The egg parasitoid, Trichogramma japonicum (Hymenoptera:Trichogrammatidae) is a documented successful biocontrol agent to reduce rice yellow stem borer (YSB), Scirpophaga incertulas (Lepidoptera: Crambidae). In the present study, three kairomone gel formulations: T₁: n-hexadecanoic acid (200 ppm); T₂: n-octadecanoic acid (500 ppm) and; T₃: octadecane (500 ppm); were applied 24 h after each release of adult T. japonicum in low land rice field plots during the rainy season (2018) and summer season (2019). The study evaluated whether the combination of the kairomone gel treatments with parasitoid could improve suppression of YSB. The best results were from T₃: application of octadecane gel, 24 h after each T. japonicum release (@ 50,000 wasps/ha × 4 releases) on the 32^nd, 39^th, 46^th, 53^rd days after transplanting (DAT) at weekly intervals during the rainy season (2018). This regime reduced incidence of YSB induced damage called: ‘dead heart’ and ‘white ear’ by 30.01%–37.06% compared to T₅: control. During the summer season (2019) again the best results were observed in T₃: octadecane augmented wasps releases, the reduction in damages by YSB ranged from 17.86% to 24.47% below control. The grain yields in T₃, increased from 14.61% to 15.73% across both seasons measured. These results support augmenting T. japonicum releases with the kairomone gel containing octadecane provide an affordable treatment to increase parasitic activity and to reduce damage in rice crops caused by YSB.

卵寄生的拟南芥（Trichogramma japonicum）（膜翅目：Trichogrammatidae）是一种成功的生物防治剂，可减少水稻黄茎bore（YSB），Scirpophaga incertulas（鳞翅目：Crambidae）。在本研究中，三种海洛酮凝胶制剂：T ₁：正十六烷酸（200 ppm）; T ₂：正十八烷酸（500ppm）；和 T ₃：十八烷（500 ppm）；在雨季（2018）和夏季（2019）的低陆稻田中，每次释放成年刺参后24小时施药。该研究评估了海洛酮凝胶疗法与类寄生虫的组合是否可以改善对YSB的抑制作用。最好的结果来自T ₃：应用十八烷凝胶，每24小时后T.血吸虫释放（@ 50000只蜂/公顷×4个版本）上的32^次，39^次，46^次，53^次在雨季每隔一周移栽（DAT）后的天数（2018）。与T ₅对照组相比，该方案可将YSB诱导的称为“死心”和“白耳”的损伤的发生率降低30.01％–37.06％。在夏季（2019）期间，再次在T ₃中观察到了最佳结果：十八烷增加了黄蜂的释放，YSB造成的伤害降低幅度比控制范围低17.86％至24.47％。T _3中的谷物产量，在所测量的两个季节中都从14.61％增加到15.73％。这些结果支持用含有十八烷的海洛酮凝胶增加日本血吸虫的释放，提供了一种负担得起的治疗方法，以增加寄生活性并减少由YSB引起的水稻作物损害。