Larvicidal potential of Skermanella sp. against rice leaf folder (Cnaphalocrosis medinalis Guenee) and pink stem borer (Sesamia inferens Walker).

摘要: Abstract Insect pests in the rice agroecosystem, particularly leaf folder, Cnaphalocrosis medinalis (Guenee) and stem borer, Sesamia inferens (Walker), cause significant yield losses. These are generally managed by farmers application of insecticides a few biocontrol agents. As component integrated pest management, agents play dynamic role control. Although diverse microbial communities available ecosystem, bacterial genera such as Bacillus Pseudomonas spp. broadly used Therefore, an attempt was made to identify other effective entomopathogenic bacteria manage above mentioned pests. In this study, two isolated from diseased pink borer (S. Walker) larvae collected fields were identified Skermanella sp. (KX611462) Serratia (KX761232). The larvicidal activity these evaluated against third instar C. S. vitro assays on potted plants (Oryza sativa var. TN1). results study demonstrated 50% (LC50) larval mortality at 2.95 × 103 5.88 × 103 colony forming units (CFU) ml−1 for sp., respectively, under conditions, 2.57 × 104 3.38 × 104 CFU ml−1, whole plant assays. Similarly, LC50 value 3.80 × 104 CFU ml−1 2.29 × 105 CFU ml−1 larvae. Our reports inferens.