- مبلغ: ۸۶,۰۰۰ تومان
- مبلغ: ۹۱,۰۰۰ تومان
Pulvinaria aurantii is one of the most important pests of citrus trees in the north country. Changes in population and spatial distribution of citrus pulvinaria aurantii, with using the counting method in spring and summer in the north country was conducted in 2013. The most common methods of sampling this pest is counting. Activity of this pest continue in the second half of may until early october. The highest average population in nymphs age equal to 2.697 has been observed. To determine the spatial distribution of the indexes Taylor index, Murysta index and index of dispersion is used. Often in pest the observed cumulative distribution in nymphs, it accumulation gradually reduced. But the configuration of the cumulative pest dispersion have been preserved in most indicators related to population, not all of them. In indicators mentioned evaluation test were done, and most important cases significant indicator is calculated. The results of this study can be used to manage populations of pulvinaria aurantii.