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. , Fox , S. L. , Hucl , P. , Singh , A. K. and Stevenson , F. C. ( 2014 ): Root rot severity and fungal populations in spring common, durum and spelt wheat, and Kamut grown under organic management in Western Canada . Can. J. Plant Sci. 94

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Njukeng, P. A. (1994): Effects of virus-free cassava clones on the incidence and severity of African Cassava Mosaic Disease. M. Sc. thesis, Dept. of Agricultural Biology, University of Ibadan, Ibadan, Nigeria. 70 p

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A survey was carried out in the 1996/97 and 1997/98 growing seasons on a field planted in three replicates with five clones of cassava at the International Institute of Tropical Agriculture, Ibadan, located in a transition forest, to determine the effects of cassava genotype and climate on the development of African cassava mosaic geminivirus (ACMV) and changes in the Bemisia tabaci population. Cassava genotype, climate and their interactions have significant (P<0.01) effects on the population of B. tabaci and the development of ACMV. The incidence of ACMV was significantly (P<0.01) higher in clones 81/01635 and 92/0520 than in TMS 30572 and 94/0239, while 91/02327 showed the greatest resistance. A positive correlation between the incidence and severity of ACMV was observed, but this did not correlate with the whitefly population density.

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References Ahmed , F. , Hossain , I. , Aminuzzaman , F.M. 2003 . Effect of different pathotypes of Bipolaris sorokiniana on spot blotch severity and yield

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. L Zhang RL Tarleton 1999 Parasite persistence correlates with disease severity and localization in chronic Chagas’ disease

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of cereal pathogens . Plant Pathol. 36 : 201 – 213 . Shaw , M.W. , Royle , D.J. 1993 . Factors determining the severity of epidemics of Mycosphaerella graminicola

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Aspergillus niger was found to be the predominant pathogen associated with black mould rot of onion during storage. Market survey for the assess­ment of spoilage caused by the fungus recorded a loss of 2.9% to 12.09% during the period from June 1998 to February 1999. Application of higher doses of calcium in the form of gypsum (400 kg/ha) and lower dose of nitrogen in the form of urea (50 kg/ha) to the field and advancing the harvest of onion bulbs by fifteen days significantly reduced the spoilage of bulbs during storage. An inverse relationship existed between neck length of the bulbs and spoilage at storage. Bulb rotting was noticed when the storage temperature was between 30 °C and 40 °C and the relative humidity was above 80%. Further, A. niger infection caused reduction in pungency of onion bulbs which was more pronounced at grade 4 than grade 1. The culture filtrates of Aspergillus niger and Asper­gillus flavus isolated from onion as well as the extracts from onion bulbs infected with the above fungi were free from aflatoxin contamination.

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on potentially differing disease severity as measured by the outcome parameters, namely, death during hospital stay, duration of hospital stay, and infectious disease as the main diagnosis. Secondly, associations of resistance with the clinical course

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strains . Mycologia , 3 , 558 – 590 . De Capdeville , G. , Maffia , L. A. , Finger , F. and Batista , U. G. ( 2005 ): Pre-harvest calcium sulfate applications affect vase life and severity of gray mold in cut roses . SciHortic

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. Fiorilli , V. , Catoni , M. , Francia , D. , Cardinale , F. , Lanfranco , L. ( 2011 ). The arbuscular mycorrhizal symbiosis reduces disease severity in tomato plants infected by Botrytis cinerea . J. Plant Pathol. 93 , 237 – 242

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