Question

"M-9" is a well-known dwarfing rootstock for which fruit crop?

• A. Mango
• B. Apple
• C. Pear
• D. Peach

Hint:

Remember: M-9 = Apple dwarf rootstock.

Answer 1

The Correct Option is B

Concept: Rootstocks are used in fruit crops to control plant size, improve yield, and enhance resistance to pests and diseases.
Step 1: Understanding dwarfing rootstocks.
Dwarfing rootstocks reduce the size of the plant, making management and harvesting easier.
Step 2: Identifying M-9 rootstock.
M-9 (Malling 9) is a widely used dwarfing rootstock.
Step 3: Crop association.
M-9 is specifically used in apple cultivation for high-density planting systems.
Step 4: Evaluating the options.

• Mango $\rightarrow$ Not associated with M-9 (incorrect)
• Apple $\rightarrow$ Correct
• Pear $\rightarrow$ Uses different rootstocks (incorrect)
• Peach $\rightarrow$ Not associated with M-9 (incorrect)

Step 5: Additional insight.
M-9 rootstock produces early-bearing trees with high productivity but requires support due to weak root anchorage.
Step 6: Conclusion.
Thus, M-9 is a dwarfing rootstock used for apple.