Tsai says that longan trees are hardy by nature and grow well without the use of insecticides. The only problem is that there is a certain moth which lays its eggs on the fruit after the flowers have withered. When the larvae hatch out they bore their way into the fruit to feed, which results in fruit drop and a reduction in the harvest.
蔡聰修表示，龍眼生性健壯，無農藥栽培沒什麼困難，只有一種蛾會在花謝結果後，在果實上產卵，然後蟲兒就會鑽進果實，吃光了養分，造成「落果」而使收成減少。