European grapevine moth (Lobesia botrana Denis & Schiff.) (Lepidoptera: Totricidae) – occurence and management in Istrian vineyards

Provedeno istraživanje imalo je za cilj utvrditi dinamiku i pojavu leptira, zarazu gusjenicama i sumu efektivnih temperatura (S.E.T.) kod kojih se javljaju pojedine generacije pepeljastog grozdovog moljca (Lobesia botrana Denis & Schiff.) u uvjetima Istre u dva vinograda s različitom praksom suzbijanja štetnika. Štetnik je razvio tri generacije. Veći ulov leptira i napad treće generacije moljca na razini praga odluke utvrđen je u vinogradu u kojem se suzbijanje štetnika ne provodi. Temeljem ulova leptira na feromonima nije moguće donositi ispravne zaključke o visini napada gusjenica, a za ispravnu odluku nužni su vizualni pregledi. Korištenjem termalnog praga od 7 °C utvrđena je između 217,9 i 406,6 °C pojava leptira prve generacije. Druga generacija leptira leti između 786,3 i 1329,8 °C, a treća generacija između 1452,8 i 2108,2 °C.The aim of this paper was to identify European grapevine moths (Lobesia botrana Denis & Schiff.) flight dynamics, larvae occurrence and degree-day accumulations (DDA) for each moth generation in two Istrian vineyards with different pest management practices. The moth has developed three generations. During the third generation there was a significant flight peak in the vineyard without pest management. Predictions about larvae number and possible damage must be based on both, visual monitoring of grapevine and weekly adults catch. Developmental time with lower thermal threshold of 7 °C was calculated. The flight of the first generation was between 217.9 and 406.6 °C, second generation between 786.3 and 1329.8 °C, third generation between 1452.8 and 2108.2 °C