This study was conducted at Horticulture Research Station of El-  Baramon, Dakahlia Governorate in both seasons (2007/2008 and2008/ 2009) to study the effect of six spraying treatments with some aromatic of plant extracts. Namely ethanol extract of Thyme (T₁),  aqueous extract of Thyme (T₂), ethanol extract of Basil (T₃), aqueous extract of Basil (T₄), ethanol extract of Lavender (T₅), and aqueous extract of Lavender (T₆)   on the control of Spodoptera littoarlis and plant growth, yield and its component of three sweet potato cultivars "American 93", "Beure Gard" and "Abeese". The activity of some plant extracts against the cotton leaf worm was evaluated and expressed as the reduction in worm infestation by applying three spraying applications with an interval of a month during the two summer seasons of 2008 and 2009. The water extracts of a defected result in both season and the "Abeese" was the lowest infestation.        Regarding the effect of cultivars on growth parameters data showed that "Abeese" significantly produced higher leaf area, total and marketable yields, average fresh weight tuber root and tuber dry matter precentage compared with the other two cultivars. While "American 93" exceeded the other two cultivars in number of leaves and branches, main stem length and starch percentage in tuber in both seasons. Data revealed that the canopy dry weight per plant was higher in "Beure Gard" as compared with two cultivars. In general, results indicated that the aqueous extract of basil increased significantly all growth parameters, i, e, leaf area, number of leaves and branches and main stem length, yield and its component (total yield, marketable yield, and average fresh weight of tuber root) and dry matter percentage of tuber root, compared with other treatments applications. In this respect, results showed that "Abeese" plants treated with the aqueous extract of basil gave the highest values in all growth characters, yield and its component and dry matter percentage of tuber root.         The combined treatments of cultivars and plant extracts generally were more effective with using the aqueous extract of basil on "Abeese" where this combination showed the highest values of leaf area, yield and its component and tuber root dry matter percentage, while the same extract increased number of leaves per plant, main stem length (cm) and starch percentage when it was used an "American 93" plants. Finely, it is recommended that the "Abeese" plants treated with the aqueous extract Basil produced the highest values of plant growth, yield and its component, dry matter and showed the lowest infestation of Spodoptera litoralis