Journal of Phytopathology and Pest Management (Al-Azhar University)
Not a member yet
133 research outputs found
Sort by
Biological control of the predominant seed-borne fungi of tomato by using plant extracts
Get PDFAqueous extracts from five wild traditional medicinal plants (Achillea fragrantissima, Balanites aegyptiaca, Peganum harmala, Rumex vesicarius, and Urtica urens) which were collected from different locations in Egypt were tested against the predominant fungal pathogens (Alternaria alternata f. sp. lycopersici, Â A. Â solani, Fusarium oxysporum f. sp. lycopersici and Rhizoctonia solani) infested tomato seeds . All the aqueous plant extracts significantly inhibited the mycelial growth and spore germination of these fungi, but the extract of A. fragrantissima exhibited the strongest antifungal activity. The maximum seed germination, plant emergence and seedling vigor was detected after the treatment of tomato seeds with 10% A. fragrantissima extract. Pathogenicity testing of tomato seeds by predominant fungi indicated positive infection of tomato seeds but A. solani had the most aggressive infection. In greenhouse experiment, the aqueous A. fragrantissima extract reduced disease severity but increased total pigments, total phenolics and fruit yield
Detection and quantification of pesticide residues in selected vegetables of Bangladesh
Get PDFA survey was conducted in intensive vegetable growing area in the Narsingdi district of Bangladesh regarding pesticides used by farmers on three major vegetables like eggplant, cauliflower, and country bean. On the basis of questionnaires, 23 farmers were interviewed and it was noted that fourteen pesticides belonging to different groups were found to be commonly used on the selected vegetables by the respondent farmers to control the major pests. In two selected locations of Narsinghdi 8.33 to 45.00 percent farmers were recorded to apply different pesticides every day and in some cases even twice in a day on vegetables. A total of 42 samples were collected from fields and markets and multiple pesticide residue analysis was done by Gas Chromatography (GC) with Flame Thermionized Detector (FTD) and Electron Capture Detector (ECD). Out of 42 samples, 27 had pesticide residue. Among these 27 samples, 14 samples had pesticide residues above the Maximum Residue Limit (MRL). The detected pesticides were Diazinon, Malathion, Quinalphos, Fenitrothion, Cypermethrin, Fenvalerate and Propiconazole.Â
Variations in certain biological aspects of the cotton aphid, Aphis gossypii Glover (Homoptera: Aphididae) in relation to color of its forms
Get PDFThe stock populations of two groups of Aphis gossypii Glover (Homoptera: Aphididae) were collected from cucurbitaceous plant leaves cultivated in Assiut and the New Valley Governorates, Egypt. Both aphid groups were brought into the laboratory and used as base line of pirimicarb resistance. Pirimicarb LC50 base line was determined by the dipping technique in successive concentrations of the trade form of pirimicarb mixed in water. The LC25 was determined monthly throughout two years and used in the selection.. This procedure resulted four aphid forms at each location (i.e., base line, mixed, light color, and dark color). It was found that the total nymphal duration of dark forms collected from both locations did not vary significantly from the base line forms. Data of the reproductive biology of aphids from both locations showed that the fecundity period, longevity and productivity of the dark morphs were significantly higher than those of the base line ones