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What are the reasons of insect pest attack on forest trees?​

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Answer:

Enormous numbers and varieties of insects, fungi, BACTERIA, and viruses occur in forests and are adapted to live on or AROUND trees. Many of these are beneficial, and even the destructive ones are usually held in check by their natural enemies or an unfavourable environment. The normal POPULATION levels of pest organisms result in limited reduction in tree growth or the TOTAL destruction of only a small number of trees in the forest. The losses are generally accepted by foresters as UNAVOIDABLE and are tolerated as long as the annual destruction does not seriously affect the net annual increase in wood production.

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