#TITLE_ALTERNATIVE#

• Main Author: SUPRIANI (NIM: 10614012), WINA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31638
• Institution: Institut Teknologi Bandung

<p align="justify"> Sweet potatoes (Ipomoea batatas Poir.) is a root vegetable with suprising number of nutrient categories for the health benefits, which can be used both as an alternative staple food in the dry season and as substitute food in food diversification efforts. In sweet potato’s cultivation, farmers often experience crop failure, one of which is due to pest attack caused by Cylas formicarius Fabr. weevil. Tagetes erecta Linn. (tagetes) has been reported to have an insecticide effect onvarious pests that attack plants. The aim of this research was to determine the effect of Tagetes plant on the growth of sweet potato plant and the intensity of weevil attacks on Cilembu sweet potato cultivation. The experiment was conducted in Desa Cigendel, Kabupaten Sumedang, West Java using randomized complete design. Treatments included TC (plot with Tagetes and Cylas), T (plot with Tagetes only), C (plot with Cylas only) and K (plot without Tagetes and Cylas) as controls. Tagetes were planted around the plot and in each treatment plot 20 Cylas/plant were introduced. Results showed that the presence of Tagetes and Cylas or Tagetes alone or Cylas alone had an effect on the growth of sweet potato, although it was not significantly different compared to the control. The presence of Tagetes reduced the intensity of pest attacks. The intensity of weevil attack on the plot of K, T, TC, and C were 34%; 9%; 16% and 62%, respectively, with an average number of Cylas per tuber were 38 larvae, 8 imago; 14 larvae, 6 imago; 15 larvae, 8 imago; and 72 larvae, 23 imago, respectively. Tuber dry weight in plot where Tagetes was added, showed an increase compared to control (T: 46.69 g, TC: 42.66 g compared to K: 37.69 g) while in plot C, tuber dry weight showed the lowest value of 34.90 g. Phytochemical assay showed that different plant organ contained different type of secondary metabolite, but only flower contained all secondary metabolites tested including alkaloids, terpenoids, phenols, tannins, flavonoids, and coumarin. GC-MS analysis on Tagetes root, shoot and flower extract showed that &#945;-terthienyl (2, 2 ': 5 ', 2 ''-Terthiophene), which has been widely reported as one of the active compounds with insecticidal effect, present only in root and flower. From this study, it can be concluded that planting Tagetes around sweet potato plants can reduce the effect of Cylas on the growth of sweet potato as well as the intensity of pest attacks and &#945;-terthienyl compound is likely to play a role in the reduction of pest attacks. <br /> <p align="justify">