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The National Council for Scientific Research (CNRS) is a public institution established in 1962 and assigned with the task of formulating national science and technology policy, initiating, guiding, supporting and conducting scientific research programmes and activities in Lebanon. It advises the Government on all science and technology issues. The CNRS conducts research through its specialised centres and supports research projects having an impact on the socio-economic development of the country. The CNRS is a public autonomous institution re [...]

The larvae of pea weevil (Sitona spp.) is a serious pest on N2-fixing nodules of lentils (Lens culinaris, Medik.) in West Asia and North Africa. During the 1981/82 season in the Beqa'a plain in Lebanon, the effects of chemical treatments and N fertilization on Sitona damage and yield were studied on two microperma lentil cultivars: 'Lebanese local' and 'Syrian local small'. The seven treatment ...

SUBJECT: formation de nodosites; variete; insecte nuisible/ insecticide; control quimico; lutte chimique

POSTED TO: Bulletin scientifique libanais [0256-7482]

A study of eight successive years was carried out at different sites in the Egyptian western desert to clarify the role of invertebrates on desert ecosystems. It is concluded that: (a) the occurrence of injurious species is related to the phenology of the host plant and the abundance of any particular species varies from one site to another within an ecosystem; (b) some plants form unknown fac ...

SUBJECT: arabia saudita; ecosysteme; egipto/ medio ambiente; desiertos; egypte/ environnement

POSTED TO: Arab Journal of Plant Protection [0255-982X]

Okra yellow leaf curl disease, which was observed for the first time in Iraq, was studied under plastic house conditions (15-20 deg C and 80-90% relative humidity). Studies showed that the disease is caused by a virus, and the agent can be transmitted by the white fly Bemicia tabaci Genn. and by grafting. Plants infected with the virus showed symptoms of stunting, leaf curling and yellowing in ...

SUBJECT: hibiscus esculentus; irak; virus des vegetaux; virose; aleurode

POSTED TO: Arab Journal of Plant Protection [0255-982X]

A survey was conducted to identify viruses affecting dry bean (Phaseolus vulgaris) and cowpea (Vigna unguiculata) in Lebanon. Three hundred and thirty four samples exhibiting virus-like symptoms were collected from 13 different locations during the fall growing season of 1984. Samples were stored at 20 deg C until they were tested by the enzyme-linked immunosorbent assay (ELISA) for the presen ...

SUBJECT: elisa; virus des vegetaux; libano/ identificacion; phaseolus vulgaris; liban/ identification

POSTED TO: Arab Journal of Plant Protection [0255-982X]

In the present study, 10 bird species of 8 families belonging to 3 orders were recorded as attacking agricultural crops in Northern Iraq. Five species are resident birds, while the others are migrants. The host crops and timing damage were also studied. The recorded species are: collard dove, Streptopelia a. decaocto; rack dove, Columba livia gaddi; crested lark, Galerida cristata; rook, Corvu ...

SUBJECT: columbiformes; irak; oiseau nuisible; coraciiformes; pajaros nocivos

POSTED TO: Arab Journal of Plant Protection [0255-982X]

Proper timing for treatment of Botrytis rot of grapes is closely related to periods of infection. Conidia are produced by overwintering Sclerotia and seem to grow best at relative humidity above 90% and temperatures of 15-20 degrees C. Infection takes place mainly in spring when grapes are in flower, and flower parts are the main site for infection. Stamens die and some remain attached to the ...

SUBJECT: infection; cycle de developpement; botrytis; pourriture/ humidite; ciclo vital

POSTED TO: Arab Journal of Plant Protection [0255-982X]

A nutrient medium for successful in vitro growth of pinks (carnation) meristem tips was developed. Clones of 6 pinks varieties were freed from Carnation etched ring virus (CERV), Carnation ring spot virus (CRSV) and Carnation vein mottle virus (CarVMV). CERV and CRSV were eliminated by meristem tip culture alone, but more easily when prior heat treatment was applied. CarVMV was eliminated only ...

SUBJECT: cultivo de yemas; calor; virus des vegetaux; niveles troficos/ control de enfermedades; chaleur

POSTED TO: Arab Journal of Plant Protection [0255-982X]

Un programme de recherche a ete entrepris entre le 22 mars et le 2 juillet 1982 dans le but de realiser une etude detaillee de la poussee phytoplanctonique printaniere dans deux stations au centre de la cote libanaise. Des parametres hydrologiques, hydrobiologiques et biologiques sont mesures et les populations microplanctoniques sont determinees et comptees. L'evolution thermique conduit a l' ...

SUBJECT: lebanon/ population; metodos; life cycle; hydrobiology; mathematics

POSTED TO: Bulletin scientifique libanais [0256-7482]

The present study reports on a survey of natural enemies where over 20 species of predators and parasites were collected in the period 1982-1983. Efficiency of some of these natural enemies was studied. Parasitism of Aphidius spp and Aphelinus spp on aphids ranges from 60-90% in greenhouses: Percentage of parasitized aphids ranges - in the field - from 5-30%. Calosoma chlorostictum, a predator ...

SUBJECT: emirats arabes unis; enemigos naturales; emiratos arabes unidos; ennemi naturel; lutte biologique

POSTED TO: Arab Journal of Plant Protection [0255-982X]

A study on the effect of trifluralin (alpha, tridluro - 2,6 -dinitro-N,N - Dipropyl-p-toluidine) showed that this herbicide depressed germination, root and shoot development till 5 leaf stages, and resulted in decreased root nodulation in the plants by about 3%, under field conditions in the Beqa'a plain of Lebanon. A supporting study with chickpea plants conducted in pots in Beirut showed sim ...

SUBJECT: formation de nodosites; crecimiento; cicer arietinum; croissance; substancias toxicas/ deterioro

POSTED TO: Arab Journal of Plant Protection [0255-982X]