KEHADIRAN SERANGGA PENGUNJUNG BUNGA TERHADAP PRODUKTIVITAS KOPI (COFFEA ARABICA VAR. TYPICA) DI KEBUN KOPI PALINTANG, BANDUNG, JAWA BARAT

• Main Author: Angelique, Bianca
• Format: Final Project
• Language: Indonesia
• Subjects: Ilmu hayati ; Biologi
• Online Access: https://digilib.itb.ac.id/gdl/view/57724
• Institution: Institut Teknologi Bandung

Insects play an important role in increasing crop yields. The global decline of insect number and diversity affect the ecosystem services including pollination service. Arabica coffee (C. arabica) is one of many crops that benefits from the visitation of insects. Arabica coffee has an important economic, social, and also ecological role especially in the Palintang area. The aim of this study is to observe insect visitation on coffee flowers and its effect on fruit set, biomass, and the size of coffee fruit in Palintang coffee plantation. This study was held in two different locations with different intensity of understory trimming. Insect visitations on coffee flowers were observed every hour from 09.00 to 15.00 with 25 minutes observation time. Every insect visiting coffee flowers were counted, captured, and later identified. Vegetation structure and composition in each location was analyzed using quadratic method. The climatic conditions were recorded every one hour using a data logger. To observe the effect of insect visitations on coffee productivity, flower buds were enclosed with mesh bags. Coffee productivity was observed based on fruit set, fruit fresh weight, and also fruit perimeter. Fruit set is the ratio of developing fruits to initial flower buds in each branch. To observe the fresh weight and perimeter, 20 fruits from each branch were taken starting from the 6th to the 23rd weeks after flowering. The results showed a higher visitation in non-intensive location (250 insect visitations, 28 species, 14 families, and 5 ordos) compared to intensive location(184 insect visitations, 23 species, 11 families, and 3 ordos. Insect visitations significantly increase fruit set with the average of 8,41% in non-intensive location and 5,21% in intensive location. Insect visitations also increase the fruit fresh weight significantly with the average of 6,28% in non-intensive location and 4,27% in intensive location. In this study, it was observed that the fruit perimeter was not affected by insect visitation (p>0,05).