Control of white stem borer Schirpophaga innotata Walker and earhead bug Leptocorisa oratorius Fabricius by using formulated Calotropis gigantea linn extract in rice field

Abstract

The data of article is part of S2 student researchWhite stem borer (WSB) and earhead bug (EHB) play an important role in reduction of productivity and quality on rice. To overcome the problem by high application of synthetic fungicide for managing these pests, the use of Calotropis gigantea extract is one of alternatives as environmentally friendly agent in control technology. On rice field non treated in span time of 33 days untill 97 days, the WSB population and their incidence was optimum respectively at 53 days and 57 days apter transplanting, while the optimum of EHB population and their incidence was respectively at 83 days and 87 days after transplanting. Through comparing to the control, treatment with leaves extract of C. gigantea formulated in form of powder applied through spraying with concentration of 10g/l, 20g/l and 30g/l at these optimum days reduced WSB population by respectively 54.2%, 66.7%, and 75.0% and WSB incidence by respectively 34.0%, 42.8%, and 51.7%. With same concentration as mentioned above, formulated C. gigantea reduced also EHB popolation by respectively 38.4%, 45.2%, and 63.0% and EHB incidence by respectively 40.3%, 50.7%, and 58,7%. These data demonstrated the efficacy of formulated C. gigantea in controlling rice pests of WSB and EHB