The larvae stage of ruddy dagger moth can cause mild allergies in a small number of people through contact with their hair. Common symptoms include skin irritation and respiratory discomfort. The degree of risk is generally low, but individuals with known sensitivities should limit direct interaction with the larvae to avoid allergic reactions.

The larval stage of ruddy dagger moth can inadvertently lead to discomfort among humans. Their hair may detach and come into contact with human skin or be inhaled, which in susceptible individuals causes allergic reactions like skin rashes and respiratory troubles due to the irritating nature of the larval hair.

To minimize the risks associated with ruddy dagger moth, avoid areas where their larvae are known to reside. Wearing protective clothing and using environmental controls such as screens or barriers can prevent contact with the larvae hairs that cause allergic reactions.

If discomfort from ruddy dagger moth occurs, thoroughly washing the affected area with soap and water may help alleviate symptoms. For respiratory discomfort, moving to an area with clean air and focusing on calm, regular breathing can assist recovery. During this period, individuals should avoid further contact with the larvae and areas where these insects are prevalent until symptoms have subsided. Consulting with a professional for non-medical interventions and environmental adjustments might also be beneficial.

As ruddy dagger moth larva feeds, it chews through plant tissues, particularly the leaves of oaks and maples. This causes defoliation, reducing the plant's ability to photosynthesize. Over time, the host trees can experience stunted growth, reduced vigor, and increased susceptibility to secondary pests and diseases due to this loss of foliage.