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The number of digits in a PLU code and the digits themselves carry specific meanings. A four-digit PLU code indicates that the produce was conventionally grown, while a five-digit code starting with the number 9 signifies organic produce. A five-digit code beginning with the number 8 indicates that the produce is genetically modified. Recognizing these distinctions is crucial for consumers who are concerned about the methods used to grow their food.

Genetically modified produce is identified by a five-digit PLU code that starts with the number 8. These fruits and vegetables have been altered at the genetic level to exhibit certain traits, such as resistance to pests or longer shelf life. While genetically modified organisms (GMOs) are deemed safe by many scientific organizations, some consumers prefer to avoid them due to health, ethical, or environmental concerns.

Conventionally grown produce is labeled with a four-digit PLU code. This type of produce is grown using traditional agricultural methods, which may include the use of synthetic fertilizers, pesticides, and herbicides. While these practices can increase yield and reduce costs, they may also raise concerns about chemical residues and environmental impact.