Investigation of hosting status of barnyard grass [Echinochloa crus galli (L.)] and small flower umbrella sedge (Cyperus difformis L.) to rice white tip nematode (Aphelenchoides besseyi Christie, 1942) in rice growing areas of Turkey

摘要

 In this study, it has been investigated that barnyard grass [Echinocloa crus galli (L.) P. Beauv. Poaceae] and small flower umbrella sedge (Cyperus difformis L., Cyperaceae) which are major weeds in rice growing fields are the host plants for rice white tip nematode (Aphelenchoides besseyi) or not. For this purpose, barnyard grass and small flower umbrella sedge were collected in fields planted to Halilbey rice variety which is susceptible to white tip nematode and having 77% white tip symptoms on flag leaf at flowering and average 324 A.besseyi per panicle. In analysis against nematode, while no nematode was found in small flower umbrella sedge, average 30 A.besseyi/10 g seeds, 400 A.besseyi/plant with 15 tiller (flag leaf + panicle), 435 A.besseyi/plant with 6 tiller (flag leaf + panicle) were found in barnyard grass. These results are the first recorded research data in Turkey