Thosea sinensis's larvae possess defensive toxins that, upon contact with human skin, can cause irritation. The larvae have specialized hairs that release these toxins as a defense mechanism. Upon touch, the mild irritant toxins can provoke immediate skin reactions. Long-term effects are generally limited, but severe complications can include persistent dermatitis.

Thosea sinensis, at the larval stage, has the potential to cause mild to severe allergic reactions in a small group of individuals through contact with its hair or toxins. Typical symptoms could include skin rashes or irritations. The degree of severity varies among individuals, so caution is advised when near these larvae, especially for those with known sensitivities.

The larvae of thosea sinensis possess defensive toxins which are released through specialized hairs as a part of their self-defense mechanism. When humans come into contact with these hairs, skin irritation can occur. While most reactions are mild and limited, individuals with sensitivities may experience more severe outcomes, such as persistent dermatitis due to these allergenic compounds.

To prevent troubles associated with thosea sinensis, avoid areas where the larvae are known to inhabit, especially during their active periods. Use protective clothing to minimize skin exposure. Regularly maintaining and cleaning environments can reduce their presence. Educate community members about their habitats and the potential risks they pose to encourage collective vigilance.

If skin contact with thosea sinensis occurs, gently washing the affected area with soap and water may help to alleviate irritation. Cold compresses can also be applied to soothe any discomfort. It is important to resist the urge to scratch, as this may exacerbate the condition. In the recovery period, keep the area clean, monitor for signs of persistent irritation, and seek further assistance if symptoms do not improve. Practice good personal hygiene and ensure household cleanliness to support recovery and prevent recurrence.

The larvae of thosea sinensis can pose a mild to severe threat to crops by chewing on plant tissues, primarily leaves. Minor infestations may cause cosmetic damage, while severe infestations can lead to defoliation, reduced photosynthesis, and impaired growth, potentially reducing crop yields significantly. This pest's impact on agriculture could indirectly affect food supply and prices.