U radu je istražen intenzitet zaraze različitih domaćina žutom imelom (Loranthus europaeus Jacq.) i bjelogoričnom bijelom imelom (Viscum album L. ssp. album) na području dvanaest šumarija UŠP Vinkovci i devet šumarija UŠP Nova Gradiška. Domaćini za koje je istraživanje rađeno bili su: hrast kitnjak (Quercus petraea /Matt./ Liebl.), hrast lužnjak (Q. robur L.), poljski jasen (Fraxinus angustifolia Vahl), crni orah (Juglans nigra L.), malolisna lipa (Tilia cordata Mill.), klen (Acer campestre L.), obični grab (Carpinus betulus L.), divlja kruška (Pyrus pyraster Burgsd.), obični bagrem (Robinia pseudoacacia L.) i kanadska topola (Populus ×canadensis Moench). Intenzitet zaraze bio je vrlo različit za pojedine odjele, gospodarske jedinice i šumarije.
Na području UŠP Vinkovci od ukupnog broja pregledanih stabala lužnjaka 7,6 % bilo je zaraženo imelom. Na zaraženim stablima prosječno su bila 2,5 grma imele, a najveći broj grmova na jednom stablu bio je 17. Najveća zaraza zabilježena je u GJ Vrapčana, Šumarije Vinkovci (20,1 %). Na području UŠP Nova Gradiška žutom imelom bilo je zaraženo 10,5 % pregledanih stabala lužnjaka. Na zaraženim stablima prosječno su bila 2 grma imele, a najveći broj na jednom stablu bio je 9. GJ Glovac-Renovica, Šumarije Trnjani, bila je znatno zaraženija od ostalih (35,5 %). Za UŠP Vinkovci prikazana je prostorna raspodjela intenziteta zaraze lužnjaka žutom imelom u šest najviše zaraženih gospodarskih jedinica. U usporedbi s prethodnim istraživanjima, intenzitet zaraze lužnjaka na području UŠP Vinkovci i Nova Gradiška veći je nego za UŠP Bjelovar, a manji nego za UŠP Požega.
Na kitnjaku je žuta imela praćena na području UŠP Nova Gradiška, gdje je imela zabilježena na 4,6 % pregledanih stabala. Na zaraženim stablima prosječno su bila 2 grma imele, a najveći broj grmova na jednom stablu bio je 5. Najveća zaraza zabilježena je u GJ Južni Dilj, Šumarije Slavonski Brod, gdje je 9,3 % pregledanih stabala na sebi imalo žutu imelu. U usporedbi s dosadašnjim istraživanjima, intenzitet zaraze kitnjaka na području UŠP Nova Gradiška veći je nego za UŠP Bjelovar, a manji nego za UŠP Požega.
Od ukupnog broja pregledanih stabala poljskog jasena na području UŠP Vinkovci, bijelom imelom bilo je zaraženo 2,7 %, prosječno su se na zaraženim stablima nalaza 2 grma imele, a najveći broj grmova po stablu bio je 5. Na području UŠP Nova Gradiška 7,3 % pregledanih stabala poljskog jasena bilo je zaraženo imelom, prosječno su na njima bila 4 grma imele, a najviše 60 grmova na jednom stablu.
Imele su sastavni dio šumskih ekosustava i ne predstavljaju poseban problem za svoje domaćine ako intenzitet zaraze nije velik. Iako varira postotak zaraženih stabala u pojedinim odjelima, odnosno gospodarskim jedinicama, važan je podatak da broj grmova žute imele na zaraženim stablima hrastova lužnjaka i kitnjaka nije velik (prosječno po 2 grma).The intensity of infection of different hosts with yellow mistletoe (Loranthus europaeus Jacq.) and white-berried mistletoe (Viscum album L. ssp. album) in the area of 12 forest offices of the Forest Administration Vinkovci and 9 forest offices of the Forest Administration Nova Gradiška was investigated. The investigated hosts were: sessile oak (Quercus petraea /Matt./ Liebl.), pedunculate oak (Q. robur L.), narrow-leaved ash (Fraxinus angustifolia Vahl), black walnut (Juglans nigra L.), small-leaved lime (Tilia cordata Mill.), common maple (Acer campestre L.), common hornbeam (Carpinus betulus L.), wild pear (Pyrus pyraster Burgsd.), common locust (Robinia pseudoacacia L.) and Canadian poplar (Populus ×canadensis Moench). The intensity of infection was very different in the individual compartments, management units and forest offices.
In the area of the Forest Administration Vinkovci from the total number of examined pedunculate oak trees 7.6 % were infected with yellow mistletoe. On the average on each of the infected trees there were 2.5 mistletoe plants, and the largest number on one tree was 17. The largest infection was noted in the Management Unit Vrapčana, of the Forest Office Vinkovci (20.1 %). In the area of the Forest Administration Nova Gradiška 10.5 % of the examined pedunculate oak trees were infected with yellow mistletoe. On the infected trees there were 2 mistletoe plants on the average, and the largest number of plants on one tree was 9. In the Management Unit Glovac-Renovica, of the Forest Office Trnjani, there was considerably more infestation than in other management units (35.5 %). For the Forest Administration Vinkovci the spacial distribution of mistletoe infestation intensity of the pedunculate oak in six most infested management units was presented. Compared with previous research, the intensity of mistletoe infestation of the pedunculate oak is greater in the area of the Forest Administration Vinkovci and Nova Gradiška than in the Forest Administration Bjelovar, and smaller than in the Forest Administration Požega.
On the sessile oak yellow mistletoe was investigated in the area of the Forest Administration Nova Gradiška, where mistletoe was observed on 4.6 % of the examined trees. On the infected trees there were 2 mistletoe plants on the average, and the highest number of plants on one tree was 5. The largest infestation was found in the Management Unit Južni Dilj, of the Forest Office Slavonski Brod, where 9.3 % of the examined trees were infected. Previous researches show that the intensity of mistletoe infestation of the sessile oak in the area of the Forest Administration Nova Gradiška is greater than in the Forest Administration Bjelovar, and smaller than in the Forest Administration Požega.
Out of the total number of examined narrow–leaved ash trees in the area of Forest Administration Vinkovci, 2.7 %, were infected with white-berried mistletoe, with an average of 2 mistletoe plants per infected tree; the largest number of plants per tree was 5. In the area of the Forest Administration Nova Gradiška 7.3 % of the examined narrow-leaved ash trees was infected with mistletoe, with an average of 4 mistletoe plants per tree; the largest number of mistletoe plants on one tree was 60.
Mistletoes are a constituent part of forest eco-systems and they do not represent a special threat to their hosts, if the infection intensity is not high. Although the percentage of infested trees varied in individual compartments, i.e. management units, the important fact was that the number of yellow mistletoe plants on infested sessile and pedunculate oak trees was not high (averaging 2 mistletoe plants per tree). The state of infection of the narrow-leaved ash was partly different in individual management units in the Forest Administration Nova Gradiška, where on the average a higher number of white-berried mistletoe plants on the infested trees was observed, and a relatively large number of plants on some trees
