Navel organgeworm infestations have cost almond growers $393 per acre on average and pistachio growers $262. This adds up to about 8% and nearly 4% of revenues, respectively.
 
To determine those numbers, UC Davis ag economists studied three years of data on tree damage, costs for management practices, reduced revenues, and threats to food safety and trade.

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Silver lining: The researchers found that even in years of low nut prices, the returns from deploying integrated pest management practices to combat NOW easily outweighed the costs.