Question

Cowpea mosaic virus is transmitted by

• A. Aphis craccivora
• B. Aphis gossypii
• C. Myzus persicae
• D. Bemisia tabaci

Hint:

Associate the cowpea aphid, Aphis craccivora, directly as the primary vector for Cowpea aphid-borne mosaic virus (CABMV) in pulse crops.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Plant viruses require specific insect vectors, such as aphids, whiteflies, thrips, or leafhoppers, to transmit the pathogen between host plants.
The cowpea aphid-borne mosaic virus (CABMV) is a highly destructive Potyvirus in pulse crops, and identifying its main vector is key to managing the disease.

Step 2: Detailed Explanation:
The Cowpea aphid-borne mosaic virus (commonly referred to simply as cowpea mosaic virus in standard Indian crop protection exams) is transmitted in a non-persistent, stylet-borne manner by aphid species.
Among these, {Aphis craccivora (the cowpea aphid) is the primary, most widespread, and highly efficient insect vector of this virus.
As A. craccivora feeds on infected cowpea plants, the virus particles adhere to its mouthparts (stylet).
When the aphid moves and probes healthy plants, it rapidly transmits the virus.
Managing the vector population of Aphis craccivora using systemic insecticides or botanical sprays like neem oil is essential to limit the spread of the mosaic disease in pulse fields.

Step 3: Final Answer:
Therefore, Cowpea mosaic virus is transmitted by Aphis craccivora.