Researches Regarding the Attack Produced by Curculio glandium Marsh. in Production Unit II Badacin Belonging to the Simleul Silvaniei Forestry Department

Among the species of insects that attack acorns the most common are Curculio glandium Marsh. (acorn weevil) and Cydia (Laspiresia) amplana (rusty oak moth). The larvae of Curculio glandium chewirregular galleries in the oak acorns, transforming the acorn cotyledons into a crumbly mass filledwith black excrements. Content acorns partially consumed by one larva, or are chewed entirely by twolarvae. In the period 2011-2012 we proceeded to monitor the frequency of attack at acorns, producedby Curculio glandium. The research was conducted in 2011-2012 in production unit II Badacin, unit thatbelongs to Simleul Silvaniei forestry department. In order to evaluate the frequency of attack producedby the acorn weevil, Curculio glandium, in three cantons (Magura, Giurtelec and Cehei) was determinedthree control points. Selected trees are: sessile oak Quercus petraea and pedunculate oak Quercusrobur. In 2011 in the Magura canton from the total acorns analyzed 304 were attacked by Curculio glandium. In Giurtelec canton in 2011 the frequency of acorns attacked by Curculio glandium was 52.4% and in Cehei canton the frequency of attacked acorns was 52.3%. In 2012, in Magura canton 51.8% of the total acorn were attacked by Curculio glandium. In the canton ofGiurtelec the frequency of attacked acorns by Curculio glandium is 62.7% and in Cehei canton thefrequency of attacked acorns is 51.2%. In all the cantons it was found an increase in frequency of attackfrom the basis of the slope to the top of the slope.