Question

San Jose Scale is devastating to the crop:

• A. Papaya
• B. Banana
• C. Grape
• D. Apple

Hint:

San Jose Scale (Quadraspidiotus perniciosus) is an internationally quarantined pest. Associate it directly with temperate fruits, primarily Apple.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
San Jose Scale, scientifically known as Quadraspidiotus perniciosus, is an insect pest belonging to the family Diaspididae (order Hemiptera).

Step 2: Detailed Explanation:
This insect is a highly destructive pest of temperate deciduous fruit crops globally.
It is particularly devastating to apple orchards (and also affects pears, peaches, and plums).
Both nymphs and adults suck sap from twigs, branches, leaves, and fruits, injecting a toxic saliva that causes reddish discoloration of the bark and tissues, leading to decline in tree vigor and fruit quality.

Step 3: Final Answer:
The crop most devastated by San Jose Scale among the options is apple, which is option (D).