Rice hispa D. armigera is one of the most significant global crop production constraints. It attacks the vegetative stages of summer rice, causing a 35-65 percent yield loss, and post-flooded transplanted rice, causing a 100 percent yield loss throughout Assam, making it one of the major limiting factors in rice production in Assam. Beauveria bassiana (Bals.) Vuill. is a naturally occurring potent entomopathogenic fungus that has been used successfully to control a variety of rice insect pests, including rice hispa. Beauveria bassiana (Bals.) Vuill (Strain) was used to develop a good formulation. AAU-09) is grown in potato broth, rice gruel, coconut water, rice husk, sawdust, and rice bran. Among the solid media tested, rice husk with 2% dextrose produced the most spores (6.25 x 107 conidia/ml) and had the highest pathogenecity (86.67%) to adults of Dicladispa armigera (Olivier) (Coleoptera: Chrysomelidae). Similarly, among the liquid media, potato broth supplemented with synthetic chitin (2%), dextrose (2%), and peptone (2% ) supported maximum spore production. Chitin is required not only for spore production, but also to increase the power of penetrating the cuticle.
Author (s) Details
Dr. Purnima Das
Department of Entomology, Assam Agricultural University (AAU), Jorhat, 785 013, Assam, India.
Professor L. K. Hazarika
Academic Registrar Assam Women's University Jorhat, 785004, Assam, India.
Dr. D. Bora
Department of Life Sciences, Dibrugarh University, Dibrugarh, 786 004, Assam, India.
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