Comprehensive Resources for Agriculture: Topical Questions, Past Papers, and Answers
Atika School
Various Classes of Crop Diseases and ExamplesGiving one example in each case, identify the various classes of crop diseases
Detailed Answer: Bacterial diseases are a class of crop diseases caused by bacteria. One example of a bacterial disease is Halo blight, which affects beans and is caused by the bacterium Pseudomonas syringae. Another example is Fusarium wilt, which affects a variety of crops including tomatoes, bananas, and cotton. Fungal diseases, on the other hand, are caused by fungi. One example of a fungal disease is maize smuts, which affects corn plants and is caused by the fungus Ustilago maydis. Another example is rice blast, which affects rice plants and is caused by the fungus Magnaporthe oryzae. Rusts, such as wheat rust, coffee Berry disease, and panama disease, are also examples of fungal diseases. Viral diseases are caused by viruses and can have a devastating impact on crops. One example is mosaic disease, which affects a wide range of plants including tobacco, tomatoes, and cucumbers. Another example is maize streak virus, which affects corn plants. Other viral diseases include rosette disease, Ratoon stunting, greening diseases, cassava mosaic, brown streak of cassava, potato leaf roll, and groundnut rosette. Nutritional disorders are a class of crop diseases that result from a lack of one or more necessary plant nutrients. One example is blossom end rot in tomatoes, which is caused by a calcium deficiency in the plant. This disorder causes the fruit to develop black, sunken areas on the blossom end. In conclusion, crop diseases can be classified into different classes including bacterial diseases, fungal diseases, viral diseases, and nutritional disorders. Each class has its own unique examples and can have significant impacts on crop health and yield.
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