2010/01/01 by Koukichi Nagasaka, Naoyuki Takahasi, Toshihiro Okabayashi · 1 citation
Agricultural and Biological Sciences · #Agronomy #Aphid #Biological pest control #Biology #Botany #Ecology #Greenhouse #Horticulture #Host (biology) #Insect-Plant Interactions and Control #PEST analysis #Parasitism #Plant Parasitism and Resistance #Plant and animal studies
paper · pdf · doi:10.1303/aez.2010.541
crossref issued 2010/01/01 · crossref published 2010/01/01 · crossref published-print 2010/01/01 · openalex publication_date 2010/01/01 · crossref created 2010/11/30 · crossref deposited 2021/05/20 · openalex created_date 2025/10/10 · crossref indexed 2026/08/03 · openalex updated_date 2026/08/04
In order to elucidate the impact of secondary parasitism on a banker plant system, aphid parasitoids on banker plants were surveyed for four years in commercial greenhouses producing eggplant and sweet pepper in Kochi Prefecture, Japan. A banker plant system using Aphidius colemani was introduced into the greenhouses in November or December for the control of pest aphids from February through May. The mean rate of secondary parasitoids to total parasitoids on the alternative host aphid (Rhopalosiphum padi) on banker plants was less than 35% in the early season. In March or April, the mean rate exceeded 40%, and was more than 70% by May or June. Three main species of secondary parasitoids, Alloxysta sp. nr victrix, Dendrocerus laticeps and Syrphophagus sp., occurred throughout the season. In addition, Asaphes suspensus and Pachynouron aphidis occurred later in the season. In greenhouses where the banker plant system of aphid control failed, the increase of secondary parasitism on banker plants was sharper than in greenhouses with successful aphid control. In March and April, the higher rates of secondary parasitism on banker plants had a significant influence on the failure of aphid control.