Gall size of Dryocosmus kuriphilus limits down-regulation by native parasitoids

2021 ◽  
Author(s):  
Diego Gil-Tapetado ◽  
Fernando Castedo-Dorado ◽  
José Luis Nieves-Aldrey ◽  
María J. Lombardero
Keyword(s):  
Down Regulation ◽  
Dryocosmus Kuriphilus ◽  
Native Parasitoids

scholarly journals Population Dynamics of Native Parasitoids Associated with the Asian Chestnut Gall Wasp (Dryocosmus kuriphilus) in Italy

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Tiziana Panzavolta ◽  
Francesco Croci ◽  
Matteo Bracalini ◽  
George Melika ◽  
Stefano Benedettelli ◽  
...  
Keyword(s):  
Biological Control ◽  
Population Dynamics ◽  
Pest Control ◽  
Climatic Conditions ◽  
Strong Fluctuation ◽  
Gall Wasp ◽  
Dryocosmus Kuriphilus ◽  
Native Parasitoids ◽  
Parasitism Rates ◽  
Indigenous Parasitoids

Native parasitoids may play an important role in biological control. They may either support or hinder the effectiveness of introduced nonnative parasitoids released for pest control purposes. Results of a three-year survey (2011–2013) of the Asian chestnut gall wasp (ACGW) Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae) populations and on parasitism rates by native indigenous parasitoids (a complex of chalcidoid hymenopterans) in Italian chestnut forests are given. Changes in D. kuriphilus gall size and phenology were observed through the three years of study. A total of 13 species of native parasitoids were recorded, accounting for fluctuating parasitism rates. This variability in parasitism rates over the three years was mainly due to the effect of Torymus flavipes (Walker) (Hymenoptera: Torymidae), which in 2011 accounted for 75% of all parasitoid specimens yet decreased drastically in the following years. This strong fluctuation may be related to climatic conditions. Besides, our data verified that parasitoids do not choose host galls based on their size, though when they do parasitize smaller ones, they exploit them better. Consequently, ACGWs have higher chances of surviving parasitism if they are inside larger galls.

Recruitment of native parasitoids by an introduced gall wasp Dryocosmus kuriphilus Yasumatsu, 1951 (Hymenoptera: Cynipidae) in Britain and France

2020 ◽  
Vol 156 (2) ◽  
pp. 111-116
Author(s):  
M.T. Jennings ◽  
R.R. Askew
Keyword(s):  
Native Species ◽  
Biological Control Agent ◽  
Control Agent ◽  
Pest Species ◽  
Gall Wasp ◽  
Dryocosmus Kuriphilus ◽  
Native Parasitoids ◽  
Torymus Sinensis ◽  
Gall Wasps ◽  
Major Pest

The invasive chestnut gall wasp Dryocosmus kuriphilus Yasumatsu (Hymenoptera: Cynipidae) is a major pest species of Castanea spp. worldwide. It only arrived in Britain in 2015 and the parasitoid community associated with it was studied in 2019. Eight native species of chalcidoid, previously known to be associated with oak gall wasps, were identified. These results are compared to a similar study (2016–2019) in France where four parasitoids were reared. However, this community included the deliberately introduced Torymus sinensis Kamijo, a specific biological control agent of D. kuriphilus. The presence of T. sinensis and the differences between the two communities is discussed.

The invasive ACGW Dryocosmus kuriphilus (Hymenoptera: Cynipidae) in Spain: native parasitoid recruitment and association with oak gall inducers in Catalonia

2019 ◽  
Vol 93 (1) ◽  
pp. 178-186 ◽  
Author(s):  
Juan Luis Jara-Chiquito ◽  
Richard R Askew ◽  
Juli Pujade-Villar
Keyword(s):  
First Record ◽  
Abundant Species ◽  
Invasive Pest ◽  
Gall Wasp ◽  
Dryocosmus Kuriphilus ◽  
Native Parasitoids ◽  
Torymus Sinensis ◽  
Gall Inducer

Abstract The Asian chestnut gall wasp (ACGW), Dryocosmus kuriphilus (Hymenoptera: Cynipidae), is an invasive pest that affects chestnut trees. The first record of this pest in Spain was in 2012, in Catalonia, and it is now distributed in virtually every chestnut growing area in the country. In this study, we present an overview of parasitoid recruitment by ACGW in Catalonia over a 4-year period (2013–2016) comparing parasitoid communities attacking galls on oak and chestnut trees at the same sites. A total of 22 species of native parasitoids that normally attack oak cynipids emerged from ACGW galls, together with the non-native Torymus sinensis. The most abundant species were Bootanomyia dorsalis, Torymus flavipes, Ormyrus pomaceus and Eupelmus urozonus. The study also found that 20 of the 22 native parasitoids in ACGW galls were also reared from galls of 13 species of oak gall inducer (12 Cynipidae, 1 Cecidomyiidae).

scholarly journals The open bar is closed: restructuration of a native parasitoid community following successful control of an invasive pest

2019 ◽  
Author(s):  
David Muru ◽  
Nicolas Borowiec ◽  
Marcel Thaon ◽  
Nicolas Ris ◽  
Madalina I. Viciriuc ◽  
...  
Keyword(s):  
Biological Control ◽  
Habitat Type ◽  
Invasive Pest ◽  
Parasitoid Species ◽  
Native Community ◽  
Natural Habitats ◽  
Gall Wasp ◽  
Dryocosmus Kuriphilus ◽  
Native Parasitoids ◽  
Torymus Sinensis

AbstractThe rise of the Asian chestnut gall wasp Dryocosmus kuriphilus in France has benefited the native community of parasitoids originally associated with oak gall wasps by becoming an additional trophic subsidy and therefore perturbing population dynamics of local parasitoids. However, the successful biological control of this pest has then led to significant decreases in its population densities. Here we investigate how the invasion of the Asian chestnut gall wasp Dryocosmus kuriphilus in France and its subsequent control by the exotic parasitoid Torymus sinensis has impacted the local community of native parasitoids.We explored 5 years of native community dynamics within 26 locations during the rise and fall of the invasive pest. In an attempt to understand how mechanisms such as local extinction or competition come into play, we analyzed how the patterns of co-occurrence between the different native parasitoid species changed through time.Our results demonstrate that native parasitoid communities experienced increased competition as the D. kuriphilus levels of infestation decreased. During the last year of the survey, two alternative patterns were observed depending on the sampled location: either native parasitoid communities were represented by an extremely limited number of species occurring at low densities, in some cases no native parasitoid species at all, or they were dominated by one main parasitoid: Mesopolobus sericeus. These two patterns seemed to correlate with the habitat type, M. sericeus being more abundant in semi-natural habitats compared to agricultural lands, the former known to be natural reservoirs for native parasitoids. These results highlight how the “boom-and-bust” dynamics of an invasive pest followed by successful biological control can deeply alter the structure of native communities of natural enemies.This article has been peer-reviewed and recommended by Peer Community in Zoologyhttps://doi.org/10.24072/pci.zool.100004

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