Im.of.climate change disease


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this ppt contains impact of climate on disease of plants.

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Im.of.climate change disease

  1. 1. @ ML Murugan
  2. 2.  Temperature Humidity and precipitation Light Wind @ ML Murugan
  3. 3.  Several research studies have indicated that many crop plants may not be infected under certain temp conditions. It has been found in diff. rice varieties Rice blast (night temp at 26c) Temp variation ..though the cooling of leaves by drops has not shown to have any effect on the parasitic diseases. @ ML Murugan
  4. 4.  Various fungal disease are influenced by temp,therefore,the development of disease stops under extremely low and high temperature conditions @ ML Murugan
  5. 5.  It is an important role in the incidence of pests and diseases. Soil moisture content has great influence on the severity of soil borne diseases and the depth of the existence of pest living in the soil. Cooling of the leaves at night is caused by the emission of infra-red radiation from the leaves. Most parasitic fungi of foliage are believed @ ML Murugan
  6. 6.  To require free water for sore germination. Some fungi can be germinate in h.humidity in the absence of free water. @ ML Murugan
  7. 7.  Full day light reduces the germination or growth of plant pathogens but many fungi germinate better in light of moderate intensity than in complete darkness.(powdery mildew) On the other hand,the germination of certain rusts may be much greater in darkness than in light. @ ML Murugan
  8. 8.  It has direct & indirect effect on the crop plants.cold and hot winds can cause chilling and sunburn,where as,strong winds can cause soil erosion,high desiccation and mechanical injuries to the plants. Wind act as carrier of insects from place to place and transport many diseases through the insects. @ ML Murugan
  9. 9.  It is the period in which infection has taken place but symptoms do not occur. Temperature influences the latent period. It depends on: nature of pathogen type of host environmental conditions @ ML Murugan
  10. 10.  It is the period from appearance of symptoms to the release of spores. It is also influenced by weather variables. Eg:infection period of peanut rust is influenced by temperature. @ ML Murugan
  11. 11.  Climate conditions are favourable for the wheat rust to servive in the himalayan region during summer season on the host plant of barberry.nepal(source region of rust-during summer) Nilgiri hills in south india are the source region of wheat rust. @ ML Murugan
  12. 12.  Wheat rust appears in in north-west india when there exist favourable weather conditions. It can be divided into three types @ ML Murugan
  13. 13.  Due to low temperature(confined to northern parts of India).the weather conditions become favourable for the appearance of rust by the end of January. Air temperature between(9-13∘c) R.humidity more than 70% There must exist partly cloudy conditions. @ ML Murugan
  14. 14.  It can survive over a wide rage of temperature. (northern&southern hills are the regions).it appears in punjab during the month of february. Air temp between 15-20°c R.humidity should be more than 70% Intermittent cloudiness must exist in the end of january or 1st week of february. @ ML Murugan
  15. 15.  It can survive in the northen hills throughout the summer season.(source is nilgiri hills) End of february –mid march only it can appears. Mean air temperature between 16-27°c R.humidity should be 70% There should be excessive dew @ ML Murugan
  16. 16.  During winter season, western disturbances cause cloudiness,rains,dew and fog over north india.when It become favourable ,late blight of potato appears. During summer season,incidense of late blight of potato is common in hilly regions. @ ML Murugan
  17. 17.  The weather conditions which are favourable for the incidence of many rice diseases. @ ML Murugan
  18. 18.  Min temp. should be less than 26°c R.humidity should be more than 90%. If these conditions prevail during the period of seedling,tillering and ear emergence, then the disease is likely to appear. @ ML Murugan
  19. 19.  Temp. range between 19-37°c in summer, 17-26°c in winter season. High relative humidity should persist. Irrigated conditions is more susceptible to this disease. @ ML Murugan
  20. 20.  There should be excessive rainfall during the reproductive period. High humidity & lower temperature should persist. @ ML Murugan
  21. 21.  Temperature should between 30.4-32.7°c Relative humidity between 86-93 % Sunshine hours should range between 3.3-7.8 hrs per day These conditions adversely affect the spread of the disease. @ ML Murugan
  22. 22.  Leaf spot it is an important disease of groundnut. It may be two types early leaf spot and late leaf spot. This disease is more common in those areas, where groundnut cropping system is existing. Early leaf spot - can appear few weeks of sowing(damage 10-15%) @ ML Murugan
  23. 23.  Leaf wetness is also one of the causes of these disease.(higher in kharif season)due to dew, fog and rainfall Favorable temp(22-35⁰c) @ ML Murugan
  24. 24.  It may appear at any phonological stage of the crop. it is influenced by temperature conditions, leaf wetness and high humidity. Fav.conditions(temperature at 24c,r.humidity 87%,intermittent rain fall) @ ML Murugan
  25. 25.  Temperature around 20-25c High and prolonged rainfall Intermittent cloudiness & dew Strong winds are favourable for disease spread @ ML Murugan
  26. 26.  It appears at flowering and podding stage in the form of pycinia and germinates at 17-22c and infect other plants forming either Secondary aecia or uredia depending upon prevalent temperature of 25c @ ML Murugan
  27. 27.  It appers at the larger stage of the crop during rainy season.intermittenet rains are favourable for the disease development. Tempv22.5-23.5c R.humidity between 77-86% Sunshine more than 5 hrs Should me more no. of rainy days. @ ML Murugan
  28. 28.  temp at 20-25c R.Humidity should be around 92% during rainy seasons. Cloudy weather. @ ML Murugan
  29. 29.  IPCC, 1996a. Climate Change 1995: The Science of Climate Change. @ ML Murugan
  30. 30.  Kattenberg A., Maskell, K. (Eds.), Contribution of Working Group I to the Second Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridgeetc. @ ML Murugan
  31. 31. @ ML Murugan