An Investigation on the Effect of Meteorological Parameters on Sunn Pest Occurrence In khorram-Dareh Region of Zanjan province

Wheat as the most important crop has invaded by many pests. The sunn pest is one of the most important pests of wheat. In this study, the relationship between meteorological parameters including temperature, precipitation, wind, etc with the sunn pest have been invistaged in Khorramdareh (Zanjan province of Iran) during the growing seasons of 2012-2013 to 2018-2019 years. The results showed that there was a highly significant correlation between the date of onset of slaughter of sunn pest with temperature of pre-emergence period especially in winter, population density, maternal age, nymphs, as well as peak height and spawning time. The sunn pest outbreaks are more likely occurs with increasing temperature, therefore conditions are provided for feeding and early oviposition of the pest, in years with higher temperature in the late winter and early spring and lower number of annual frosty days and extreme frost in winter. The results of this research indicated that there was a significant relationship between the pest density and temperature, precipitation, and wind velocity. The most impacted parameters on the sunn pest is the winter temperature, so that by increasing and decreasing the amount of this meteorological parameter sunn pest increases or decreases and its outbreak or blackout occurs accordingly in the upcoming year.