Incidence and Population Dynamics of Various Associated Insect-pests of Late Direct Sown Paddy, Oryza sativa L. at Gajapati, Odisha

Abstract

Background: Rice is the most important staple food of the world. Rice production is now-a-days reduced due to insect pest attacking to the crop in various growing stages. There are more than 1400 pest species, which are cause great menace to the rice cultivation. Incidences and abundance of pests in rice is growing day by day due to climatic change and excess use of chemical pesticides. In late direct sown paddy is also facing the insect pest problems in different growing stages. The study aimed to layout the different pest’s incidence and population dynamics as well, on various stages of direct sown paddy. The knowledge of incidence timing for various pests can be further utilized for the suitable management. Methods: The present study has been conducted during the late Kharif seasons of 2021-22 for 11 most widely grown paddy cultivars of farmers field around the locality of MS Swaminathan School of Agriculture, Centurion University of Technology and Management, Paralakhemundi, Odisha. The surveyed cultivars were Anjali, Arize 8433, BAM-6, Bhuban, Chandra, CR Dhan 100, Varsha Dhan, CR Dhan 306, Sumit, Luna Sankhi and Vandana, respectively. These cultivars were surveyed for the abundance of various associated insect-pests at two different crop growth stages. Result: The results revealed that the incidence of various pests namely Scirpophaga incertulus, Orseolia oryzae, Cnaphalocrocis medinalis, Parapoynx stagnalis, Dicladispa armigera, Leptocorisa acuta, Grasshoppers, Nezara virdula, Nephotettix virescens, Melantis leda and Mythimna separate was found to be significant for both the growth stages. The maximum population on late direct sown rice was found to be of Scirpophaga incertulus (3.67) and Orseolia oryzae (2.67) at the vegetative stage of rice while pests such as Cnaphalocrocis medinalis (6.34), Leptocorisa acuta (7.34) and Mythimna separate (5.67) were recorded maximum during the milking stage of rice.