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WAEC Agricultural Science 2008 Question 37

Question 37

Crop Diseases

Which of the following combinations of practices best controls groundnut rosette disease?

  1. A.Late planting and spraying of insecticide
  2. B.Early planting and spraying of nematicide
  3. C.Late planting and spraying of fungicide
  4. D.Early planting and spraying of insecticide.
Show the answer and explanation

Answer: D (Early planting and spraying of insecticide.)

Explanation

Early planting avoids aphid peaks; insecticide kills the aphid vector.