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The present study investigates the insecticidal and herbicidal effects ofleaf extracts from two plants were harvested in the Northern Algerian Sahara.These are Cleome arabica (Capparaceae) and Pergularia tomentosa(Asclepiadaceae). The efficacy of the extracts from the plants was evaluated bythe reflux extraction method. The phytochemical screening of the aqueousextracts of C. arabica shows a remarkable richness in active principles incomparison with the extract of P. tomentosa; including flavonoids, saponosides,glycosides, terpenes, sterols, deoxyose, polyphenols and total alkaloids. Theimago of Tribolium confusum treated with aqueous extracts of C. arabica and P.tomentosa at doses of 80% to 100% respectively have mortality rates of 73.33%to 96.67%, and 36.67% to 86.67%. The lethal time 50 (TL50%) of the aqueousextract of C. arabica was estimated about 6.41 days, and 6.94 days for theextract P. tomentosa for the imago of T. confusum. The extracts of P. tomentosais less toxic than the extracts of C. arabica. The allelopathic potentials ofC. arabica and P. tomentosa tested on germination of the seeds of a weedDactyloctenium aegyptium (Poaceae) and two cultivated species, includingHordeumvulgare and Triticumdurum (Poaceae), show that the inhibitory effect ofextracts of C. arabica is very highly significant. It manifests itself in thegrowth of the aerial and underground part of the H. vulgar and T. durum. Theinhibition rate is more than 84.44% for D. aegyptium seeds treated with thedifferent concentrations. The inhibition rates range from 75.56% to 91.11% forT. durum wheat irrigate at 80% to 100%, but are only 55.56% to 77.78% forbarley seeds treated with the same concentrations (80% to 100%).

Comparative study of the biological activities of the aqueous extracts of two spontaneous plants harvested in the Algerian Sahara