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Background: Coriander (Coriandrum sativum L.) belongs to family Apiaceae is generally grown in winter season as a main crop in India. Stem gall of coriander caused by Protomyces macrosporus L. is a serious disease damaging all aerial plant parts. Under favourable ecological conditions, the disease may lead losses to the extent of 100 per cent therefore it is necessary to investigate the epidemiology of the disease to devise suitable remedial measures Methods: The field experiment was conducted during Kharif season of 2018 with two varieties to study the effect of different meteorological parameters on stem gall of coriander at different sowing dates (1st week of November to 1st week of December). The stem gall severity was recorded at weekly intervals from the start of its incidence. Result: The disease severity was lowest (5.42%) in the variety DH-36 sown in 3rd week of November and maximum disease severity (11.88%) was observed in variety DH-228 sown in 1st week of December. The quantitative relationship between the disease severity and weather variables at different dates of sowing for two varieties was obtained by performing correlation analysis. The temperature (maximum and minimum) and sunshine hours had positive correlation with per cent disease intensity, while relative humidity (morning and evening) and remaining weather parameters were non-significant at each dates of sowing but correlated with the disease intensity. [ABSTRACT FROM AUTHOR]

Stem gall of coriander caused by Protomyces macrosporus Unger. is a highly devastating seed and soil borne pathogen in coriander and has emerged as one of the major disease causing substantial quantitative and qualitative losses. In the present studies, efficacy of six bio-products, namely, Neemazal, cow urine, butter milk, fresh milk, beejamrit and jeevamrit was screened against mycelial growth inhibition of P. macrosporus under in vitro conditions. Extracts of these bio-products were evaluated at three different concentrations (i.e 10, 20 and 30%) by poison food technique. Results revealed that that among the various bio-products evaluated against test pathogen, irrespective of concentration tested, all the bio-products resulted in significant inhibition in mycelial growth of test pathogen with neemazal giving the complete inhibition [100.00 % (90.00)] followed by fresh milk [30.66 % (28.44)] and butter milk [26.55 % (25.99)], though these treatments were statistically different from one another. Different concentrations (10 to 30 %) of bio-products, irrespective of the treatments showed that 30 per cent concentration of all bio-products was most efficacious in inhibiting the mycelial growth of the test pathogen giving 69.95 per cent (36.77) growth inhibition. This was followed 20 and 10 per cent concentration of bio-products resulting in 55.58 per cent (32.49) and 45.53 per cent (16.30) growth inhibition, respectively. The result regardingevaluation of bio-products under in vitro conditions against the P. macrosporus showed that Neemazal treatment was most effective at all concentrations and completely inhibited the test fungus followed by 30 per cent fresh milk resulting in the mycelial growth inhibition of 51.60 per cent. [ABSTRACT FROM AUTHOR]

Coriander is a widely grown crop and suffers from various fungal, bacterial and viral diseases, of which stem gall caused by Protomyces macrosporus in predominant and destructive and of common occurrence. The disease appears in the form of tumour like swellings of leaf veins, leaf stalks, peduncles, stems and on fruits. Out of the seven fungicides tested in vitro, propiconazole, copper oxychloride and mancozeb were found the most effective and significantly superior among all the treatments with 100 per cent mycelial growth inhibition of the pathogen at 100 and 2000 ppm concentrations. Seed treatment of propiconazole and mancozeb was the most effective in managing the disease and also gave higher yield than the other treatments under field conditions. Foliar spray of hexaconazole and propiconazole resulted in 86.27 and 80.27 per cent disease reduction. The highest yield was obtained with hexaconazole giving 152.00 g followed by propiconazole with 143.33 g per 2 m². [ABSTRACT FROM AUTHOR]

One hundred two germplasm of coriander (Coriandrum sativum L.) were screened for resistance against stem gall, a severe disease caused by Protomyces macrosporus Unger. Out of 102 germplasm of coriander, thirty five germplasm of coriander showed moderately susceptible reaction to stem gall disease namely ND Cor-9,13, 14, 15, 18, 19, 20, 22, 23, 24, 25, 27, 34, 38, 49, 60, 61, 64, 65, 67,70, 71, 73, 76, 81, 82, 86, 88,94, 95, 96, 97, 98, 99, 101 whereas, sixty seven germplasm of coriander were observed susceptibility to stem gall disease of coriander e.g., ND Cor-1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 16, 17, 21, 26,28, 29, 30, 31, 32, 33, 35, 36, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 62, 63, 66, 68, 69, 72, 74, 75, 77, 78, 79, 80, 83, 84, 85, 87, 89, 90, 91, 92, 93, 100, 102. Minimum per cent disease intensity of 27.5% of stem gall disease was recorded in NDCor-18 and NDCor-76 whereas maximum per cent disease intensity of 82.5 was recorded in NDCor-32 showing maximum susceptibility among the germplasm. Rest of the germplasm ranged in between 25.0 - 82.5 % PDI. [ABSTRACT FROM AUTHOR]

Stem gall is one of the most important diseases of coriander. The effects of different temperature (15-35°C) and moisture levels (15-75 per cent) was studied on the development of stem gall of coriander caused by Protomyces macrosporus plants grown under controlled conditions. Results revealed that disease development was maximum (77.50%) at 25 °C soil temperature followed by 30°C temperature giving 52.50 per cent disease incidence and 30.00 per cent disease severity, while very low and high temperature were not favourable for development of disease. In other experiment on different moisture regimes, 45 per cent of soil moisture level was favourable for disease development and resulted in 70.25 per cent disease incidence and 35.25 per cent disease severity. Very low and very high soil moisture levels were not favourable for disease development. [ABSTRACT FROM AUTHOR]