Step 1: Woolly Aphid Identification.
The woolly aphid (Eriosoma lanigerum) is a globally significant pest affecting apple orchards.
It is characterized by the formation of white, wool-like waxy secretions on infested plant parts, which gives it its name.
Step 2: Symptoms of Infestation.
- Affects the roots, stems, and branches of apple trees.
- Leads to swelling, the development of galls, and cracking of the bark.
- Diminishes tree vitality, fruit production, and fruit quality.
Step 3: Evaluation of Host Plants.
- (1) Mango: Primarily affected by hoppers and mealybugs, not woolly aphid.
- (2) Apple: Correct. Woolly aphid is a major pest of apple trees.
- (3) Ber: Infested by fruit flies, not woolly aphid.
- (4) Guava: Subject to fruit fly, mealybug, and wilt diseases, not woolly aphid.
Step 4: Determination.
Therefore, the woolly aphid is associated with apple cultivation.