Soil charactristics on factors governing the existence, recycling and persistence of Bacillus thuringiensis in Egypt

The simple correlation and regression analyses showed that the soil sand percentage and the available copper levels had significant negative and positive contributions, respectively, to the abundance and distribution of B. Thuringiensis in the Egyptian agricultural soil. Among B. thuringiensis isolates, only 11.26% of the strains showed larvicidal activity against Culex pipiens. The larvicidal potency LD50 varied from 5.01 x 105 to 5.4 x 106 spores per milliliter among the isolates

Application of bacillus thuringiensis in poultry houses as a biological control agent against the house fly, musca domestica sorbens

The efficiency of Bacillus thuringiensis [Bt] as a microbial housefly control agent was evaluated in one of the natural maggot breeding medium; namely, poultry feces. Two commercial formulations [a wettable powder and a liquid concentrate] were assayed against Musca domestica sorbens in synthetic fly breeding media and in chicken feces. The latter favored maggot breeding when compared with the synthetic one. Both formulations resulted in a significant reduction in maggot numbers, pupal development and adult emergence. The concentration significantly affected the adult emergence. The liquid concentrate induced higher larvicidal activity than dry powder formulation. Contaminated feces produced from orally fed chickens were significantly toxic to the breeding maggots reaching maximum larvicidal activity till the 4th day post-feeding feces and continued in less activity till the 6th day

Housefly distribution in certain general hospital in Cairo

Fly sampling was evaluated under laboratory conditions before starting the field surveys. Three different fly traps were tested, of which the Spiralettes [a commercial one] proved to be the most efficient. Sampling conditions were also considered in this laboratory evaluation, light, air current, swinging, height and temperature were tested, all of them have affected fly trapping except height. Fly density and distribution in two general hospitals and two specialized ones, were estimated in order to evaluate them epidemiologically in relation to hospital bacterial contamination. Results of these surveyes revealed the followings [I] The location of the hospital has no impact on the fly density. [2] Flies are attracted more to swinging hanged ribbon traps than to fixed ones. [3] Fly densities were relatively high in the main kitchens and the main garbages followed by toilets [common ones], patient wards, outpatients investigating rooms, surgical theaters and plasterrooms of the hospitals. [4] Fly density is higher during warm seasons than in cold ones