B. R. Khadge
Plant Pathology Division, Khumaltar, Lalitpur

Abstract

Root and soil samples of citrus (Citrus reticulate Blanco) were collected from Baitadi area. Twenty nine samples were processed to find out the number and types of mycorrhizal spores and root samples were processed to find out percent root colonized by mycorrhizae. The percent root colonized by VAM fungi ranged from 27 to 92. The higher percentage colonized roots indicated healthier roots. It also indicated that the soil condition for the symbiotic relation was good. The percentage of root colonized by VAM was less on the sample indicated as diseased one. There was positive correlation between number of spores and percentage root colonized by VAM fungi. The diseased root, in general had lower root colonization. Number of spores in 200 grams of soil ranged from 165 to 6089. Two soil samples had very high spore population, 27 and 30 spores per gram soil. Predominantly Glomus spp. was found in most of the soil sample. Other genuses found were Gigaspora, Scutellospora, Sclerocystis and Acaulospora.