Which one of the following is not correctly matched

Wheat - Phalaris minor
Potato - Late blight
Bajra - Ergot
Sugarcane - Powdery mildew

The correct answer is (a). Wheat is a cereal crop that is not susceptible to Phalaris minor, a type of grass that is a weed in wheat fields. The other options are all correctly matched.

  • Potato – Late blight: Late blight is a fungal disease that can cause severe damage to potato crops.
  • Bajra – Ergot: Ergot is a fungal disease that can cause grain to become infected and produce a toxic substance.
  • Sugarcane – Powdery mildew: Powdery mildew is a fungal disease that can cause white powdery spots on the leaves of sugarcane plants.

Phalaris minor is a type of grass that is a weed in wheat fields. It can compete with wheat for water and nutrients, and it can also harbor diseases that can infect wheat plants. Wheat is not susceptible to Phalaris minor, so this is not a correct match.