Exam 4

Question 1

The environment during graft healing is important because we are encouraging new cell growth.
The temperature range should be:

Answer 1

55-90 degrees Fahrenheit

Question 2

During graft healing, if exposed to drying air the graft will not take.

Answer 2

True

Question 3

Until vascular connections are formed between rootstock and scion, what provides the initial pathway for water?

Answer 3

The callus bridge

Question 4

When should outdoor grafting generally take place?

Answer 4

Spring, when favorable temperatures are expected.

Question 5

During high temperature conditions whitewashing the graft union area promotes what?

Answer 5

Healing

Question 6

How does whitewashing promote healing?

Answer 6

The whitewash reflects the light and keeps the graft union area cooler.

Question 7

What are some factors that influence graft healing?

Answer 7

Incompatibility 
Kind of plant
Environment
Growth of stock plant
Grafting technique 
Viral diseases or insect contamination 
"Bleeding" (excessive sap flow)

Question 8

What is “bleeding”?

Answer 8

A process in which a plant has strong root pressure that causes excess sap flow that can reduce grafting success.

Question 9

How can “bleeding” be overcome?

Answer 9

Can be overcome by making slanting knife cuts (through the bark and into the xylem) below the graft.