OBJECTIVE LIFE SCIENCE
ECOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
25
|
|
|
30
|
|
|
20
|
|
|
50
|
Detailed explanation-1: -Oak wilt is usually identified in red oaks by rapid leaf discoloration and wilting. Often the initial symptom is a subtle off-green color shift that may be visible in the upper portion of the tree crown. This symptom is apparent in the northern part of the disease range in late June to early July.
Detailed explanation-2: -Oak wilt is first observed near the top of the tree. Browning and bronzing of the leaves from the margins toward the petiole are the first symptoms of oak wilt. Eventually the leaves will drop prematurely and the tree will die. White oaks are moderately resistant to oak wilt.
Detailed explanation-3: -Origin of Oak Wilt Oak wilt was first discovered in Wisconsin in 1944, but where it originated is still unknown. It has spread throughout the Midwest and Texas and has killed tens of thousands of trees in the U.S.