The larval stage of kunugia divaricata can trigger allergies in humans through contact with its hair, affecting a small number of people. Allergy symptoms range from mild to severe and vary per individual. While not universally allergenic, caution is advised for susceptible individuals who may experience discomfort upon exposure.

The larval stage of kunugia divaricata has hair that can become airborne and, upon contact with human skin, may trigger allergic reactions in susceptible individuals. The degree of these reactions varies but is generally mild. The complications arise because the hairs can detach easily and spread into the surrounding environment, thereby increasing the likelihood of human contact.

To minimize the risk of allergic reactions to kunugia divaricata, individuals should avoid areas where these larvae are known to be prevalent. Utilizing physical barriers such as protective clothing and ensuring living spaces are well-sealed from outdoor access can help reduce exposure. Regular cleaning to remove possible stray hairs is also recommended.

If symptoms of an allergy occur due to contact with kunugia divaricata, thoroughly washing the affected area with soap and water may help alleviate mild reactions by removing irritant hairs. Cool compresses or soothing lotions can provide symptom relief. In living spaces, frequent vacuuming and dusting with damp cloths can help reduce the presence of irritant hairs. It is important for individuals to seek professional advice if symptoms persist or worsen. During recovery, individuals should continue to avoid areas where exposure to kunugia divaricata might recur.

When kunugia divaricata larvae feed, they chew on pine tree leaves, resulting in defoliation. The loss of leaves impairs photosynthesis, which can stunt plant growth, reduce cone production, and in severe cases, precipitate tree death. This Lepidoptera family member's damage can lead to notable tree stress, potentially weakening the plant's defenses against other pests or diseases.