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The relationship between susceptibility of different peach cultivars ( cvs ) to the Mediterranean fruit fly ( medfly ) , Ceratitis capitata , and the volatile composition of ripe fruit of each cv has been investigated , since understanding the fruit - insect interaction mechanism is crucial for developing control strategies for such a pest .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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