and Suren Leaf (Toona sureni Merr.) Extracts for Controlling Pests (Plutella xylostella Linn.) on Broccoli Brassica oleracea L. Plants
Broccoli (Brassica oleracea L.) is an important vegetables that has high economic value and is widely cultivated in Indonesia as a response to demand for this commodity which continues to increase from year to year. Plutella xylostella L. is one of the main pests of this plant. The larvae of these pests damage plants when they are 2-6 weeks old, by eating the undersides of plant leaves to such a degree that the plants cannot grow normally and the results are unfit for sale. This study aims to determine the effectiveness of a mixture of suren and soursop leaf extracts to control Plutella xylostella pests on broccoli plants. This research was carried out from January to April 2023, using a randomized block design (RBD)consisting of 6 concentrations of botanical pesticides, namely P1 = control (without soursop and suren leaf extracts); P2 = 70 g/l soursop leaf extract + suren leaf extract mixture (1:1); P3 = 80 g/l Soursop leaf extract + suren leaf extract mixture (1:1), P4 = 90 g/l Soursop leaf extract + suren leaf extract mixture (1:1), P5 = 70 g/l soursop leaf extract, P6 = 70 g/l suren leaf extract, each treatment was repeated 4 times. The results showed that the botanical pesticides of soursop leaf extract and suren leaf extract, either singly or in a mixture of the two, were able to reduce the intensity of plant damage, larval mortality, and increase the yield of broccoli plants. The application of 90 g/l mixture (1:1) of soursop leaf extract + suren leaf extract was most effective in reducing the intensity of plant damage, larval mortality, and increasing the yield of broccoli plants. At the same concentration, the mixture of soursop leaf extract + suren leaf extract had no significant effect compared to the single application of the two insecticides.