Effects of climatic change of food conditions and population dynamics of forest insects

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Many studies have discussed the effects of climatic change caused by global warming on herbivorous invertebrate populations, but few studies have enough data on the relationship between insect and host plants in the field. This study tried to know the effects of climatic changes caused by human activities on food condition and population dynamics of insect population. Two climatic changes were treated, one was global warming and the other was acid rain. Relationship between phenology of maple trees and population dynamics of an aphid was analyzed and it was ascertained that phenology of host tree has a strong influence on insect population. Population dynamics of the insect can not understood well without the information of the phenology of the host tree. As winter chill determines the thermal sum to spring bud burst, global warming has a possibility to cause a strong adverse effect on bud burst phenology on maples and also on insects.Defoliation of pine moth decreased the amount of current needles of pine. But, acid rain increased the amount of needles. The two factors, defoliation and acid rain, had interactions.