Gwan-Seok Lee

Prediction of overseas migration of the small brown planthopper, Laodelphax striatellus (Hemiptera: Delphacidae) in East Asia

A method has been developed for predicting the overseas migration of Laodelphax striatellus (Fallén) from eastern China to Japan and Korea. The method consists of two techniques: estimation of the emigration period in the source region and simulation of migration. The emigration period was estimated by calculating the effective accumulated temperature for the insect by use of real-time daily surface temperatures at the source. During the emigration period, migration simulations were performed twice a day, at every dusk and dawn. The prediction method was evaluated, by cross-validation using migrations in the 4 years from 2008 to 2011. The results showed that the emigration periods included the mass migrations, and that the method successfully predicted those migrations.

Analysis of the Occurrence of Rice stripe virus in Jeonnam Province

Occurrence of Rice stripe virus (RSV) was investigated in Jeonnam province from 2008 to 2011. Incidence of RSV was surveyed in paddy fields during growth stage. In western and southern coast parts of 5 districts, Jindo, Wando, Shinan, Haenam and Muan, rice was severely damaged by RSV from 2008 to 2009. But, RSV didn`t almost occur in 2010. Viruliferous ratio (VIR) of RSV from overwintered small brown plant hopper (SBPH, Laodelphax striatellus) showed 4.7%, 11.3%, 8.7%, and 2.8% from 2008 to 2011. It was highly recorded in Jindo, Wando, and Shinan of southwestern area. SBPH was collected by sucking machine at 1 with 3 replications per paddy field in March. The density of SBPH was high on March, but low on April in non-cultivated barley field from winter to spring. Farmer`s plowing this season assumed to be a cause of SBPH density decrease. The number of SBPH was 7.7, 5.4, and 4.0 per during three years, respectively.

Taxonomic Notes on the Korean Philostephanus Species (Heteroptera: Miridae: Mirinae)

A newly recorded species of Philostephanus Distant, 1909 from Korea, P. ulmi (Kerzhner, 1979), is reported with brief taxonomic notes on the Korean Philostephanus species. Morphological keys of the Korean Philostephanus species are provided with the photos of adults and female genitalia for each species.

Pattern of the Occurrence of Tomato spotted wilt virus in Jeonnam Province

Crop Protection Division, National Academy of Agricultural Science, Suwon 441-707, Korea(Received on October 9, 2013; Revised on November 4, 2013; Accepted on November 7, 2013)Tomato spotted wilt virus (TSWV) was occurred at 8 areas including Naju, Suncheon, Younggwang, Youngam,and Shinan in Jeonnam province and the crops of Younggwang were severely damaged by TSWV. The hotpepper (Capsicum annuum), bell pepper (Capsicum annuum va .r angulosum) and tomato (Solanumlycopersicon) in greenhouse and hot pepper in open field were infected by TSWV. Especially, hot pepper wasseverely damaged by TSWV infection. The survey data indicated that 1.1 −30% in the nursery field at Naju,Suncheon, and Jangheung were infected by TSWV. Plants were infected by TSWV from early June toAugust. However, TSWV-infected seedlings from nursery fields showed the disease symptoms from May aftertransplanting. In pepper greenhouses, Frankliniella occidentalis was more dominant insect vector thanFrankliniella intonsa. But in open field, the population of insect vector was opposed to greenhouse. Inaddition, the removal of weeds was able to delay the incidence of TSWV via side-window of greenhouse inWinter. Taken together, the control of weed and insect vector nearby side-window of greenhouse is importantto prevent TSWV infection of plants.Keywords : Frankliniella occidentalis, Hot pepper, Tomato spotted wilt virus

New record of Caliothrips tongi (Thysanoptera: Thripidae) in Korea

A panchaetothripine species Caliothrips tongi Mound et al., 2011 is recorded in Korea for the first time. The species was previously known only from the southern China. C. tongi were widely collected from several regions of Korea, causing severe damage to the leaves of Lactuca indica L. (Compositae).