Which crop is not typically associated with PCNB treatment?

PCNB, or Pentachloronitrobenzene, is a fungicide that is primarily used for the control of soil-borne diseases, particularly in certain crops. The crops typically associated with PCNB treatment include garlic, wheat, and potatoes, as they are more susceptible to diseases that PCNB effectively addresses.

Garlic is often treated with PCNB to manage various fungal pathogens that can affect its yield and quality. Similarly, wheat can benefit from PCNB treatment to protect against pathogens like Fusarium spp. Potatoes are also commonly treated with PCNB to combat diseases such as late blight, which can severely impact production.

In contrast, rice is less commonly associated with PCNB treatment, as the primary concerns in rice production involve issues like blast disease and other pathogens that may be more effectively managed with different fungicides or agronomic practices. Therefore, the connection between PCNB and rice is not as strong as with the other crops mentioned, making it the best choice for this question.