[Current data on the biology and response to insecticides of Anopheles mosquitoes in former endemic zones of southern Romania]. / Date actuale de biologie si comportament fata de insecticide a faunei anofeline din fostele zone endemice de malarie situate in sudul tarii.

In the 1976-1980 period biological and ecologic investigations were carried out on the Anopheles fauna in the former endemic malarial areas in the Danube plains and the Dobrogea. Due to the changes in the ecology of the region new aspects were observed among this fauna: 1) reduced anopheles density as compared to previous years; 2) change in the proportion of the Anopheles species; 3) resistance of the Anopheles to organochloride insecticides and sensitivity to organophosphoric and carbamate insecticides. The authors recommend the use of the Ficam W insecticide in doses of 0.3 g active substance per square meter for disinfestation against mosquitoes in houses.

[Action of some chemical products--insecticides and detergents--on the larvae of mosquitoes of Anopheles labranchiae atroparvus and Culex pipiens autogenicus species]. / Actiunea unor produse chimice--insecticide si detergenti--asupra larvelor de tintari din speciile Anopheles labranchiae atroparvus si Culex pipiens autogenicus.

The larvicide effects of some insecticides and detergents on the Anopheles labranchiae atroparvus species--laboratory colonie--and Culex pipiens autogenicus species, living in flooded basements of some block-houses in the town of Slobozia, were estimated. These products were classified in some categories, depending on their effects: 1. knock-down effect products ; 2. products having a relatively strong effect ; 3. products having a slow effect ; 4. products with a slight effect. Remanence tests were performed on Culex pipiens autogenicus, which showed that Toxid and Lindatox have a longer remanence than the other substances used. In mosquito larvae field control 1 ppm pyrethrum products like Decis and Isathrine, trichlorfon products like Clorofos, Dipterex and Dimetox and organophosphorus carbetox on both species are recommended.

[Studies of the sensitivity to the usual domestic insecticides on insects of the Anopheles maculipennis group, and Musca domestica, Cimex lectularius and Blattella germanica species]. / Urmarirea gradului de sensibilitate la insecticidele uzuale de productie indigena, a insectelor din grupul Anopheles maculipennis si speciile Musca domestica, Cimex lectularius si Blattella germanica.

The present paper was designed to the study of the degree of sensitivity of mosquitoes, flies, bedbugs and cockroaches to organochloride and organophosphoric insecticides produced in Romania. Testing of the sensitivity to insecticides of these species, important as transmitters of human pathogens, showed the effectiveness of the products, which induced a high mortality rate in relatively small concentrations. Against Anopheles labranchiae atroparvus, the insecticides Detox, Carbetox and Lindatox proved efficient in concentrations of 1.0%, 0.5% and 1.0% respectively. Against Musca domestica Lindatox and Detox proved efficient in 1.0% concentration. Cimex lectularius responded with a mortality rate of 100% to 0.5% Lindatox, 1.5% Plotox and 1.0% Dipterex. Against Blattela germanica, 100% mortality was obtained after one hour exposure to Lindatox, Detox and Carbetox in 1.0% concentration, to 3.3% Plotox and 1% Piretrin.

[Analogs of juvenile hormones in the control of insects of medical or sanitary importance]. / Analogii de hormoni juvenili în combaterea insectelor de interes medico-sanitar.

The growth and moulting or immature insects is related to three main groups of hormones : cerebral, ecdysonal and juvenile. Juvenile hormone analogues mark a new stage in the control of detrimental insects, and have significant advantages over the conventional insecticides. In order to establish the effectiveness of juvenile hormone analogues a series of biotests were performed : the wax pupal test, injections, systemic and topical applications, the treatment of food, pulverizations and exposure to vapors. In the laboratory, the efficiency of the analogues was tested against the following genera : Anopheles, Aedes, Culex, Culiseta, Musca, Stomoxys and Blattella, obtaining several effects, such as : lengthening of the larval stages, blocking of metamorphosis and ecdysis, blocking of the emergence of adults, morphogenetic ovicide, sterilizing and lethal effects, etc. Exploratory trials were performed in the field with compounds whose effectiveness had been demonstrated, against some Aedes, Musca, Stomoxys, Pediculus and Bovicola species. Laboratory experiments showed, however, that the insects might become resistant to juvenile hormone analogues.