Future Strategies and Priorities for the Management of Alternaria Diseases of Crucifers
With the increasing demands of a growing global population, there has been a significant change in cropping patterns of edible and industrial oil-yielding crucifers as well as vegetables. In the absence of host resistance, intensive cultivation has result
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With the increasing demands of a growing global population, there has been a significant change in cropping patterns of edible and industrial oilyielding crucifers as well as vegetables. In the absence of host resistance, intensive cultivation has resulted in perpetuation, build-up and dissemination of Alternaria species on crucifers in areas where these crops are grown. The main factors responsible for the increase of inoculum of pathogenic Alternaria to the present level include the lack of genetic sources of resistance, cultivation of susceptible crops with high plant density, use of irrigation with high rates of nitrogen fertilizers, contiguous areas under monoculture, staggered sowing dates, poor weed management and poor plant protection strategies. The information gathered in this book on Alternaria diseases of crucifers indicates that some gaps and bottlenecks still exist in our comprehensive understanding of various dimensions of Alternaria–host pathosystem; some of these are highlighted below to be resolved priority wise in areas of crucifer production.
13.1
Disease Epidemiology and Forecasting
Factors governing disease development and consequent progression are not completely understood. Deeper insight with regard to various epidemiological aspects will help to develop strategies to curb the progression of these poten-
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tial diseases. There is an urgent need to carry out intensive investigation with regard to the environmental parameters responsible for causation and spread of diseases under field conditions. Multilocational trials with staggering dates of planting could be helpful in analysing disease development in relation to environment by computing disease progression at regular intervals. These efforts could be undertaken to study various disease prediction models (geophytopathological, bioclimatic, simulation system analysis, etc.) which could play a meaningful role in developing an effective disease control strategy.
13.2
Physiological Specialization
Identification and standardization of host differentials are fundamental prerequisites to the gathering of meaningful information on races/ pathotypes. This is a high-priority area of investigation. Designation and nomenclature of pathotypes should be uniform, logical and internationally acceptable. Virulence genes may be identified.
13.3
Genetics of Resistance
Although we have some information on genetic sources of resistance, the information on the nature, mechanism and inheritance of resistance
© Springer Science+Business Media Singapore 2016 G.S. Saharan et al., Alternaria Diseases of Crucifers: Biology, Ecology and Disease Management, DOI 10.1007/978-981-10-0021-8_13
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Future Strategies and Priorities for the Management of Alternaria Diseases of Crucifers
are still not satisfactory and/or lacking. The results of this area of investigation are an important prerequisite to incorporate stable and effective sources of resistance in breeding programmes. In diseases caused by Alternaria species, where major gene resistance is n
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