This study was conducted to investigate the seasonal occurrence of Phyllocnistis citrella Stainton (Citrus leafminer; CLM) and parasitoids in Jeju region, where the damage of CLM to the citrus farm has been recently increased. For this study, annual CLM mornitoring using sex pheromone traps were conducted in the citrus farm of Jeju from 2011 to 2015. The mean annual occurrence of CLS was 477,389 and appeared to increase along the temperature.

The genus Phyllocnistis belongs to the family Gracillariidae including 85 described species in the world (De Prins and De Prins 2005). The genus has been placed under the family Phyllocnistidae, which is now the subfamily of the family Gracillariidae. In Korea, only one species of the family, Phyllocnistis citrella Stainton has been listed for the first time by Ko (1969) without the taxonomic information. It was first reported by Heppner (1993) from North America, and it has become to the major pest of Rutaceae, especially damaging on the genus Citrus spp. It has been called as CLM (citrus leafminer) in the world. This study was carried out to identify and monitor CLM easily and correctly with providing the genitalic structures and DNA barcode which is now one of the major insect pest on citrus farm.

The objective of this study was comparison of seed yields according to different seeding rates, seeding time and application of chemical fertilizations in Yanji region of China. The experiment was conducted on commercial farmland at Yanji region in 2013. All the experimental fields were designed following randomized block design with 3 replicates. The plant spacing was applied as 65×1 cm distance. To check the effect of seeding rate, two different seeding rate, 0.2 kg/0.1ha and 0.5 kg/0.1ha were applied. The higher seed yield was observed in low seeding rate (0.2 kg/0.1ha). The application of fertilizer (mixture of N and P) showed different results following different experimental fields. However, there were little positive effects following fertilizer application into commercial farmland. When we compare seed yields between two different seeding dates, 4th May and 29th May, the earlier seeding date (4th May) showed higher seed yields. In considering these results, low seeding rate and early seeding time is important for getting high camelina seed yields.