• Korean journal of applied entomology
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• v.43 no.3 s.136
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• pp.241-247
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• 2004

Susceptibility of Blattella germanica male adults to 61 commercial insecticides was evaluated by diet dipping method. Among them three insecticides of dichlorvos, fenitrothion, and fipronil showed over $90\%$ mortality. The insect was more susceptible to dichlorvos and fenitrothion in filter paper contact method than in diet dipping one, but fipronil was vice versa. Toxicities of the three chemicals were evaluated by application parts of the such as head, thorax, abdomen, and legs. Dichlorvos and fenitrothion were more toxic when applied to head, and flpronil was thorax. $LT_{50}$ values by diet dipping method showed that fenitrothion and fipronil acted more rapidly than boric acid and hydramethylnon. The values of the former two were 1.05 and 0.98 days, and those of the latter two were 3.92 and 2.26 days, respectively.

• The Korean Journal of Pesticide Science
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• v.8 no.3
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• pp.210-219
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• 2004

Susceptibility of Periplaneta americana male adults to 61 commercial insecticides was evaluated by diet dipping method. Among them eight insecticides of dichlorvos, benfuracarb, cypermethrin, deltamethrin, fenpropathrin, $\zeta$-cypermethrin, $\lambda$-cyhalothrin and fipronil showed 100% mortality. The insect was more susceptible to dichlorvos and fenpropathrin in filter paper contact method than in diet dipping one, but benfuracarb was vice versa. Toxicities of the seven chemicals were evaluated by application parts of the such as head, thorax, abdomen, and legs. Dichlorvos, benfuracarb and $\lambda$-cyhalothrin were more toxic when applied to head, and deltamethrin, fenpropathrin and cypermethrin were abdomen. $LT_{50}$ values by diet dipping method showed that dichlorvos, benfuracarb and $\lambda$-cyhalothrin acted more rapidly than boric acid and hydramethylnon. The values of the former three were 0.10, 0.29 and 0.12 days, and those of the latter two were 6.2 and 4.8 days, respectively.

• The Korean Journal of Pesticide Science
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• v.12 no.2
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• pp.177-183
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• 2008

For the development of integrated pest management system by harmonizing biological and chemical control, some experiments were carried out to select low toxic pesticides against natural enemies. Leaf dipping method, body dipping method, and diet treatment method were used for the toxicity evaluation against Microplites mediator adults. We tested 49 different pesticides (34 insecticides, 11 fungicides, 4 herbicides) at recommending concentration commonly used to control insect pests, disease and up-land weeds in chinese cabbage field. 16 insecticides, 11 fungicides, and 4 herbicides were shown to be low toxic to Microplites mediator adults in the treatment of body dipping.

• Korean journal of applied entomology
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• v.46 no.2
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• pp.251-259
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• 2007

For the development of integrated pest management system by harmonizing biological and chemical control, some experiments wee carried out to select low toxic pesticides against natural enemies. and their residual toxicity were evaluated. Leaf dipping method, body dipping method, and diet treatment method were set up for the toxicity evaluation against Cotesia glomerata adults. We had tested 46 different pesticides (31 insecticides, 11 fungicides, 4 herbicides) at recommending concentration commonly used to control diamond back moth, disease and up-land weeds in chinese cabbage field. Twenty three insecticides, eleven fungicides, and four herbicides were shown to be low toxic to C. glomerata adults in the treatment of body dipping. After insecticide spraying at recommending dose on the chinese cabbage, we examined residual effect of insecticides by introducing natural enemies on different days. Safety interval for the introduction of C. glomerata adults was established according to the residual toxicity of pesticides. Safe insecticides for the introduction of C. glomerata adults at one day after treatment (DAT) were thiacloprid, acephate, chlorfenapyr, clothianidin and at 3 DAT were imidacloprid, deltamethrin, thiamethoxam, dimethylvinphos, emamectin benzoate.

• The Korean Journal of Pesticide Science
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• v.10 no.3
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• pp.218-224
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• 2006

Toxicities of 34 agricultural insecticides was tested against Monomorium pharaonis workers by diet dipping method. Ten insecticides among them, bifenthrin, chlorpyrifos, chlorpyrifos-methyl, cypermethrin, dichlorvos, fenthion, fenitrothion, methidathion, pirimifos-methyl, and phenthoate showed 100% rapid mortality. $LC_{50}$ (ppm) values of selected insecticides were appeared on the order of pirimifos-methyl (0.33), chlorpyrifos-methyl (0.76), phenthoate (1.70), bifenthrin (1.78), dichlorvos (2.50), cypermethrin (9.92), chlorpyrifos (22.21), fenitrothion (36.58), fenthion (40.96), and methidathion (64.34). $LT_{50}$ (day) values by diet dipping method showed that dichlorvos, benfuracarb and cypermethrin acted more rapid than boric acid and hydramethylnon. The values of the former three were 0.25, 0.38 and 0.27 days, and those of the latter two were 3.4 and 2.6 days, respectively. In persistance effect tests, chlorpyrifos-methyl, fenthion and methidathion showed over 90% insecticidal activity for 13 days.

• Korean journal of applied entomology
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• v.17 no.3 s.36
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• pp.155-160
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• 1978

This experiment was carried out to develope a technique for labelling pine gall midge with ·radioactive phosphorus and calcium. This technique evolved would help to obtain basic information on the appropriate concentration of $^{32}P\; and\; ^{45}Ca$ in tagging and determination of adult flight ranges which considered as one of the factors in dissemination. 1. Labelling at the larval stage of pine gall midge by injection of $^{45}Ca$ into pine tree trunk appeared not to be effective for tagging the adults because radioactivity was gradually decreased to background by emergence. 2. The radioactivities of larvae in the galls gradually increased in September but from October 1 the activity was gradually decreased for 10 days then equilibrium was maintained thereafter. The results seem to indicate that larval diet termination occured early October. 3. A maximum level of radiation was detected at 3 weeks after $^{32}P$ injection and thereafter it was gradually reduced. This result implies that $^{32}P$ is not appropriate radioisotope in labelling pine gall midge through trunk injection method. 4. After washing in running water for 10 minutes, the optimum$^{32}P$ concentration for treated overwintered larvae and pupae was found to be 0.5 micro curie per ml. for 30 minutes dipping.