Gonioctena fornicata (Brüggemann, 1873) (Coleoptera: Chrysomelidae)’nin Bolu, Zonguldak ve Bartın illeri yonca alanlarında yayılışı, yoğunluğu ve popülasyon takibi

This study was conducted to survey the distribution and density of alfalfa leaf beetle [(Gonioctena fornicata (Bruggemann, 1873) (Coleoptera: Chrysomelidae)] in alfalfa (Medicago sativa L.) cultivation areas in Bolu, Zonguldak and Bartin provinces between 2017 and 2019. It was determined that the prevalence of Gonioctena fornicata was 100% in three provinces where studies were conducted in 2017. It was observed that the rate of infestation of G. fornicata started at 2.24% in 2018, and rose to 44.82% in 2018. In 2019 infestation rate began at 1.48% and rose to 36.86%. It has been determined that the infestation that started with the end of March continued until the end of June. This study highlights the infestation time and distribution of G. fornicata in the provinces of the Western Black Sea Region, and can serve as a building block for further investigations of G. fornicata’s distribution in the area.