Spatial dynamics of citrus mealybug Planococcus citri Risso at medium high altitudes of Meghalaya.
Various regression equations were used to study the spatial distribution of P. citri on 10-year-old Citrus reticulata trees grown in Meghalaya, India. Dispersal indices were calculated from January to December [year not given]. The population of P. citri increased gradually from January to October, then decreased thereafter. The lowest number of colonies was observed in December and January (severe winter period). The spatial distribution of P. citri followed a negative binomial model with an Iwao's regression equation.