The Korean Society of Pesticide Science

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The Korean Journal of Pesticide Science - Vol. 26 , No. 2

[ ORIGINAL ARTICLES ]
The Korean Journal of Pesticide Science - Vol. 26, No. 1, pp. 27-33
Abbreviation: Korean J. Pestic. Sci.
ISSN: 1226-6183 (Print) 2287-2051 (Online)
Print publication date 31 Mar 2022
Received 28 Jan 2022 Revised 14 Feb 2022 Accepted 04 Mar 2022
DOI: https://doi.org/10.7585/kjps.2022.26.1.27

Effects of Temperature and Overwintering on Insecticide Toxicity to Small Brown Planthopper
In-Hong Jeong* ; Sung-Wook Jeon ; Sang-Ku Lee1 ; Si Woo Lee2 ; Deok Ho Kwon2 ; Young Ho Koh3 ; Si Hyeock Lee4
Division of Crop Protection, National Institute of Agricultural Sciences, Wanju, Jeollabuk-do 55365, Republic of Korea
1Department of Herb Crop Resources, National Institute of Horticultural and Herbal Science, Eumseong, Gyeonggi-do 27709, Republic of Korea
2Department of Vegetable Crops, Korean National University of Agriculture and Fisheries, Jeonju, Jeollabuk-do 54874, Republic of Korea
3Ilsong Institute of Life Sciences, Hallym University, Anyang, Gyunggi-do 14068, Republic of Korea
4Department of Agricultural Biotechnology, Seoul National University, Seoul 08826, Republic of Korea

Correspondence to : *E-mail: ihjeong1@korea.kr

Funding Information ▼

Abstract

Temperature is one of the most important factors that affect insecticide toxicity and daily and seasonal fluctuation of insect occurrence in crop field. However, there is little information on the relationship between the temperature and insecticide toxicity of the small brown planthopper (SBPH). In this study, the influence of temperature on the toxicity of insecticide was examined. The toxicities of fipronil and three neonicotinoids, dinotefuran, imidacloprid, and thiamethoxam were found to be positive temperature coefficient and that of etofenprox was negative one. Carbamates (carbosulfan and fenobucarb) were showed no relations with temperature increase. As for the resistant SBPH strains, the toxicity ratio (RT) between 20 and 30oC of imidacloprid-resistant strain exhibited much higher (204.4 - fold) than that (1.0 - fold) of etofenprox-resistant one. The mean mortality of after-overwintering populations showed also significantly higher than that of before-overwintering populations. This study provides a clue to the effect of temperature rise on insecticide efficacy and gives the theoretical basis for the effective use of chemical insecticides and resistance management to control SBPH suffering the overwintering.


Keywords: Insecticide efficacy, Overwinter, Resistance, Small brown planthopper

Introduction

Temperature plays a crucial role in influencing the effectiveness of insecticides. It influences insect survival and population growth through alteration of fertility and fecundity rates, including survival and adult life-span (Dreyer and Baumagartners, 2000; Zhen et al., 2008). Relationships of temperature and toxicity within many species have been demonstrated in various studies (Give examples of publications by citing here). The continuous increase in temperature caused by climate change steadily influences the morphology, physiology and ecology of insect pests including insecticide resistance of indigenous insects by improving the adaptability of migratory insects to invade the once colder unfavorable regions. This has contributed to increased crop losses by insect pests in especially the temperate regions (Deutsch et al., 2018).

The Small brown planthopper (SBPH) Laodelphax striatellus Fallén (Hemiptera: Delphacidae) is one of the most serious pests in rice -fields in Asia. It destroys crops by sap-sucking behavior using its piercing-sucking mouthpart and also transmits various plant viruses, such as rice stripe virus (RSV), rice black-streaked dwarf virus (RBSDV), among others (Choi et al., 2018; Otuka, 2013). In Korea, SBPHs are divided into two groups; the overwintered indigenous SBPH populations, and migrated SBPH populations which migrate from China through seasonal winds from May to July (Hyun et al., 1977; Jeong et al., 2018).

The control of SBPH mostly rely on chemical insecticides including organophosphates, carbamates, pyrethroids, and neonicotinoids (Lee et al., 2005; Park et al., 2009). However, the insecticide resistance recorded in SBPH continues to reduce the reliability of many of the available insecticides due to negative changes in chemical toxicity. The change of toxicity due to temperature can be positive or negative, and depends on the differences in the mode of action, exposure routes of insecticide and target insects (Gordon, 2005). Pyrethroid and neonicotinoid insecticide classes have usually been reported to have negative and positive temperature coefficient, respectively in Nilaparvata lugens (Mao et al., 2019). In addition, some studies have reported that resistant strains show poor winter survival, maladaptive behavior and reduced reproductive fitness (Foster et al., 2000). They differ from the susceptible strains in some biological advantages such as high adaptation ability to insecticide and survival in insecticide exposure, and finally replace the susceptible strains. It is therefore important to critically consider the effects of temperature on insecticide efficacy as a way of ensuring efficiency in the use of insecticides and subsequent reduction of the foreseeable impacts of insect resistance. However, the effects of temperature on insecticidal toxicity to SBPH has not been intensively studied.

Therefore, in this study, the effect of temperature on the effectiveness of commercial insecticides was assessed after exposing SBPHs to different temperatures, and the change of insecticide toxicity to local SBPH populations after overwintering was also checked. From these results, some important suggestions can be proposed for the future insect control methods and insecticide study.


Materials and Methods
Insecticides and susceptible SBPH strain

Six insecticides (carbosulfan, 20% SC; fenobucarb, 50% EC; etofenprox, 20% EC; dinotefuran, 10% WP; imidacloprid, 10% WP; thiamethoxam, 10% WG) registered for SBPH control in Korea were purchased commercially, and fipronil (5% EC) was experimentally provided by Sungbo Chemical Co. Ltd (Korea) instead of the registered 0.5% FG formulation (Table 1). The susceptible SBPH (Sus-SBPH) strain maintained without exposure to any insecticide for ten years in an insectarium (Division of Crop protection, National Institute of Agricultural Sciences) in acryl cage (30 × 22 × 30 cm3) by serving seedlings of Chucheong rice variety conditioned at 25 ± 2oC, 50-60% relative humidity, and a 16:8 (L:D) photoperiod was used (Jeong et al., 2017). Egg-laid rice seedling were divided in five groups and hatched in different temperature condition (15, 20, 25, 30 and 35oC). The 3rd nymphs were introduced into bioassay.

Table 1. 
Insecticides and its recommended concentration
Chemical group (IRAC classification) Insecticide Active ingredient (%) & formulation a) Recommended
concentration (ppm)
Carbamates (1A) Carbosulfan 20% SC 200
Fenobucarb 50% EC 500
Phenylpyrazoles (2B) Fipronil 5% EC 50
Pyrethroids (3A) Etofenprox 20% EC 100
Neonicotinoids (4A) Dinotefuran 10% WP 100
Imidacloprid 10% WP 20
Thiamethoxam 10% WG 10
a) SC, suspension concentrate; EC, emulsifiable concentrate; WP, wettable powder; WG, water dispersible granule.

Median lethal concentration in different temperatures

Bioassay was conducted by rice-seedling dipping (Jeong et al., 2017). Rice (Chucheong) was seeded on the seedling pot, and young seedling stem was used for assay after 3-4 weeks. The seedlings were picked up from the pot, washed, and the seedling stems (7 cm long) were cut without damaging the whole root after being dried in the shade. Five stems were packed to one batch and soaked in designated concentration of insecticides for 30 seconds and dried in the shade. The roots were then rolled with sanitary cotton and put into the glass test tube (φ27 × h200 mm2) and 15 nymphs of 3 days old were introduced into the glass tube and dead insects were counted at 72 h after treatment. Every treatment was performed in triplicate. For calculating median lethal concentration (LC50), statistical program of SPSS 13.0 (IBM Analytics, Armonk, NY) was used.

Resistant SBPH strains and their resistance ratio with temperature

Two insecticide-resistant SBPH strains were previously established in our published paper (Jeong et al., 2021). Briefly, SBPHs collected from the rice paddies in 2018 were divided into two groups and then treated with either imidacloprid (10% WP) or etofenprox (20% EC) with LC30 concentrations (5 ppm and 25 ppm, respectively) and total 7-9 selections were conducted. The resistance ratio (RR) of the imidacloprid-resistant SBPH strain (ImR-SBPH) and the etofenprox-resistant SBPH one (EtR-SBPH) was 88.9 and 48.1, respectively (Table 2).

Table 2. 
Resistance ratio of resistant SBPH strains
Pesticide Strain LC50 (ppm) Slope ± SE df χ2 p R/Ra)
Imidacloprid Sus-SBPH 2.03 1.19 ± 0.12 19 15.148 0.71 1
ImR-SBPH 180.48 1.21 ± 0.10 21 15.157 0.82 88.9
Etofenprox Sus-SBPH 1.98 1.60 ± 0.16 16 17.452 0.36 1
EtR-SBPH 95.14 1.29 ± 0.13 19 4.176 1.0 48.1
a) Resistance ratio calculated by dividing by LC50 of susceptible strain (Sus-SBPH).

The 3rd instar nymphs of one susceptible (Sus-SBPH) and two resistance strains (ImR-SBPH and EtR-SBPH) were introduced to bioassay with rice-stem dipping method previously described. The exposure temperature was only different with 20 and 30oC after 72 h insecticide treatment. These two temperatures were selected in consideration of the range (18-32oC) of average monthly temperature from April to September. Two insecticides, imidacloprid WP and etofenprox EC were treated to the imidacloprid strains and etofenprox strains, respectively. For calculating median lethal concentration (LC50), statistical probit analysis of SPSS 13.0 (IBM Analytics, Armonk, NY) was used and the resistance ratios of the populations were compared.

Single concentration diagnosis and overwintering effect

The 14 populations of SBPH were collected in the early winter of 2018 (before-overwintering population) and the spring of 2019 (after-overwintering population) at seven local areas, Chungju (CB_CJ), Sangju (GB_SJ), Yeongcheon (GB_YC), Taean (CN_TA), Buan (GB_BA), Shinan (JN_SA) and Jindo (JN_JD). The 3rd nymphs of populations collected were reared two generations in laboratory.

Five insecticides (carbosulfan, 20% SC; etofenprox, 20% EC; dinotefuran, 10% WP; imidacloprid, 10% WP; fipronil, 5% EC) were used to study insecticide responses (Table 1) and each diagnostic concentration (DC) (40 ppm, 10 ppm, 50 ppm, 300 ppm and 3 ppm, respectively) was deduced from the two times concentration of LC90 value to susceptible SBPH. Bioassay was conducted by the rice-seedling dipping method (Jeong et al., 2017) with the same materials and procedures. After 72 h of insecticide treatment, dead insects were counted for the calculation of mortality based on Abbott’s formula (Abbott, 1925). The differences between mortality of the before- and after-overwintering populations in each area were compared and analyzed by statistical t-test using SPSS 13.0 (IBM Analytics, Armonk, NY).


Results and Discussion
Temperature related insecticide responses

To explore the influence of temperature on the toxicity of insecticide, the toxicities of five insecticides to SBPH under different temperature conditions were determined (Table 3). Phenylpyrazole and neonicotinoids demonstrated positive temperature coefficients. Based on LC50 values, the toxicity of fipronil increased 3.7, 12.5, 40.5 and 345.2 folds at each sequential temperature (20, 25, 30 and 35oC) when compared with the toxicity at 15oC. Similarly, the toxicities of three neonicotinoids showed a significant increase (1.1, 5.9, 24.8 and 494.3 folds for dinotefuran, 1.6, 6.1, 44.8 and 446.6 folds for imidacloprid, 2.2, 4.9, 10.2 and 41.3 folds for thiamethoxam) when compared with their toxicity at 15oC. These results were similar to the results shown in other studies involving other pest insects (Boina et al., 2009; Mao et al., 2019). Therefore, the higher the temperature, the better the control efficiency. In contrast, the toxicity of pyrethroid, etofenprox showed negative temperature coefficient and its toxicity of decreased by 2.2, 6.5, 8.9 and 3.8 folds at each sequential temperature when compared with the toxicity at 15oC. This is in agreement with published findings from studies involving other pyrethroid insecticides (Mao et al., 2019) and pyrethroid insecticides will perform better efficacy at low temperatures in the field. Carbamates (carbosulfan and fenobucarb) showed no relations with temperature increase.

Table 3. 
Effect of temperature on insecticide toxicity to the susceptible SBPH strain
Pesticide LC50 (ppm) (Temperature coefficient a))
15oC 20oC 25oC 30oC 35oC
Cabosulfan SC 2.23 (1.0) 3.30 (- 1.5) 2.92 (- 1.3) 1.86 (1.2) 0.89 (2.5)
Fenobucarb EC 3.08 (1.0) 4.92 (- 1.6) 6.27 (- 2.0) 5.98 (- 1.2) 3.24 (- 1.1)
Fipronil EC 6.79 (1.0) 1.85 (3.7) 0.55 (12.5) 0.17 (40.5) 0.02 (345.2)
Etofenprox EC 0.93 (1.0) 2.01 (- 2.2) 6.03 (- 6.5) 8.24 (- 8.9) 3.49 (- 3.8)
Dinotefuran WP 13.64 (1.0) 11.99 (1.1) 2.30 (5.69) 0.55 (24.8) 0.03 (494.3)
Imidacloprid WP 49.72 (1.0) 31.44 (1.6) 8.15 (6.1) 1.11 (44.8) 0.11 (446.8)
Thiamethoxam WG 5.13 (1.0) 2.34 (2.2) 1.05 (4.9) 0.50 (10.2) 0.12 (41.3)
a) Ratio of higher to lower LC50 value between each temperature and 15oC. A negative coefficient indicates a higher LC50 at the higher temperature.

When compared with the toxicity at the temperature of 20oC (about average temperature ranged from 16 to 26oC in May to June in Korea), fipronil and neonicotinoid insecticides would be more recommended for SBPH management than pyrethroid insecticides (Fig. 1). Many researchers have suggested that the toxicity change of insecticides on the different temperature is related with the penetration and biotransformation of insecticides (Harwood et al., 2009), nerve impulse movement (Song and Narahasi, 1996), feeding consumption rate (Mao et al., 2019), detoxification and metabolic mechanism of insects (Cui et al., 2012; Shao et al., 2013). However, information on the toxicity dynamics of insecticides with temperature change is scarce. The assessment of temperature effects on the toxicity of different insecticides against a target insect is important to establish the chemical control strategies in given environmental conditions.


Fig. 1. 
Comparison of insecticide toxicities on different temperature. a) RL is the ratio of LC50 value at each temperature compared by 20oC.

Effect of temperature on insecticide toxicity to the resistant SBPH strains

To determine the influence of temperature on the toxicity of insecticide to the resistance SBPH strains, the toxicities of two strains, imidacloprid-resistant and etofenprox-resistant SBPH were assessed under different temperatures of 20 and 30oC (Table 4). The toxicity ratio (TR) between the two temperatures of imidacloprid-resistant strain was higher (204.4) than that (1.0) of etofenprox-resistant strains. The resistance ratio (RR) of two strains decreased from 94.4 to 5.3 times in imidacloprid-resistant strain and from 38.3 to 16.9 times in etofenprox-resistant strain as temperature rises, respectively. The toxicity of the imidacloprid-resistant strain increased highly with temperature rise, which is similar to that of the susceptible strain, but the etofenprox-resistant strain showed no change in toxicity with temperature increase. The resistance ratio (RR) of the two resistant strains decreased with temperature increase, which indicates the toxic activity of the resistant strain is more sensitive to temperature change than that of the susceptible strain. Previously we reported that there was no strong correlation between the activities of the detoxifying enzymes (total esterase, acetylcholinesterase and glutathione S-transferase) and temperature changes in the various SBPHs. In contrast, the amounts of ROS, which were more abundant in the two resistant SBPH strains than in the Sus-SBPH strain, showed a strong correlation with temperature changes in all the strains, suggesting that ROS can play an important role in the temperature-related resistance change of SBPH (Jeong et al., 2021). This finding that resistance intensity can change with temperature has implications for the dynamics of resistance management. More researches on the biochemical, physiological, and genetic changes in a wide range of insects are needed to understand the insecticide resistance associated with temperature.

Table 4. 
Effect of temperature on insecticide toxicity to the resistant SBPH strains
Insecticide Straina) Temp. LC50 (ppm) Slope ± SE N df χ2 p TRb) RRc)
Imidacloprid ImR-SBPH 20oC
30oC
4410.8
21.6
1.26 ± 0.15
1.75 ± 0.19
287
244
12
13
26.21
27.10
0.01
0.01
204.4 94.4
5.3
Sus-SBPH 20oC
30oC
46.7
4.07
1.84 ± 0.24
1.03 ± 0.11
230
314
13
16
5.99
25.24
0.74
0.66
11.5 -
Etofenprox EtR-SBPH 20oC
30oC
109.9
109.5
1.59 ± 0.24
1.47 ± 0.22
330
342
19
19
19.68
21.06
0.41
0.33
1.0 38.3
16.9
Sus-SBPH 20oC
30oC
2.9
6.5
1.18 ± 0.14
1.6 ± 0.17
310
331
19
18
15.34
26.84
0.70
0.08
- 2.3 -
a) ImR-SBPH, imidacloprid resistant; EtR-SBPH, etofenprox-resistant; Sus-SBPH, susceptible.
b) Ratio of higher to lower value for 20 and 30oC differences. A negative value indicates a higher LC50 at the higher temperature.
c) Resistance ratio obtained by dividing LC50 of resistant strain by LC50 of Sus-SBPH at given temperature.

Effect of overwintering on insecticide toxicity to the local SBPH populations

To compare the changes of insecticide toxicity with overwintering, the mortality effects of five insecticides on 14 populations in seven location collected before and after overwintering seasons were evaluated (Table 5). The etofenprox showed the highest mortality in Taean population (89.8 %) and low in other populations (29.6 - 60.5%) in the before-overwintering season. After overwintering, its mortality increased in Chungju, Sangju, Yeongcheon; maintained in Buan, and decreased in Taean, Shinan and Jindo. The mortality rate of carbosulfan showed a more increasing change in all location from a range of 10.0 - 67.9 % to 50.0 -79.2%. The mortality rates of dinotefuran and imidacloprid have large increased in all locations after overwintering. Dinotefuran and imidacloprid showed low mortality range of 25.6 - 66.7% and 3.5 - 60.5% in the before-overwintering season and high mortality range of 61.2 - 95.9 % and 60.4 - 94.9 % in the after-overwintering season, respectively. The mortality of fipronil increased in Chungju, Sangju, Yeongcheon, maintained in Taean, and decreased in Buan, Shinan and Jindo. Although the efficacy of five pesticides has not increased on all the local populations, the mean mortality (66.3%) of after-overwintering populations were significantly higher than that (35.1%) of the before ones (Fig. 2).

Table 5. 
Mortality (%) of SBPH populations collected in different time
Pesticides Locations Mortality (% ± SE)
Beforea) Afterb)
Etofenprox EC (20%) CB_CJ
GB_SJ
46.9 ± 8.54
38.3 ± 18.26
51.0 ± 18.25
66.7 ± 8.47
GB_YC 29.6 ± 13.24 40.0 ± 16.30
CN_TA 89.8 ± 7.22 44.9 ± 13.69
JB_BA 54.0 ± 20.49 54.2 ± 9.32
JN_SA 60.5 ± 20.00 5.0 ± 2.80
JN_JD 37.6 ± 22.07 31.3 ± 23.98
Carbosulfan FL (20%) CB_CJ
GB_SJ
18.8 ± 6.76
29.8 ± 9.42
67.3 ± 13.30
54.2 ± 16.05
GB_YC 10.0 ± 11.23 65.0 ± 10.46
CN_TA 67.9 ± 11.38 72.3 ± 11.38
JB_BA 30.6 ± 24.35 79.2 ± 17.81
JN_SA 31.4 ± 20.27 58.3 ± 19.49
JN_JD 26.9 ± 17.80 50.0 ± 17.12
Dinotefuran WP (10%) CB_CJ
GB_SJ
35.5 ± 23.08
28.4 ± 22.82
61.2 ± 18.25
71.5 ± 16.71
GB_YC 25.6 ± 18.60 80.0 ± 18.60
CN_TA 50.3 ± 24.86 95.9 ± 16.77
JB_BA 42.9 ± 11.63 61.5 ± 6.88
JN_SA 53.5 ± 21.04 64.7 ± 11.11
JN_JD 54.0 ± 15.17 77.1 ± 23.75
Imidacloprid WP (10%) CB_CJ
GB_SJ
8.7 ± 7.88
14.0 ± 16.75
91.8 ± 4.56
94.9 ± 13.30
GB_YC 3.5 ± 4.74 77.5 ± 11.37
CN_TA 34.7 ± 26.61 83.7 ± 20.54
JB_BA 8.7 ± 5.97 60.4 ± 13.69
JN_SA 60.5 ± 15.42 75.1 ± 8.72
JN_JD 18.0 ± 8.37 81.0 ± 5.24
Fipronil EC (5%) CB_CJ 39.9 ± 13.87 79.6 ± 14.43
GB_SJ 35.3 ± 17.13 80.0 ± 12.39
GB_YC 62.1 ± 18.72 80.0 ± 18.72
CN_TA 61.2 ± 8.54 63.8 ± 14.25
JB_BA 41.6 ± 22.06 22.9 ± 15.80
JN_SA 85.4 ± 11.86 60.3 ± 18.58
JN_JD 33.6 ± 18.53 64.6 ± 18.92
a) test of the befere-overwintering population
b) test of the after-overwintering population.


Fig. 2. 
Mean mortality of seven local SBPH populations against five insecticides before- and after-overwintering.

Overwintering is the crucial factor for the survival of insect in the subtropical and temperate climate zones with stressful environmental condition, e.g., unavailable food resources, low temperatures or water deficits (Williams et al., 2015). The low temperature during winter can affect the mortality of insects due to severe tissue damages or accumulated chill injuries (Turnock and Fields, 2005). The overwintering mortality rates are influenced by many factors besides the low winter temperature.

Fitness costs associated with insecticide resistance are accompanied by high energetic cost or significant disadvantage that diminishes the insect’s fitness compared with its susceptible counterparts in the population. This fitness costs are known to affect differences with resistant and susceptible strains in some properties, such as developmental time, fecundity and fertility, sensitivity to alarm pheromone, and overwintering success (Talebi et al., 2015). In this study, the efficacy of five insecticides on SBPH showed the tendency to rise after overwintering, which suggested that the resistant SBPH would be more susceptible to overwintering (Fig. 2). Apparently, when fitness costs are high at low temperatures, relaxation of selection pressure is likely to favor a population’s reversion to susceptibility in regions of a relatively cold winter. Understanding the relationship of fitness cost and insecticidal resistance could be useful to design effective insecticide resistance management strategies. Overwintering would be helpful to lower the severity of resistance problem in domestic population, most of all, monitoring the migratory SBPH populations which move from China to Korea and mix with domestic populations every year would be especially emphasized.


Conclusion

Temperature changes due to the global warming can affect the population growth, overwintering, migration pattern and insecticide resistance accumulation of pests. It can influence the insecticide efficacy to field pest populations and lead to fail in controlling on time. Therefore, it is important to adjust the insect management strategies to the changes of annual occurrence, winter survival, migration and distribution of SBPH. The evaluation of resistance status and selection of effective insecticides with temperature rise are also inevitable in insect pest management.


Acknowledgments

This study was carried out with the support of “Research Program for Agricultural Science & Technology Development (Project No. PJ0108212019)”, National Institute of Agricultural Science, Rural Development Administration, Republic of Korea.

Disclosure of potential conflicts of interest

The authors declare that they have no conflict of interest.


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Author Information and Contributions

In-hong Jeong, Division of Crop Protection, National Institute of Agricultural Sciences, Senior researcher, https://orcid.org/0000-0002-4625-2268

Sung-Wook Jeon, Division of Crop Protection, National Institute of Agricultural Sciences, Postdoctoral researcher, https://orcid.org/0000-0002-5707-4532

Sang-Ku Lee, Division of Crop Protection, National Institute of Agricultural Sciences, Postdoctoral researcher

Si Woo Lee, Department of Vegetable Crops, Korean National University of Agriculture and Fisheries, Senior researcher

Deok Ho Kwon, Department of Vegetable Crops, Korean National University of Agriculture and Fisheries, Professor

Young Ho Koh, Ilsong Institute of Life Sciences, Hallym University, Anyang, Professor, https://orcid.org/0000-0003-3608-4376

Si Hyeock Lee, Department of Agricultural Biotechnology, Seoul National University, Professor

Methodology &Writing-Original Draft Preparation; In-Hong Jeong; Investigation, Sung-Wook Jeon and Sang-Ku Lee; Data Analysis, Young Ho Koh; Writing- Review & Editing, Deok Ho Kwon and Si Woo Lee; Conceptualization & Supervising, Si Hyeock Lee