أعرض تسجيلة المادة بشكل مبسط
| dc.date |
2006-11-22 |
|
| dc.date |
2006-11-22 |
|
| dc.date |
1978 |
|
| dc.date.accessioned |
2013-10-16T07:42:09Z |
|
| dc.date.available |
2013-10-16T07:42:09Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/3488 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/3488 |
|
| dc.description |
Green ash windbreaks in North Dakota were surveyed in 1972 and 1976
to determine the incidence of attacks by the carpenterworm, ash borer,
and other stem-infesting wood borers. Windbreaks were stratified by
age and geographic region. In 1976, about 3.1 percent of the green
ash trees in North Dakota had new carpenterworm attacks, an increase
of 34.8 percent from 1972. The number of trees showing new attacks
by the ash borer declined in three out of four land resource areas
(LRA). Trees damaged by other borers declined in all LRA's but one.
Although some LRA's showed minor increases, the number of windbreaks
infested by the carpenterworm and ash borer declined by 41.6 percent
and 19.6 percent respectively.
Younger windbreaks were apparently more susceptible to attack by ash
borers while older ones were more frequently infested by the carpenterworm
and other borers. |
|
| dc.language |
en_US |
|
| dc.publisher |
Missoula, MT. : Forest Insect & Disease Management, USDA, Forest Service, Northern Region, State & Private Forestry |
|
| dc.relation |
Report (United States. Forest Service. Northern Region) |
|
| dc.relation |
no. 78-12 |
|
| dc.relation |
Forest insect & disease management |
|
| dc.title |
A survey to evaluate wood borers in green ash windbreaks in North Dakota |
|
| dc.type |
Technical Report |
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الملفات في هذه المادة
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لا توجد أي ملفات مرتبطة بهذه المادة.
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هذه المادة تبدو في المجموعات التالية:
أعرض تسجيلة المادة بشكل مبسط