Perpetuation of Phoma naikii in the crop debris of pigeon pea Sahana S.1,*, Savitha A.S.1, Ajithkumar K.2, Sreedevi S.C.2, Sreenivasa A.G.1 1College of Agriculture, University of Agricultural Sciences, Raichur-584 104, Karnataka, India 2Main Agricultural Research Station, University of Agricultural Sciences, Raichur-584 104, Karnataka, India *e-mail: savitha.path@gmail.com
Online Published on 11 January, 2024. Abstract Infected debris such as leaves, stem, petiole, and twig could be an important source of survival for the pathogens and a source of inoculum for the subsequent spreads from one season to the next and from one area to another area. This study was conducted to determine the length of survival of Phoma naikii in the infected pigeon pea debris under different storage conditions viz., room, refrigerator, pot, and field conditions. Under pot conditions, the samples were buried under 5 and 7.5 cm, and one set was placed on the surface of the soil. These samples were subjected to isolation at 15 days intervals and incubated at 25 ±2 °C. The observations were recorded for the growth and development of pathogens in the tissues after a week. The results revealed that the frequency of recovery of the pathogen decreased over time and the fungus was capable of overwintering for 23 weeks (% reduction was 86.66-6.66) in infected debris buried in sterilized soil regardless of burial depth. It has survived for 27 weeks (% reduction was 93.33-13.33) in field conditions, 30 weeks (% reduction was 100.0-20.0) on the surface of the soil, 34 weeks (% reduction was 100.0-20.0) in room conditions and 36 weeks (% reduction was 100.00-26.66) in the refrigerated conditions. Hence, the present study indicates the variation in the viability of the pathogen in the infected debris stored at six different conditions. Top Keywords Phoma naikii, Pigeon pea, Storage, Survival. Top |