Objective To assess the killing efficacy of three photosensitizers such as rose bengal(RB),erythrosin B andα-terthiophe to the fourth-instar larvae of Aedes albopictus in the laboratory and the field.Methods The number of dead larvae was recorded after application of RB,erythrosin B andα-terthiophen at different illumination conditions,and experimental parameters affecting photoinsecticidal was analyzed.The toxicity mechanism of RB,erythrosin B andα-terthiophen was studied by histochemistry method.Results RB,erythrosin B andα-terthiophen showed less activity in dark.The killing effect to larvae could reach 100%using 10 or 25μg/ml RB and 100 or 150μg/ml erythrosin B after exposed to 320×102lx of light intensity generated by daylight lamp(100 W)for 6 h.The killing effect ofα-terthiophen also achieved 100%at the concentration of 1μg/ml after exposure to moderate or low intensity sunlight for 5 h.Erythrosin B andα-terthiophen was applied to control Ae.albopictus larvae in the clear water o...更多r muddy water of the field respectively.The result showed the killing rates of RB andα-terthiophen were 46% and 49%in the muddy water body,and 67%and 89%in the clear water body.However,that ofα-terthiophen reached 98%in the above mentioned water body after continuously exposed to strong sunlight.Severe pathological damage of larvae caused by RB,erythrosin B andα-terthiophen were observed with optical microscopic.The damage were as follows:villus of midgut disappeared,midgut cells swell and cell nucleus disappeared.Fat body widely distributed under the epidermis and the shape of malpighian tubes was abnormal and its lumens narrowed.Conclusion RB,erythrosin B andα-terthiophen are high-efficiency and applied photo-insecticides.

　　【Abstract】　Objective　To assess the killing efficacy of three  photosensitizers such as rose bengal（RB）, erythrosin B and  α-terthiophe to the fourth-instar larvae of Aedes albopictus in the laboratory and the field. Methods　The number of dead larvae was recorded after application of RB, erythrosin B and α-terthiophen at different illumination conditions, and experimental parameters affecting photoinsecticidal was analyzed. The toxicity mechanism of RB, erythrosin B and α-terthiophen was studied by histochemistry method.  Results　RB, erythrosin B and α-terthiophen showed less activity in dark .  The killing effect to larvae could reach 100% using 10 or 25 μg/ml RB and 100 or 150 μg/ml erythrosin B after exposed to 320×102 lx of light intensity generated by daylight lamp (100 W) for 6 h. The killing effect of α-terthiophen also achieved 100% at the concentration of 1 μg/ml after exposure to moderate or low intensity sunlight for 5 h. Erythrosin B and α-terthiophen was applied to control Ae.albopictus larvae in the clear water or muddy water of the field respectively. The result showed the killing rates of RB and α-terthiophen were 46% and 49% in the muddy water body, and 67% and 89% in the clear water body. However, that of α-terthiophen reached 98% in the above mentioned water body after continuously exposed to strong sunlight. Severe pathological damage of larvae caused by RB,erythrosin B and α-terthiophen were observed with optical microscopic. The damage were as follows: villus of midgut disappeared,  midgut cells swell and cell nucleus disappeared. Fat body widely distributed under the epidermis and the shape of malpighian tubes was abnormal and its lumens narrowed. Conclusion　RB, erythrosin B and α-terthiophen are high?efficiency and applied photo-insecticides.

Objective:To study on species and classification of Culicoides(Monoculicoides).Methods:Using bed-curtain,insect net and light trap to collect midges.Result:There were 10 species of Culicoides(Monovulicoides) known in China,in which C.(M .) stigma was described for the first time.The diagnosis of Culicoides(Monoculicoides) was described.It recorded that mean values of certain numerical characters.The characteristics of female and male of Culicoides(Monoculicoides) were given.Conclusions:Basis of faunal distribution and classification studies of Culicoides(Monoculicoides) in China are provided.

Objective:To investigate species and ecological habits of rodents in Xingkai Lakes.Methods:Rat trap method.Result:2177rodents belonging to 7 genera and 8 species were recorded from Xingkai Lakes of Heilongjiang province.The predominant species is Apodemus agraius(73.3%) in field,and Mus musculus(75.9%) indoors.The composition of rodents species varies with different habitats,places and months.The peak of active seasons for A.agrarius,M.musculus and Rattus norvegicus was from May to November.Conclusions:Ecological accordance is given for rat cotral in the Xingkai Lake area.

Objective:To comprehend the faunal and ecological circumstance of blood-sucking midges in frontiers of Russia and Heilongjiang province of China.Method:Bednet snare;Lamp snare;Netted method.Result:412989blood-sucking belonging to 2 genera and 35 species were recorded from Heihe city and Jiayin,Luobei,Raohe,Hulin,Dongning coutries.The predominan species were Culicoides punctatus(36.5%) and C.obsoletus(36.0%).The composition of species of blood-sucking midges varied with different habitats,places and months.The active durations were 140 days for C.punctatus,100 days for C.sinanoensis,80 days for C.obsoletus,60 days for C.pulicaris and C.pallidicornis,and 50 days for C.erairai.During active seasons,there was only one peak for C.pulicaris,C.pallidicornis and C.erairai,and two peaks for C.punctatus,C.obsoletusand C.sinanoensis.The observations on 4 species show that within 24 hours,two peaks of C.punctatus,C.sinanoensis,C.obsoletus and C.pulicaris appear at 1-2 hours front or after sunrise and sunset within 24 hours.

The results are reported in this paper of faunal and ecologica studies of gamasid mites in frontiers of Northeast China during 1980～1990. 7 989 gamasid mites belonging to 4 families,9 genera and 21 species were obtained.The predominant species are Laelaps jettmari (28.6%) and Eulaelaps stabularis (22.5%).The composition of species of gamasid mites varies with different mice,habitats and months.The mouse with higher infested rates by the gamasid mites is Apodemus speciosus (68.0%).Rattus norvegicus has the highest infested index (13.4) by the gamasid mites.During active seasons,there is only one peak for E.stabularis,and two peaks for L.nuttalli and L.jettmari.