Final answer:
The exact percentage of conventionally grown foods contaminated with pesticide residue is not specified in the provided information. The Environmental Working Group's "Dirty Dozen" list emphasizes concerns about pesticide residue, with impacts on agriculture and consumer demand such as the increased demand for organic strawberries.
Step-by-step explanation:
The question pertains to the amount of conventionally grown foods that contain pesticide residue according to USDA estimates. As of the most up-to-date information, the Environmental Working Group's "Dirty Dozen" list, a prominent resource that tests for pesticide residue in produce, helps highlight the issue of pesticides in agriculture.
For instance, the inclusion of strawberries on this list in 2013 led to increased demand for organic strawberries, influencing both the equilibrium price and quantity of sales. The choice among the options provided (11, 34, 23, 73, 58) is not directly stated in the information given, and without current USDA data in the provided references, we cannot accurately provide a percentage. It is pertinent to note that the use of pesticides in agriculture has broader ecological implications, such as the negative effects on honey bee populations and on the environment as a whole.