Survey for the assessment of arecanut yellow leaf disease (YLD) incidence in malnad region of Karnataka
Virupakshi Hiremata, Narayanaswamy M, Narayanswamy H, Satish KM
Arecanut is one of the most important commercial crops of coastal and malnad region of Karnataka. It is threatened by many diseases, of which yellow leaf disease is the major threat for the arecanut cultivation. The roving survey conducted during September 2018 in Sringeri and Koppa taluks of Chikkamagalur district of Karnataka. The incidence of YLD in arecanut plantations was ranged from 86.59 to 96.20 per cent. Among different villages of Sringeri and Koppa taluks surveyed, highest disease incidence was recorded in Muruvinakombe village (96.20%) followed by Talamakki (94.89%) and disease index was also highest in the Muruvinakombe (95.14 %) and followed by Talamakki (95.15 %). YLD incidence was comparatively more in certain varieties / hybrids where highest population of the plant hoppers found in that particular area. This could be attributed by the genetic composition of the cultivars grown in that area and the variation in the environmental conditions like temperature and relative humidity, vector population, cropping pattern and collateral natural hosts.