Th. 3e cycle--Sci. nat.--Bordeaux 3, 1986.

Th. 3e cycle--Sociol.--Nice, 1987.

Th. 3e cycle--Géogr. et aménage.--Pau, 1987.

No description available.

A four-year (1988 to 1991 inclusive) field and laboratory study was undertaken to determine and select the components that could be integrated to control the sorghum shoot fly, Atherigona soccata Rondani (Diptera: Muscidae), in Burkina Faso, West Africa. Nine approaches were investigated: (1) monitoring adult shoot flies; (2) sequential sampling based on egg and dead heart counting; (3) cultural practices (sowing dates and plant densities, intercropping sorghum-cowpea); (4) use of resistant cultivars; (5) use of natural insecticide from the neem tree Azadirachta indica A. Juss. (Meliaceae); (6) effects of intercropping sorghum-cowpea on the natural enemies of the shoot fly; (7) spider fauna in pure sorghum and intercropped sorghum-cowpea; (8) parasitism of the shoot fly by a larval parasitoid, Neotrichoporoides nyemitawus Rohwer; and (9) the biology of an egg parasitoid, Trichogrammatoidea simmondsi Nagaraja. These nine approaches were divided into four main components: (1) monitoring populations, (2) cultural practices, (3) natural and chemical pesticides, and (4) biological control that could be integrated to control the shoot fly. Among these components, monitoring populations (egg sampling), cultural practices, and use of natural pesticides could be utilised at the farmer level.

A three-year (1991-1993) investigation was done in the field and laboratory to study the bionomics of Smicronyx guineanus Voss and Sm. umbrinus Hustache and the spatial distribution of Striga hermonthica (Del.) Benth. Studies on the life history of the weevils were undertaken. Seasonal activity and habits were established by monitoring life stages in the field. A behavioral Time Budget of Smicronyx adults was established in semi-field conditions. Dispersion patterns and the optimum sample size for Smicronyx and Striga were determined. Smicronyx adults as well as Striga plants were aggregated in the field. Smicronyx larvae were located in the upper stratum of the witchweed (93.2%) where they make galls and destroy large number of seeds. The effect of precipitation on emergence of Smicronyx adults was investigated in the insectary. The optimum rainfall required for Smicronyx adult emergence ranged from 30 to 40 mm. Good synchrony and positive association of Sm. guineanus and Sm. umbrinus with S. hermonthica were observed. There are good prospects for augmentation and/or conservation of Smicronyx populations as part of an integrated control strategy of S. hermonthica.

Frankfurt (Main), Univ., Diss., 2004. / Dateien im PDF-Format. Computerdatei im Fernzugriff.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1972. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 245-249).

Frankfurt (Main), Universiẗat, Diss., 2004. / Dateien im PDF-Format.

No description available.