15447
Results indicate that landscape heterogeneity affects the epidemiology and genetic structure of chiltepin - infecting begomoviruses in a scale - specific manner , probably related to conditions favouring the viruses ' whitefly vector and its dispersion .
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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:
 None