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KiRiTANi et al. (1970) have suggested that the population density of the green rice leafhopper, IVlaphotettix cineticops UHLER, is regulated through several densitydependent processes which operate at diffbrent levels of the population density. From the viewpoint of pepulation regulation, the mortality factors should be evaluated first by their degree of dependency on the population density, secondly by their order in the sequence of mortality agents and finally by their interactions with other factors (SoLoMoN, I964; MoRRIs, l965). It has been stated in a previous report (KiRrTANi et al., 1970) that the occurrence of egg mortality was density-dependent. The major mortality factors during the egg stage may be namecl as fo11ows: failure to hatch, parasitism and fungus diseases, As these mortality factors operate contemporaneously or one after another

applied entomology and zoology

Evaluation of Mortality Factors with Special Reference to Parasitism of the Green Rice Leafhopper, Nephotettix cincticep UHLER (Hemiptera : Deltocephalidae)