With the human-luring method and menbranefeeding teehnique, We conducted the studies On the biting/sucking tendency of two important malaria vectors in our country, Anopheles sinensis and An anthrorophaqus to the human host with different blood groups. The. experimental results indicated that these two species are capable of selection to the host with blood type B, to the type B blood in vitro and to the plasma rather then the susperison of blood cells or the whole blood, The results were discussed of briefly upon the discovery of plasma Protien analyzed with high performance Liqiud choromatosraphy (HPLC).

The article deals with a series of toxic study of Bassa mosquito-repellent incense sold in the market. The incense contains 3.3% of raw Bassa jnice of which the purity is 96% Experimental results showed that the acute inhaling toxicity of the incense was not severe and nothing abnormal was found in subacute inhaling toxicity. Both the micronucleas test with spinal cord of mice and Ames test are negative, Sperm malformation of mice is not apparent. The results of accumulated experiments indicate that Bassa incense belongs to the weak accumulating substance. All results of this study suggest that if the purity of raw Bassa is ensured to be over 96% and the given dosage is to be controlled under'3.3%, the incense is relatively safe in practical utilization.

The pupal parasite Nasonia vitripennis (Walker) was released for 14 weeks on field stack of soy diatillers: grains in Shanxi province for control of house fly and other filth flies. The decrease of the field: densities on the release site of house fly, stable fly, Calliphoridae species and Sarcophagidae apecies averaged 59.9%, 32.2%, 24.5% and 14.5%, respectively. Parasitism of house fly pupae averaged 41.6% on the release site and 14.2% on the check site. The strains of N. vitripennis used in this study were effective in controlling house fly populations under the conditions imposed and at the numbers released.

Among the eleven species of infection solution of PfDNV, we discoveredthat the strongest infection one, was the first separated supernatant. It has the shortest LT ₅₀ (only 44 days) and the highest death rate 97.92%.

This is a report of studies on the overwintering of oothecal parasite Tetrastichodes sp. within the oothecae of cockroach Periplaneta fuliginosa and especially taking low temperature to store parasitic ootheca by first utilizing natural overwintering rule. 1. After their overwintering within the oothecae, the Tetrastichodes sp. emerged during the 54 days period next year from the second ten days of May to the first ten days of July The emerging peak was in the second ten days of June, 46.6 percent of the total number emerged daring these ten days; 2. This species lived through the winter in the prepupa stage. 25.9 percent of them developed from prepupa to pupa, when the monthly average room temperature was 16.8℃, And oothecae that had developed into adults appeared for the first time; 3. Adult may be delayed emergence period 1 to 4.5 months, when it is stored 123 to 132 days in low temperature. The emergence percentage has a little reduction by elongating the store-time. This can be used as a technique to store parasitic oothecae and control the time and number of adult emergence; 4. After being stored in low temperature, the oothecae mist not be placed directly in a place of high temperature and low relative humidity, otherwise, vast majority of parasites may die within the oothecae; 5. Storing in low temperature the parasitic oothecae of Periplaneta americana of the same year may delay the emergence of Tetrastichodes sp. for at least 1～2 months. The emergence percentage is not evidently different from that of the control group.

The present study is reported to describe the internal anatomical structures of gamasid mite, Ornithonyssus bacoti by the paraffin section, and shick freezing transparent section which was setup in our Iaboratory. The trachea of the O. bacoti is divided into five parts: the main tracheal trunk, accessory main tracheal trunk, fine trachea, tiny trachea and capillary trachea supplying on the cells. The digestive tract of O. bacoti is a relatively simple thing. It is comprised of a pharynx, a thin walled esophagus, a rather small midgut, three pairs of cecum attaching to the midgut, a small hindgut, the rectal sac and anus. The female system consists of one ovary, a short oviduct, an uterus, and genital pore, two accesorysglands and a spermatheca. The gonotrophic cycle of the mite has been demonstrated by thick freezing transparent sections prepared from femal gamasid mite ( O. bacoti.)

This paper reports the day and night active law of residual domestic rodents that we observed in a military camp site with the nine-well powered-spots method. In 12 days and nights within 6 months, the positive spots of Norway rat in 4 indoor sites were 3312, positive rate 7.52%, average 11.50 per hour. The positive spots of house mouse were 117, positive rate 0.27%, average 0.41 per night, rat acted from 18 o'clock to 8 o'clock next morning and mouse acted from 20:00-8:00. Both hour. In the species did not act in daytime. The active peak of rat was 2:00-4:00, and of mouse was 24:00-2:00, the action of both species of residual domestic rodents differed in quantity and frequency with season.

1. Thiswook was carried out in Putian county, from Mar. 1987 to Feb. 1989. 2841 specimens were collected. Average capture rase was 19.73%. 2. There are four species in house rodents. Mus musclus was dominant species of house rodents, being 56.88% of the whole house rodents. There are obvious seasonal variations of specific composition in house rodents. 3. Using regression analysis, the positive correlations between the population denslty of Mus musculus and Rattus flavipectus (r=0.518>r0.01, n=24), Mus musculus and Ruttus norvegicus (r=0.408>r0.05, n=24) were disocverred, and there was no correlation between the population density of R. norvegicus and R. flavipectus(r=0.081>r0.05). 4. There was obvious succession of house rodents community from 1950s to 1980s. The dominant species of community were R. flavipectus, R, norvegicus and Mus musculus in turn.

The substitute grain poison bait for rodent control (SGPB) selected from 8 candidate materials consints of 17.5% distillers' grains of wine, 17.5% distillers' grains of vinegar, 25%peng-run soil and 40% maize flour to spare 60% grains. Compared with the normal grain bait of maize flour, the acceptance coefficients of the SGPB were 0.72 for albino rats and 0.46 for brown rats. When an attractant was used in it, the coefficients mounted to 1.38 for albino rats and 0.56 for brown rats. The percentage Kill of its 1% sodium diphacinone poison baits were all 10/10 in both the choice feeding test and and non-choice feeding test for brown rats. The results of the field trials showed that the SGPB may be used completely instead of normal gain poison baits for rodent control.

In order to understand the spreading of EHFV aerosol among animals, the animals infected with EHFV and normal animals wese raised together in the same room. The EHFV antigen was positive in the normal animals 15 days after the EHFV antigen positive in the animals infected with EHFV. In the peak period of EHFV antigen positive rate in the animals infected with EHFV, twz strains of EHFV were lsola ted from air in the raising room. The above results suggestedthat EHFV could be spreaded among animals by aorosol and EHFV could exist in aerosol form, which is verg important in study on spreading ways of EHFV.

24 mice recovered from initiative sporozoite inoculation after administration with cholroquine were challenged again with sporozoites of salivary glands of infected Anopheles stephensi with P. yoelii, one of them was found reinfected with low level of parasitemia. While of 26 mice recovered from initiative blood inoculation after administration of chloroquine three of them were reinfected by challenge with blood inoculation. But after two cycles of inoculation and drug cure no reinfection was detected at all in the two groups challenged again with sporozoites or positive blood respectively. This result indicates that infection of p. yoelii has shown a stronger protective immunity in mice. however, it is still incomplete. When P. yoelii gametocyte-carrying mice were fed to batches of A. stephensi, 5 of is mice showed infectivity 10 to 20 hours later after administring chloroquine (6mg base/18～20g), and at 20 to 24 hours later after administration of chloroquine the mice were found more less infective to A. stephensi.

Periplaneta americana could be induced to produce antibacterial substances in the haemolymph by injection with live E. coli, heat killed S. aureus, P. aeruginosa and saline or treatment with ⁶⁰Co γ-rays, and with different respones. The haemolymph from the insect vaccinated by heat killed S. aures and P. aeruginosa was more active against bacteria than that by live E. coli or treated with ⁶⁰Co γ-rays. It was found that the haemolymph was efficient against several Grampositive and Gram-negative bacterial strains. It was also found that the haemolymph activity against P. aeruginosa and S. typhi was stronger than the antibacterial activity of the pieces of paper contained 10μg gentamicin or 30μg chloramphenicol, respectively.

The use of lacquer-based formulation can improved the residual performance of insecticides. The project selected 6 lacquers and 5 insecticides, and 46 lacquer-based formu-lations were prepared. Laboratory evaluation of the toxic effects was made on the German cockroaches. It was after a series of screening that "93836" insecticidal lacquer was developed. This insecticidal lacquer was applied on plywood plates and ceramictile tiles measured 15×15cm with paint brush at 200g/m ². Testing results indicated that "93833" had good effect on cockroach for at least 2 years. The KT ₅₀ of the testing panels which lasted upto 104 weeks at 28℃ was 14.65～17.30 min and the mortality was 100% in 48 hours. The KT ₅₀ of panels which lasted upto 10 weeks at 50℃ was 10.23～12.59, and mortality was 100% in 48 hours. Field study was conducted on the 12 Naval vessels. Results showed that single application of "93833" achieved excellent result in cockroach control. In comparison with 5 control vessels, related population index(RPI) upto 4 months was 8.29.

A wide-scale campaign of cockroach elimination was launched in Ningbo city in 1992, in order to reach the state standard. Adult and nvmph infestation rate dropped from 28.59% down to 2.27%. and its density index(individual/room) dropped from 2.57 to 1.92. Dropped on ootheca infestation rate from 7.79% to 1.38%, and its density index from 2.08 to 1.37. After the campaign, all indexes reached the "Double five" and "Double two" standards.

Tetrastichodes sp and Evania appendigaster are found to be the natural enemy of Blatta ootheca which is common indoors in Taizhou Prefecture, Southeast coastal area of Zhejiang Prouince. Tetrastichodes sp makes up 90.38% of the parasitic wasp, It can parasitize in every common Blatta ootheca. Their natural parasite rate is 11.87%. The natural parasite count reaches 70.6 in enery ootheca. Therefore, it is expected to prevent and treat the Local Blatta. The natural parasite rate of oothecal parasitic wasp is related with the wasp type. Blatta host and the natural parasite count in ootheca.

The present paper is on the effectiveness of larvicidal Sumilarv 0.5G against the larva of Culex pipiens pallens and Musca domeslica. It has been proved by the field trial that pupation and emergence of the two speeies of pests can be inhibated, and this effectiveness can persist for as long as 35 days.