Studies on population dynamics of Balaninus nucum L. (Col., Curculionidae) noxious to the hazel (Corylus avellana L.) in northern Latium (Central Italy)
1992
Pucci, C. (Tuscani Univ., Viterbo (Italy). Dipt. di Protezione delle Piante)
The author reports on the results of a study concerning basis research carried out with the aim of defining guided and integrated methods for the control of the key insect of the hazel-grove agro-ecosystem, Balaninus nucum L. (Col., Curculionidae). The researches carried out in a hazel grove typical for Northern Latium (Central Italy) allowed to investigate a number of aspects of the population dynamics of adults and of preimaginal instars, to define the duration of embryonal and post-embryonal development and to ascertain the extent of damages. Moreover, highly significant correlations were found between the number of egg-bearing females and percentage of oviposition detected in the fruits, and between the average number of egg-bearing females and percentage of hazel-nuts with eggs. The information reported in this paper will be verified in other hazel-growing environments, so as to formulate an economic threshold for treatment calling for the use of more suitable chemicals, less detrimental for the equilibria of the biotic community
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