 (100×)
Percent survival	0	100	90	38

Source: Data from Scott, Jeffrey G., et al., “Insecticide Resistance in Houseflies from Caged-Layer Poultry Facilities,” Pest Management Science 56 (2000): 147–153.