Studies on Variability on Different Fungicides in the Growth of Twenty Isolates of fusarium Oxysporum f.sp. ciceri causing Vascular Wilt of Chickpea

Field survey was undertaken and seventy one samples of chickpea wilted plants were collected from twenty three locations in different districts namely, Bhopal, Raisen, Rajgarh, Sagar, Sehore and Vidisha of Vindhyan Plateau Zone of Madhya Pradesh. Out of seventy one isolates, only twenty were found pathogenic to chickpea. These isolates were categorized into six different groups on the basis of colony diameter, growth pattern and number of micro and macro conidia. The physiological studies of the representative isolates of these six groups were made on six different fungicides at 1000 ppm concentration. All the fungicides differed significantly from each other. The minimum mean radial growth (39.68 mm) was recorded in groups 5 of isolates Ri4, Ri5 and V2 and maximum (41.04 mm) in group one consisting of B2, B3, Se 6 and Se 8. The maximum mean radial growth (84.46 mm) was obtained on untreated control and minimum (15.36 mm) on Thiram. These isolates exhibited three types of growth pattern namely, fluffy partially submerged and submerged. The maximum number of micro conidia were produced on untreated (control) (7.58 million/ml) and minimum (1.29 million/ml) on Thiram. Similarly, the maximum number of macro conidia were produced on untreated control (2.67milion/ml) and minimum (0.19 million/ml) on Thiram.