Natural control of populations of the southern green stink bug,Nezara viridula |
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Authors: | Keizi Kiritani |
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Institution: | (1) Asso Research Station, Wakayama Agricultural Experiment Station, Asso, Nisimuro-gun, Wakayama, Japan |
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Abstract: | Summary Based on the results of five-year study on theNezara population, it was concluded that the level of abundance of the insect was determined partly by the combination and relative
adundance of the host plants and partly by the climatic factors. The endless increase of the population was checked by the
deleterious effects associated with the overpopulation which occurred locally. The degree of such overpopulation was determined
by the relative abundance of host plants to the current level of the population. Therefore, even when the general level ofNezara population seemed to be low, there still exists the possibility of overpopulation in some areas.
Winter was the critical period which threatened the persistence ofNezara population. The survival of the hibernating adults was partly dependent on the physiological state of adults which was determined
in the period of pre-hibernation. But when the severity of a winter exceeded the tolerance limit of the insect, the only safety-valve
which prevented the elimination ofNezara was the heterogeneity of hibernacula. Therefore,Milne's theory (1957) was closest to the known facts. |
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