Search results for "Rhynchophorus ferrugineu"
showing 10 items of 34 documents
Members of the WRKY gene family are upregulated in Canary palms attacked by Red Palm Weevil
2018
The Red Palm Weevil (RPW), Rhynchophorus ferrugineus, is one of the major pests affecting several palm species all around the world. The aim of this work was to identify palm genes that are responsive to RPW infestations as a valuable diagnostic tool to detect the insect attack. We have analysed a total of 15 genes that were divided in two subsets: (1) 7 genes previously linked with RPW attacks, but not involved in biotic stress responses, and (2) 8 genes encoding members of the WRKY family, a class of transcription factors well-known to be linked with both abiotic and biotic stress responses. The analysis was conducted on 4-year-old Canary palms comparing uninfested plants and infested pla…
The Gut Entomotype of Red Palm Weevil Rhynchophorus ferrugineus Olivier (Coleoptera: Dryophthoridae) and Their Effect on Host Nutrition Metabolism
2017
For invasive insects, the potential roles of gut microbiota in exploiting new food resources and spreading remain elusive. Red palm weevil (RPW), Rhynchophorus ferrugineus Olivier, is an invasive destructive pest which feeds on nutrient-poor tender tissues and has caused extensive mortality of palm trees. The microbes associated with insects can improve their nutrition assimilation. However, experimental evidence on the interactions between RPW and its gut microbiota is still absent. The aim of this study is to determine the dynamics changes and the bacterial entomotype in the RPW gut and its potential physiological roles. Here, we confirmed RPW harbors a complex gut microbiota mainly const…
Exotic insect pests: The impact of the Red Palm Weevil on natural and cultural heritage in Palermo (Italy)
2013
Abstract The impact of invasive exotic pests is increasingly recognised as a global issue. A global strategy to address the exotic pest problem is beginning to evolve, albeit slowly. The International Plant Protection Convention (FAO) has begun the process of harmonizing standards for pest risk analysis to minimise the spread of exotic pests without adversely impacting global trade. However if the impacts of insect invasive species on human health and on agriculture have attracted worldwide attention, researchers and policymakers address directly the connection between invasive species and damage to natural and cultural heritages. The cost of these losses is generally neglected or underesti…
Biological activity of Bacillus spp. evaluated on eggs and larvae of red palm weevil Rhynchophorus ferrugineus
2014
This study was conducted to characterize the Bacillus populations associated with dead Rhynchophorus ferrugineus, to develop a biological control for the red palm weevil. Dead adult beetles, collected throughout Sicily, were used for isolating internal and external spore forming bacteria (SFB) microbiota. The isolates, preliminarily allotted to the Bacillaceae family, were tested at 4 concentrations (103 to 106 CFU/mL) for their ability to inhibit hatching of eggs of R. ferrugineus and were used at 106 CFU/mL to monitor their insecticidal activity against 10 day-old larvae. Total amounts of SFB measured outside the skeleton and in the inners part of the beetles were 5.59-6.94 and 5.17-7.05 …
Indagini preliminari su bacilli sporigeni associati ad adulti di Punteruolo rosso e loro possibili impieghi in lotta biologica.
2009
E’ stata condotta un’indagine per isolare batteri sporigeni associati ad adulti morti di Rhynchophorus ferrugineus. La carica microbica riscontrata, sia quella superficiale che endogena, risulta essere elevata (107 UFC/gr). Gli isolati sono riconducibili al genere Bacillus. La produzione di cristalli parasporali, potenziali δ-endotossine, è stata utilizzata come parametro fondamentale per lo screening delle colture. All’attualità su un totale di 126 isolati solo 8, presentanti elevata produzione di esostrutture, sono stati sottoposti a caratterizzazione tassonomica. Gli isolati GC33 e GC76, identificati presuntivamente come Bacillus thuringiensis, sono stati saggiati alla concentrazione di …
Lures for red palm weevil trapping systems: aggregation pheromone and synthetic kairomone
2015
[EN] BACKGROUNDThe optimisation of the lure is essential for the implementation of trapping systems to control insect pests. In this work, the response of the red palm weevil (RPW), Rhynchophorus ferrugineus Olivier, to increasing emission rates of its aggregation pheromone (ferrugineol) and the efficacy of a convenient synthetic kairomone based on fermentation odours (ethyl acetate and ethanol) have been evaluated in different years and locations along the Mediterranean basin. RESULTSIn general, although capture data and emission had noticeable variability among locations, significantly fewer RPW were captured in pyramidal Picusan (R) traps with the lowest ferrugineol emission rates tested…
Changes in the bacterial community of Canary island date palm tissues attacked by Rhynchophorus ferrugineus (Coleoptera: Curculionidae).
2009
The red palm weevil (RPW), Rhynchophorus ferrugineus is a trunk tissue borer that has recently become the major pest of palms in the Mediterranean Basin. In Sicily the red palm weevil is strongly associated with the Canary island date palm, Phoenix canariensis Hortorum ex Chabaud, an ornamental palm with high economic value. RPW larvae consumes the trunk tender soft tissues, making galleries that present a chewed appearance with a characteristic fermented odour. Several aspects of the RPW’s biology still need to be investigated such as its gut bacterial community, and the agents of fermentation processes that occur in the galleries made by the larvae. The aim of this work was to analyse the…
Analisi della comunità batterica intestinale di larve del Punteruolo Rosso.
2009
Le larve del Punteruolo rosso, Rhynchophorus ferrugineus (Oliv.) (Coleoptera: Curculionidae), hanno uno sviluppo endofita durante il quale innescano nella pianta fenomeni di marcescenza e di fermentazione. Quando questa attività coinvolge la gemma apicale, la pianta è destinata a soccombere. Studi condotti negli ultimi dieci anni hanno dimostrato che i microorganismi simbionti presenti nell’intestino degli insetti xilofagi giocano un ruolo chiave in diverse funzioni fisiologiche quali la digestione della cellulosa e dell’emicellulosa, l’acetogenesi, l’idrogenogenesi, la riduzione dei solfati e la fissazione dell’azoto (König et al, 2006; Khiyami e Alyamani 2008). Di conseguenza, lo studio d…
The culturable bacterial community of frass produced by larvae of Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae) in the Canary island …
2012
Aims: Larvae of the red palm weevil (RPW) Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae) feed inside palm stem tissues, making galleries and producing a wet fermenting frass. We characterized the culturable micro-organisms associated with frass produced by tunnelling larvae inside the Canary island date palms and investigated the role of frass and gut bacteria in plant polymers breakdown. Methods and Results: A culture-dependent method was used to isolate bacteria from frass and noninfested palm tissues. Bacterial isolates were grouped into operational taxonomic units based on polymorphisms in the ITS-PCR profiles, and representative isolates were identified by partial sequenci…
Modulation of immune responses of Rhynchophorus ferrugineus (Insecta: Coleoptera) induced by the entomopathogenic nematode Steinernema carpocapsae (N…
2014
Aim of this study was to investigate relationships between the red palm weevil (RPW) Rhynchophorus ferrugineus (Olivier) and the entomopathogenic nematode Steinernema carpocapsae (EPN); particularly, the work was focused on the immune response of the insect host in naive larvae and after infection with the EPN. Two main immunological processes have been addressed: the activity and modulation of host prophenoloxidase-phenoloxidase (proPO) system, involved in melanization of not-self and hemocytes recognition processes responsible for not-self encapsulation. Moreover, immune depressive and immune evasive strategies of the parasite have been investigated. Our results suggest that RPW possess a…