FORESTRY
GENERAL FORESTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Dutch Elm Disease is capable of damaging even healthy trees because:
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native species have little or no resistance to the disease
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it is caused by air borne organisms and is impossible to control
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it attacks the entire tree all at once
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none of these
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Explanation:
Detailed explanation-1: -Hosts-This disease affects trees in the elm family (Ulmaceae). Native elms are most susceptible. infected through root grafts and those infected via beetles. Trees infected by root grafts wilt, their leaves turn brown, and the trees die rapidly, usually in the spring (fig.
Detailed explanation-2: -Pathogen spread through root grafts may result in wilt development in nearby trees in subsequent years; trees infected through root grafts usually wilt more quickly than bark beetle-related infections. The fungus produces microscopic fruiting bodies that are not visible in the field.
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