Korean Journal of Applied Entomology 

About: Korean Journal of Applied Entomology is an academic journal published by Korean Society of Applied Entomology. The journal publishes majorly in the area(s): Population & Lepidoptera genitalia. It has an ISSN identifier of 1225-0171. Over the lifetime, 1327 publications have been published receiving 5174 citations.

Biological Characteristics of Lycorma delicatula and the Control Effects of Some Insecticides

Abstract: Biological Characteristics of Lycorma delicatula and insecticidal activity of some insecticides against nymphs of L. delicatula was investigated. Nymph of L. delicatula had 4 instars, and color of body was black. There were white spots on the body of 1st-3rd nymph. Upper body became red at 4th nymph. Adult forewings were brownish, and had black spots. Color of hind wing were red. The egg mass was covered with a yellowish brown secretion. The adult of L. delicatula emerged once a year. Among test insecticides, deltamethrin 1% EC and fenitrothion 50% EC showed very quick and strong insecticidal activity against the 2nd-3rd nymphs of L. delicatula. Imidacloprid 4% SL and clothianidin 8% SC showed 100% insecticidal activity at 24h after treatment. Thiacoprid 10% SC revealed the weakest insecticidal activity among the insecticides tested.

Feeding Behavior of Lycorma delicatula (Hemiptera: Fulgoridae) and Response on Feeding Stimulants of Some Plants

Abstract: Host preference was tested on the 7 species plants against ggot-mae-mi, Lycorma delicatula (Hemiptera: Fulgoridae) This insect highly preferred Ailanthus altissima and Vitis vinifera however, didn`t choose the other plants preferentially Both nymphs and adults lived longest in A altissima and V vinifera but lived in short and low ecdysis rate against other plants and 3 species fruits By analyzing the phloem-feeding behavior using EPG, L delicatula was showed the short time in non-probing phase and it also exhibit the longest feeding time in A altissima and V vinifera, but other plants did not feed the phloem at all In sugar contents analysis, A altissima existed high sucrose proportion and followed by fructose>glucose, V vinifera was analyzed by an order of glucose> fructose>maltose>sucrose>rhamnose, Malus pumila was as glucose> fructose, Pyrus calleryana was as glucose>unkown>fructose, Hibiscus syriacus was as sucrose>glucose Nymphs and adults of L delicatula lived longest in 5% sucrose solution, and next is in 5% fructose solution However, they lived short in other sugar solutions L delicatula nymph and adult according to the combination of sugar proportion found in original plants lived longer in sugar combination solution of A altissima and those of V vinifera was next Analyzed original sugar proportion from M pumila, P calleryana, H syriacus respectively, L delicatula lived short period comparing to the A altissima, V vinifera This result was judged that sugar contents affected on choosing the host plants

Monitoring of Acaricide Resistance in Field-Collected Populations of Tetranychus urticae (Acari: Tetranychidae) in Korea

Abstract: Eight field-collected populations of the two-spotted spider mites, Tetranychus urticae (Koch) from apple orchards of different geographical areas were tested for resistance to seven acaricides by leaf disk method in comparison with a susceptible strain. Marked regional variations of susceptibility were observed. Only low to moderate resistance to azocyclotin, fenpropathrin, propargite, and abamectin was obtained. However, high resistance to dicofol, fenpyroxymate, and pyridaen by eight field-collected populations was produced. Resistance to dicofol and fenpyroxymate was widespread. All of the strains tested were susceptible to one or more o the acaricides used. These results indicate that careful selection of the chemical used against any population of the two-spotted spider mite might result in satisfactory control.

Seasonal Occurrence, Soybean Damage and Control Efficacy of Bean Bug, Riptortus clavatus Thunberg (Hemiptera: Alydidae) at soybean Field in Honam Province

Abstract: This study was conducted to determine Seasonal Occurrence, soybean damage and control efficacy of bean bug, Riptortus clavatus Thunberg at soybean field in Honam province. Occurrence of R. clavatus varied at seeding times with annual difference. The peak occurrence of R. clavatus was appeared at late of August for late May seeding and middle of September for middle June seeding. There was difference in the peak occurrence of R. clavatus due to different growing stages affected by different weather conditions though soybean was seeded at same time. If the rate of soybean seed damage area by R. clavatus sucking increases, the germinating rate was greatly decreased. If the rate of soybean seed damage area is above 50 percent, in particular, the germinating rate was very low with 2 percent. Control efficacy against R. clavatus was the highest with at 3 times treatment of insecticide at (full pod stage) + (Beginning seed stage) + (full seed stage) of soybean growing stages in field.