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1. State two possible causes of swelling on the roots of legume crops
2. Discuss the various cultural methods of controlling pests in crops
3. What does the term ‘close season’ mean in crop production?
4. Explain five cultural methods of pest control in stored grains  Â
5. Name four symptoms of viral infections in plants
6. Study the illustrations given below and then answer the questions that follow:-
7. State the various practices carried out in the field to help control crop diseases
8. State two ways in which pesticides kill crop pests
11. Define the term ‘economic injury level of a pest and integrated pest control management Â
12. List four harmful effects of crop pests                                    Â
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