Impact of Abiotic and Biotic factors on population of sugarcane leaf hopper, Pyrilla perpusilla (Walk.) at Chhattisgarh

Abstract

Impact of the various abiotic and biotic parameters on population of sugarcane leaf hopper, Pyrilla perpusilla (Walk.) was studied during 2016-17 and 2017-18 at Kawardha (Kabirdham) district of Chhattisgarh. On the basis of pooled mean various abiotic parameters viz. Maximum temperature, minimum temperature, relative humidity and sunshine hours and biotic parameters viz. egg parasitoid Tetrastichus pyrillae (Chrawford) and ento-pathogenic fungus, Metarhizium anisopliae (Metschn) were showed positive impact on the population of Pyrilla but in case of wind velocity and rainfall negative impact were shown. The Pyrilla population was reached maximum with 8.13 eggs, 28.16 nymphs and 5.17 adults leaf-1 at first fortnight of October. During this period, pooled two year mean maximum temperature, minimum temperature, relative humidity, rainfall, wind velocity and sunshine was 31.70C, 24.70C, 80.3%, 26mm, 2.0 Km hr-¹ and 7.4 hr day-¹ respectively. The maximum parasitization by T. pyrillae was noticed during second fortnight of December with 44.16 per cent and ento-pathogenic fungus M. anisopliae was high during the second fortnight of October with 11.37 per cent. In various abiotic weather parameters, the maximum temperature play significantly important role in the fluctuation the population of P. perpusilla.