Epicuticular wax content in the leaves of cabbage (Brassica oleracea L. var. capitata) as a mechanical barrier against three insect pests | Vsebnost epikutikularnih voskov na listih zelja (Brassica oleracea L. var. capitata) kot mehanska ovira pred napadom treh škodljivih žuželk

English. Flea beetles (Phyllotreta spp.), cabbage stink bugs (Eurydema ventrale) and onion thrips (Thrips tabaci) cause significant economic problems to cabbage growers in Slovenia. The aim of our study was to assess the potential effect of the epicuticular wax on leaves as defence mechanism against these three cabbage pests. The impact of epicuticular wax content in relation to damage levels of cabbage pests was studied under field conditions at the Experimental Field of the Biotechnical Faculty in Ljubljana on 12 cabbage cultivars (Brassica oleracea L. var. capitata). These insect pests showed weak preference on cabbage heads with high epicuticular wax. There was a strong negative relationship between epicuticular wax content and the level of plants infested (r2 = -0.8399 for flea beetles, r2 = -0.7413 for cabbage stink bugs and r2 = -0.7042 for onion thrips). The cv.'Holandsko pozno rdeče', showed itself to be the most resistant to the cabbage stink bugs and onion thrips, while cv. 'Red Dinasty' was the most resistant against flea beetles.

Slovenian. Kapusov bolhač (Phyllotreta spp.), pisana stenica (Eurydema ventrale) in tobakov resar (Thrips tabaci), povzročajo gospodarsko pomembne težave pridelovalcem zelja v Sloveniji. Cilj naše raziskave je bil oceniti potencialni učinek epikutikularnega voska na listih kot obrambnega mehanizma proti naštetim škodljivcem. Vpliv količine epikutikularnega voska na poškodbe, ki jih povzročajo škodljivci, smo proučevali na 12 kultivarjih zelja (Brassica oleracea L. var. capitata), vzgojenih na Laboratorijskem polju Biotehniške fakultete v Ljubljani. Škodljivci so pokazal majhno preferenco do zeljnih glav, ki imajo visoko vsebnost epikutikularnega voska. Med koncentracijo epikutikularnega voska in poškodovanimi listi je bila namreč ugotovljena močno značilna negativna povezava (r2 = -0.8399 za kapusovega bolhača, r2 = -0.7413 za pisano stenico in r2 = -0.7042 za tobakovega resarja). Cv.'Holandsko pozno rdeče', se je pokazal kot najbolj odporen kultivar ob napadu tobakovega resarja in pisane stenice, medtem, ko je bil cv. 'Red Dinasty' najmanj odporen proti napadu kapusovega bolhača.