population dynamics of the citrus nematode tylenchulus semipenetrans in an infested orchard in fars province, southern iran

The citrus nematode tylenchulus semipenetrans is considered one of the most significant threats to citrus production worldwide. effective management of this pathogen requires an understanding of its population dynamics. in this study, seasonal fluctuations and population peaks of the citrus nematode were examined in fasa, one of the main citrus-producing regions in fars province, southern iran, during the years 2018-2019. to monitor the nematode population density and dynamics, soil and root samples were collected on a monthly basis. the results of this study showed that there are two annual population peaks in the orchards of fasa. the highest nematode population in the soil was observed at the end of may and in december, while the highest root population was observed at the end of may and october-november. the lowest population levels in the soil (second-stage juveniles and males) and in the roots (eggs, juveniles, and females) were recorded in july. the study revealed that population fluctuations in the roots, especially females, were less than in the soil. additionally, in most samples, nematode density decreased as the distance from the tree trunk increased. these findings highlight the importance of understanding the nematode population dynamics to implement effective management strategies during population peak periods.

population dynamics of the citrus nematode tylenchulus semipenetrans in an infested orchard in fars province, southern iran

the citrus nematode tylenchulus semipenetrans is considered one of the most significant threats to citrus production worldwide. effective management of this pathogen requires an understanding of its population dynamics. in this study, seasonal fluctuations and population peaks of the citrus nematode were examined in fasa, one of the main citrus-producing regions in fars province, southern iran, during the years 2018-2019. to monitor the nematode population density and dynamics, soil and root samples were collected on a monthly basis. the results of this study showed that there are two annual population peaks in the orchards of fasa. the highest nematode population in the soil was observed at the end of may and in december, while the highest root population was observed at the end of may and october-november. the lowest population levels in the soil (second-stage juveniles and males) and in the roots (eggs, juveniles, and females) were recorded in july. the study revealed that population fluctuations in the roots, especially females, were less than in the soil. additionally, in most samples, nematode density decreased as the distance from the tree trunk increased. these findings highlight the importance of understanding the nematode population dynamics to implement effective management strategies during population peak periods.