مرکز منطقه ای اطلاع رساني علوم و فناوري - DAMAGE RATIO OF HAZELNUT WEEVIL (Curculio nucum L. Col.: Curculionidae) ON DIFFERENT HAZELNUT VARIETIES

Abstract :

A total of 138 nut samples collected from 68 orchards in 2010 and 70 orchards in 2011 from 6 different hazelnut producing provinces in Turkey were analyzed in laboratory to determine the damage of hazelnut weevil (Curculio nucum L.) on the fruit. We paid attention to select the collected samples from Çakıldak, Foşa, Karafındık, Palaz, Sivri, Mincane and Tombul varieties which are intensely produced and are suitable for hazelnut processing industry. Analyzed fruits were classified as “prematurely dropped nuts that are light brown in color and shrinked at the bottom type damage”, “well-developed in size and grey-black in color nuts without kernel type damage” and “perforated fruit” which are known to be the harms of hazelnut weevil. Considering two-year total damage, it was found that hazelnut weevil mostly damaged Foşa cultivar (5.09%) followed by Mincane (4.57%), Sivri (3.81%), Palaz (2.80%), Çakıldak (2.80%), Tombul (2.77%) and Karafındık (2.48%). Chi-square (χ^2) analysis was performed to determine the difference between the cultivars in terms of total damage ratio and it was found that there was no difference between the cultivars in terms of hazelnut weevil damage ratio (P=0.904).