Investigations on repellent and insecticidal effects of Xanthium strumarium L. on Colorado potato beetle leptinotrasa decemlineata say (Col: Chrysomelidae)

The repellent effects of the extracts of Xanthium strumarium fruits and leaves dilueted with 1/6, 1/8, 1/10 water (w/v) for fruits and 1/6, 1/8 (w/v) for leaves were investigated with randomised plot design and 25 replicates under laboratory conditions. | Tr. J. of Agriculture and Forestry 22 (1998) 543-552 © TÜBİTAK Investigations on Repellent and Insecticidal Effects of Xanthium strumarium L. on Colorado Potato Beetle Leptinotrasa decemlineata Say (Col: Chrysomelidae) Suzan ÇETİNSOY, Ali TAMER Plant Protection Research Institute, 06172-Ankara-TURKEY Mete AYDEMİR General Directorate of Agricultural Researches, Ankara-TURKEY Received: Abstract: The repellent effects of the extracts of Xanthium strumarium fruits and leaves dilueted with 1/6, 1/8, 1/10 water (w/v) for fruits and 1/6, 1/8 (w/v) for leaves were investigated with randomised plot design and 25 replicates under laboratory conditions. Insecticidal effect was also studied in laboratory. It was found that insecticidal effect was low, where as repellent effect was quite high. On the other hand, the effect of 1/6 concentration of fruit extract against adult and larvae of Colorado Potato Beetle was investigated under field conditions and the repellent effect was confirmed. Domuz Pıtrağı (Xanthium strumarium L.)’nın Patates Böceği ((Leptinotarsa decemlineata Say (Col.: Chrysomelidae))’ne Repellent ve İnsektisid Etkileri Üzerinde Araştırmalar Özet: Domuz pıtrağı meyvesinin 1/6, 1/8, 1/10, (ağırlık/hacim), yapraklarının ise 1/6, 1/8 (ağırlık/hacim) oranındaki su ekstraktlarının laboratuvarda repellent etkileri tesadüf parselleri deneme desesine göre 25 tekerrürlü olarak araştırılmıştır. Ayrı bir deneme ile de insektisit etkili olup olmadığı saptanmaya çalışılmıştır. İnsektisit etki düşük, repellent etki yüksek bulunmuştur. Domuz pıtrağı meyvesinin 1/6 oranında hazırlanmış su ekstraktının patates böceğinin ergin ve larvalarına tarla koşullarındaki etkileri araştırılmıştır. Deneme eş yapma deneme desesine göre 6 tekerrürlü olarak kurulmuş ve ekstraktın patates böceğinin ergin ve larvalarının beslenmesini engelleyip kaçırdığı tespit edilmiştir. Introduction Potato is an important crop with 4300000 tons production and 192000 hectars growing area in .