slovenski

Netipični škodljivci na vrtninah v Istri

Changes in vegetable production systems in Croatia, respectively introducing intensive monoculture growth has a consequence of big change on fauna in production areas. Population dynamics of each species is changing, and some less known species are starting to show up through strong pest like populations which are creating a problem for treatments. As it refers to species which bionomy Croatia ecological areas are less known, it is necessary to identify them and determine circumstances for their development in order to predict their show up and in rational ways prevent them from creating damage to the least possible measure. The species Helicoverpa armigera Hübner, cotton bollworm was determined in 2003 and 2004 on west Istria on vegetable plots in a massive population. By monitoring the larvaes on tomato and sweet pepper we estimated the place and share of damaged fruits. Damaged fruits of tomato and sweet pepper were noticed in the surroundings of Poreč and Rovinj in 2003, while damages on tomatoes were noticed in river Mirna valley in 2003 and 2004. The mean loss of yield due to damage on the tomato fruits in 2003 in Poreč was between 33% and 37%. In river Mirna valley, this loss was 42% (2003) and 13% (2004). The most of larvaes on tomatoes were 15 to 40 mm long, while on sweet pepper they were 30 mm long. Also in 2004 we determined the appearance of Beosus maritimus (two-spotted ground bug) on cabbage leftovers. Also this bug usually causes no damage on cabbage because it is feeding on dead organic matter ; therefore its appearance caused panic among inhabitants in Vrsar. On the road Vrsar-Limski canal hordes of bugs were crossing the road and creating a slippery and smelly mass.

južna plodovrtka; Helicoverpa armigera Hübner; Beosus maritimus; vrtnine; Istra; Hrvaška

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