Ahmed Ramadan El-Rokh

Plant Protection Research Institute (PPRI) | PPRI · Department of Piercing and Sucking Insects

Piercing sucking pests are destructive to many strategic crops all over the world. Botanical pesticides can be used to control these pests. A new withanolide derivative 3 named sominone A ((20 R ,22 R )-1 α ,3 β ,20,27-tetrahydroxywitha-5,24-dienolide) was isolated from the alkaloid fraction of the whole plant of Withania somnifera . In addition, t...

The compound 1,3-diphenyl-1H-pyrazole-4-carbaldehyde (1) was utilized as a fundamental component in the synthesis of novel N-phenyl pyrazole derivatives. Substituted N-phenyl pyrazole compounds including 2-cyano-3- (1,3-diphenyl-1H-pyrazol-4-yl)-N-Substituted-acrylamide derivatives (4a–h), 4-(hydrazineylidenemethyl)-1,3-diphenyl-1H-pyrazole (6) and...

Cotton aphids, Aphis gosspyii and cotton jassids, Amrasca biguttula are destructive piercing sucking pests to many strategic crops, especially cotton, not only in Egypt but also all over the world. Using synthetic pesticides to control these pests led to several deleterious impacts. Natural pesticides can be used as a harmless alternative. Nine com...

Chemical insecticides caused several problems to different organisms and environment, natural control is one the solution to reduce the use of pesticides. The effectiveness of some plant extracts was evaluated against some pests of the order Lepidoptera, Spodoptera littoralis (Boisd), Spodoptera exigua (Hb) and Herpetogramma hipponalis which feed o...

As alternatives to chemical insecticides, entomopathogenic fungi or wild plants and their secondary metabolites are being used. These biocontrol agents are significant because of their biodegradability, specificity, eco-friendliness, and utility as agents to reduce insecticide resistance. In this study five ethyl acetate extracts of locally isolate...

The Mediterranean fruit fly (MFF) Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) is considered the most economically important pest attacking many fruit hosts. The present study was conducted under field conditions of a mandarin (Citrus reticulata Blanco) orchard in Dakahlia Governorate, Egypt aiming to evaluate di-ammonium hydrogen phosphat...

Crude methanol, petroleum ether, methylene chloride, ethyl acetate and butanol extracts from Nitraria retusa and their isolated compounds as well as volatile oil from Echium angustifolium were tested for their insecticidal activities against Aphis craccivora and the third instar nymphs of Bemicia tabaci. Butanol extract of N. retusa was the most ef...

Four previously undescribed sucrose diester of aryldihydronaphthalene-type lignans, named echiumins A-D, were isolated from the butanol fraction of Echium angustifolium Mill, in addition to a known compound, trigonotin A, which is reported for the first time from the title plant. The structures of isolated compounds were elucidated using spectrosco...