Abstract: The Chinese horned gall aphid, Schlectendalia chinensis, is a major species of Chinese gallnut aphids. It produces horned galls that are economically important because of their medical and chemical properties, chiefly tannic acid. S. chinensis has six forms in its life cycle. Only one of these six forms, the fundatrix, is feeding on leaves and triggering the formation of a gall on its host tree, Rhus chinensis. The authors developed three different approaches in order to maximize the gall formation on R. chinensis by a combination of moving the winter host moss in close vicinity of the Rhus tree and/or hanging bags containing populations of aphids to the tree trunk. The results showed that the gall number per tree was about 10-fold higher than that of the controls in conditions where two bags containing aphid population of different age were provided to the tree trunk. Further, it was found that the number of leaves forming a gall increased up to 5-fold per tree and similarly, the authors measured a 4-fold increase in the percentage branches that harbor galls. Detailed analysis of how galls are distributed demonstrated that while controls formed galls on the first seven compound leaves, optimized conditions extend the production of galls to the first eleven compound leaves. Finally, the gall number per leaf also increased by various approaches. For instance, the percentage of leaves forming just one gall reduced by half compared to the controls, while the leaves containing 4 or more galls increased from 5% to >30% when providing two bags containing aphid population of different age.