• Proceedings of the Korean Society of Crop Science Conference
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• 1986.06a
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• pp.46-47
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• 1986

• Korean journal of applied entomology
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• v.14 no.2 s.23
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• pp.80-80
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• 1975

• Korean journal of applied entomology
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• v.31 no.1
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• pp.37-44
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• 1992

Morphometrics of the sensory appendages for host plant discrimination such as antenna, leg, rostrum of S. furcifera sampled from Korea, China, and Philippines were determined and compared. Computed discriminant scores of 89 characters produced scatter diagrams and group centroids revealing discrete segregations of the three populations.

• Korean journal of applied entomology
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• v.52 no.2
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• pp.133-140
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• 2013

The developmental times of the immature stages of Sogatella furcifera (Horvath) were investigated at ten constant temperatures (12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30, 32.5, $35{\pm}1^{\circ}C$), 20~30% RH, and a photoperiod of 14:10 (L:D) h. Eggs were successfully developed on each tested temperature regimes except $12.5^{\circ}C$ and its developmental time was longest at $15^{\circ}C$ (22.5 days) and shortest at $32.5^{\circ}C$ (5.5 days). Nymphs successfully developed to the adult stage from $15^{\circ}C$ to $32.5^{\circ}C$ temperature regimes. Developmental time was longest at $15^{\circ}C$ (51.9 days) and it was decreased with increasing temperature up to $32.5^{\circ}C$ (9.0 days). The relationships between developmental rate and temperature were fitted by a linear model and seven nonlinear models (Analytis, Briere 1, 2, Lactin 2, Logan 6, Performance and modified Sharpe & DeMichele). The lower threshold temperature of egg and total nymphal stage was $10.2^{\circ}C$ and $12.3^{\circ}C$ respectively. The thermal constant required to complete egg and nymphal stage were 122.0 and 156.3 DD, respectively. The Briere 1 model was best fitted ($r^2$= 0.88~0.99) for all developmental stages, among seven nonlinear models. The distribution of completion of each development stage was well described by three non-linear models (2-parameter, 3-parameter Weibull and Logistic) ($r^2$= 0.91~0.96) except second and fifth instar.

• Korean journal of applied entomology
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• v.12 no.4 s.17
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• pp.139-142
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• 1973

Experiment was conducted to study resistance of rice varieties and lines originated from Korea and IRRI-sources to the white-backed planthopper, Sogatella furcifera Horvath. The nature of varietal resistance to the insects was evaluated from the viewpoints of nymphal period and adult emergence. The varieties Colombia, Muthumanikam and Pankhari-203 were resistant, the varieties CO-22, Mudgo and Vellailangalayan moderately susceptible, the other varieties all susceptible. Nymphal period and rate of adult emergence were significantly different according to the degree of resistance of the rice varieties. Nymphal period was short (about 10 days) in the susceptible varieties and long (about 14-16 days) in the resistant varieties. The .ate of adult emergence was significantly lower in the resistant varieties than in the susceptible varieties. The lower rate of adult emergence in the resistant varieties may be due to the fact that the insects were suffered higher nymphal mortality in the resistant than in the susceptible varieties.

• Korean Journal of Organic Agriculture
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• v.26 no.3
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• pp.489-500
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• 2018

Rural Development Administration (RDA) is promoting the AFACI IPM (Asian Food & Agricultural Cooperation Initiative program). AFACI consist of 12 countries including Bangladesh, Cambodia, Thailand, Vietnam and so on. The main goal of the AFACI IPM project is 'Establishment of an international cooperative network for the best management of migratory rice planthoppers and setting data-base of pests occurrence information. As a result of the suvey, Planthoppers were increasing all the way from tillering stage to ripe stage and do not appear to be peak of one or two like korea case. In detail, 1,673 of BPH (Nilaparvata lugens) occurred in survey site of Svay Reang, Cambodia, followed by 1.237 at Dobila, Bangladesh. In the case of White backed planthopper (Sogatella furcifera), 1,163 of WBPH occurred in survey site of Dobila, Bangladesh and 849 WBPH were collected at Hamkuria, Bangladesh. It is expected to verify the occurrence and movement patterns of hoppers among member countries in the future.

• Korean journal of applied entomology
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• v.42 no.4
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• pp.361-365
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• 2003

Several species of planthoppers such as brown planthopper, N. lugens (Stal) (BPH), smaller brown planthopper, Laodelphax striatellus (Fall n) (SBPH), and white-backed planthopper, Sogatella furcifera (Horv th) (WBPH) are distributed in Korean rice paddies but not easy to discriminate them in situ. Accurate discrimination of them is an indispensable process in the forecasting for their outbreak and control. Especially, innovative discrimination method for BPH was required because BPH was one of the most important insect pest of rice. Nymphs and adults of BPHs, SBPHS, and WBPHS, thus, were examined their morphological characteristics in the paddies and laboratory. The nymphs of BPH had different characters from those of SBPH and WBPH. The nymphs of BPH had white fluorescent spot between bottom of compound eye and antenna, while there was no that spot the other two species. The white spot was the brightest at the nymphs just after hatching and getting weaker as the nymph developed. At last the white spot was totally disappeared at the adult stage. This white spot was innovative criterium to discriminate nymphs of BPH, SBPH, and WBPH in rice paddies.

• Korean journal of applied entomology
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• v.22 no.1 s.54
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• pp.41-44
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• 1983

In order to evaluate the technique of P-32 labelling method for screening lines of rice to whitebacked planthopper, the relationship between the amount of ingestion and feeding preference of insects were observed with the resistant and susceptible lines where characteristics were predetermined by comparing their feeding preference and antibiosis method. The feeding preference of the insects was significantly correlated with the amount of P-32 ingestion. It was more manifest in adults than nymphs of the whitebacked planthopper. The density of nymph and radioactivity of P-32 were high in the susceptible line. This suggested that deforming the ingestion amount of P-32 in the insects seemed to be useful technique for accurate screening. For this technique, the uniform labelling of P-32 on the rice seedings was prerequisite and the uniformity was increased by triming roots and leaves in the length and number.

• Korean journal of applied entomology
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• v.27 no.2
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• pp.81-86
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• 1988

Experiments were conducted to investigate the locational and ovipositional preferences of the single and mixed populations of the brown planthopper(BPH), Nilaparvata lugens (Stal), and the whitebacked planthopper(WBPH),Sogatella furcifera (Hovath), with the different popula-tion densities at seeding, max-tillering, booting and heading stages of rice variety seonam by대. The WBPH showed a locational preference for the upper portion while the BPH was observed to stay generally on the lower portion regardless of rice growth stages, population density-levels and the single or the mixed populations of two species. At seeding, max-tillerinf, boo-tring and heading stage, the preference for the lower portion of the rice plants was found to be slighty reduced with the lapse of time, respectively, from the single or the mixed popula-tions of both the species. Ovipositional lication of both the species was found not to be affected by the different population densities at rice growth stage. Although the BPH prefered a ovi-positional location for the lower portion at seeding, booting and heading stages, its preference-was somewhat reduced with the developmental stages of rice plants, whereas the WBPH showed a ovipositional preference for lower portion at seeding stages, but prefered the same tendency of ovipositional preference for the upper and the lower portion, The location and ovipositional preferences were likely to be affected by the competition between species with the mixed populations rather than single.

• Korean journal of applied entomology
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• v.57 no.4
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• pp.393-399
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• 2018

A loop-mediated isothermal amplification (LAMP) primer set (WBPH-65) was designed for the species-specific detection of white-backed planthopper (WBPH) Sogatella furcifera based on the full-length sequence of the internal transcribed spacer 2 (ITS2) (KC417469.1). The WBPH-65 primer set consists of six primers (total 165 bp), F3 (18 bp), B3 (18 bp), FIP (43 bp), BIP (40 bp), LF (21 bp), and LB (25 bp). After the LAMP reaction of three rice planthoppers, S. furcifera, Nilaparvata lugens, and Laodelphax striatellus, with the WBPH-65 primer set for 60 min at $65^{\circ}C$, the LAMP products were observed in the genomic DNA of S. furcifera only. According to the DNA amount of S. furcifera and incubation duration at $65^{\circ}C$, the difference of fluorescence relative to the negative control (0 ng) was clearly observed in a 40-min incubation with 10 and 100 ng or in case of 60-min incubation with 0.01, 0.1, 1, 10, and 100 ng. There was little difference in fluorescence between the negative control and all the other DNAs tested in 20- and 30-min incubations. On the other hand, the WBPH-65 primer set without LF and LB primers showed little amplification in the genomic DNAs of the three rice planthoppers, S. furcifera, N. lugens, and L. striatellus in a 60-min incubation. These results suggest that all six primers (F3, B3, FIP, BIP, LF, and BF) are necessary for the WBPH-65 primer set to detect S. furcifera within a 60-min incubation, and is able to discriminate S. furcifera from at least N. lugens and L. striatellus.