The Occurrence of Insects, Fungi and Organoleptic Characteristics in Stored Coffee Beans in Lampung

Abstract

A survey on postharvest handling and technology processing of coffee beans at farmer, trader and exporter levels was conducted in West Lampung and Tanggamus regencies of Lampung province during harvest time (July 1998). Interviews and sampling of coffee beans were carried out during the survey. The number of respondents at farmer, trader and exporter levels was 22, 20 and 4, respectively, while the number of samples collected from each level was 20. All samples were analyzed for moisture content, physical quality, insect and fungal infestation, reducing sugar content, and coffee cupping. The results of the interviews indicated that postharvest handling and technology processing became better from farmers to exporters. Moisture contents of coffee beans collected from farmers and traders were higher than the tolerable limit recommended by SNI (13%). Physical quality of coffee beans collected from exporters was higher than that collected from farmers and traders. Insects were found on coffee beans collected from farmers, traders and exporters, but the number of species and the percentage of samples infested by insects from each level were relatively low. The predominant species was Liposcelis entomophila. The number of fungal species on coffee beans collected from farmers was higher than that collected from traders and exporters. The predominant species at the three levels was Aspergillus niger, but the lowest percentage of beans infected by this fungus was found on coffee beans collected from exporters. The lowest percentage of samples infected by all fungi was also found on coffee beans collected from exporters. Reducing sugar content of coffee beans collected from exporters was lower than that from farmers and traders. Aroma and flavor values tended to increase from farmers through traders to exporters, while the body decreased. Some off-flavors (i.e. earthy, mouldy, fermented and woody) were encountered in a few coffee samples from farmers as well as from traders. There was no off-flavor encountered in the coffee samples from exporters.

Post-harvest Fungal Infection in Arabica Coffee Beans (Coffea arabica Linnaeus) in the Coffee Center of West Sumatra Province, Indonesia

“…Lilia et al (2021) reported that the common postharvest fungus in coffee beans is A. niger. Dharmaputra et al (1999), who tested the level of fungal attack on coffee beans collected from traders in Lampung Province, also reported A. niger as the dominant fungus (46%). Furthermore, Yani (2008) stated that A. niger infects 100% of coffee beans during primary processing.…”

“…An insect causes seeds with one hole and more than one hole. According to Dharmaputra et al (1999), during storage, coffee beans can be affected by insects, mites, microorganisms, and rodents; insect pests are considered to be the most significant cause of losses. However, when the observation was carried out, no insect pests were found.…”

Sampling Lasioderma serricorne (Coleoptera: Anobiidae) in 2 coffee bean warehouses in New Jersey

“…Coffee is one of the most popular beverages in the world (Romano et al 2014). Like many other stored products, post-harvest green coffee beans are vulnerable to damage from a variety of insect pests such as drugstore beetle ( Stegobium paniceum [L.]) (De Ong 1948), coffee bean weevil ( Araecerus fasciculatus [De Geer]) and maize weevil ( Sitophilus zeamais Motschulsky) (Dharmaputra et al 1999). A study reported 22, 2, and 8 species from Coleoptera, Lepidoptera, and other insect orders from coffee warehouses in Colombia, respectively.…”