Biological alternatives to pesticides in agriculture do not harm non-targets organisms including natural enemies of insect pests. Experiments were conducted at sugarcane fields during 2015 to 2019 to assess large scale biocontrol practices, involving inundative releases of trichogrammatids against lepidopteran borers in comparison to conventional chemical-based farmers’ practice. Eight releases each of Trichogramma chilonis Ishii and Trichogramma japonicum Ashmead were made at 50,000 ha−1 at 10 days interval for the management of sugarcane stem borer, Chilo infuscatellus Snellen and the sugarcane top borer, Scirpophaga excerptalis (Fabricius) (Lepidoptera: Crambidae), respectively. Likewise, 10–12 releases of T. chilonis were made at 50,000 ha−1 at 10 days interval for the management of sugarcane stalk borer, Chilo auricilius Dudgeon (Lepidoptera: Crambidae). The biocontrol intervention was compared with farmer’s practice (chemical control) in managing these borers. The results showed that farmers’ practices and biocontrol treated fields resulted in a lower incidence of C. infuscatellus (1.1, 2.9%) and S excerptalis (1.7, 3.9%) than the untreated control fields, wherein the mean per cent incidence of these borers (6.8, 8.5%) was significantly higher. The incidence of C. auricilius was also lower in augmented fields (2.8%) than untreated fields (7.3%). The yield data indicated that farmers adopting biocontrol practices were able to get comparable yield and benefit: cost ratio than farmers’ practice, both being better than untreated control. Moreover, in biocontrol fields, parasitism rate on the factitious host, Corcyra cephalonica Stainton cards was estimated. Thus, the study highlights the significance of adoption of biocontrol-based technology over a long run to provide sustainable system of sugarcane insect pest management and economic benefits to the stakeholders.

中文翻译：

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甘蔗主要bore虫害虫增强生物防治策略的评估—大规模现场评估

农业中农药的生物替代品不会损害非目标生物，包括害虫的天敌。在2015年至2019年期间，对甘蔗田进行了实验，以评估大规模的生物防治措施，与传统的以化学药品为基础的农民的措施相比，涉及到针对鳞翅目rs虫的Trichogrammatids的过量释放。每10天间隔50,000 ha-1间隔八天，分别进行一次Trichogramma chilonis Ishii和Trichogramma japonicum Ashmead的管理，以管理甘蔗stem，Chilo infuscatellus Snellen和甘蔗top虫Scirpophaga excerptalis（Fabricius）（鳞翅目：Crombidae），分别。同样，在10天间隔50,000 ha-1间隔10到12天释放了T. chilonis，用于管理甘蔗茎bore，Chilo auricilius Dudgeon（鳞翅目：mb科）。将生防干预措施与农民在处理这些蛀虫上的实践（化学控制）进行了比较。结果表明，农民的做法和经过生物防治的田地比未处理的田间的烟叶梭状芽胞杆菌（C. infuscatellus）（1.1％，2.9％）和Ex Sertptalis（1.7％，3.9％）的发病率要低，其中这些bore虫的平均发生率为（6.8，8.5％）明显更高。增强田中金龟耳的发生率也较低（2.8％），而未处理田（7.3％）低。产量数据表明，采用生物防治措施的农民能够获得可比的产量和收益：成本比，与农民的做法相当，两者均优于未处理的防治措施。此外，在生物防治领域，估计了人为宿主Corcyra cephalonica Stainton卡的寄生率。从而，