Which of the following plants is not commonly associated with leaf miners?

Rhododendrons are not commonly associated with leaf miners, which are pests that create visible tunnels or mines within the leaves of various plants. Leaf miners tend to prefer certain families of plants, particularly those belonging to the aster family, such as zinnias and chrysanthemums. Verbenas may also be affected by different types of pests, but they are not a typical host for leaf miners.

In the case of rhododendrons, while they can be susceptible to other pests and diseases, leaf miners specifically are less likely to target them. This is due to the chemical composition and structure of rhododendron leaves, which may be less appealing or accessible to leaf-mining larvae compared to other more common host plants. Additionally, environmental factors and the specific habits of leaf miner species contribute to the association between certain plants and these pests.

Understanding the plant-pest relationship is crucial for effective pest management in ornamental horticulture, and recognizing which plants are less likely to be affected by specific pests can help in developing a targeted control strategy.