Hernandez, Chabelita A. creator text City of Batac MMSU 2024 monographic eng

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xiv, 68 leaves : 29 cm. A field experiment was conducted to evaluate the effects of different botanical extracts against aphids on string beans at Barangay 13 Mabanbanag, Vintar, Ilocos Norte, from January to April 2023. Specifically, it aimed to: 1) evaluate the effect of different botanical extracts on the growth and yield of string beans; 2) assess the effect of different botanical extracts in controlling aphids and other pests of string beans; and 3) evaluate the profitability of using botanical extracts in string bean production. The study was laid out in a Randomized Completely Block Design (RCBD) with three replications. The treatments included untreated plants, commercial insecticides, chili, kakawate, and tobacco extracts. The results showed that the vine length of string bean plants, number of lateral branches, pod length, and the percentage of marketable and unmarketable pods were not significantly affected by the application of the different botanical extracts. However, yield per hectare was significantly higher in plants treated with commercial insecticide. During the first and fourth weeks of observation, the botanical insecticides showed significant effects in aphid infestation. Plants treated with tobacco extract had the lowest infestation, comparable to those treated with chili and kakawate extracts and untreated plants. Before the application, all treatments groups experienced moderate aphid damage, but after application, no damage was noted on the plants. The application of chili, kakawate, and tobacco extracts had a comparable effect on the reduction of aphid colonies. Plants treated with chili extract recorded the highest cost of production at Php 49,275.00. However, it also yielded the highest gross income compared to commercial insecticide at Php 96,250.00, net income at Php 49,225.00, and return on investment at 104.68%. Chabelita A. Hernandez Thesis (BS Agriculture major in Horticulture) -- Mariano Marcos State University-College of Agriculture, Food and Sustainable Development, Batac City Bibliography : leaves 45-50 MMSU 241210 20250807160600.0