The red palm weevil (RPW), Rhynchophorus ferrugineus (Olivier), is a highly prevalent pest worldwide damaging more than 18 different species of palm trees. Developed in Italy in 2004, RPW has begun attacking ornamental palm trees belonging to the species Phoenix canariensis (Chabaud) and Phoenix dactylifera L., causing serious damage in numerous regions of Italy. Because of the restrictions on pesticide use, numerous alternatives are being investigated employing products such as entomopathogenic nematodes (EPNs). Four Heterorhabditis and seven Steinernema species and isolates belonging to the collection of EPNs at the section of Entomology and Zoology of the DiBCA, University of Bari, Italy, were assayed for their pathogenicity against the larvae and adults of R. ferrugineus and compared with the commercial products NEMATOP [Heterorhabditis bacteriophora Poinar] and NEMASTAR [Steinernema carpocapsae (Weiser)]. After ten days of testing, the EPNs that yielded the highest larval mortality were H. bacteriophora ALG12, CS17 and C3, NEMATOP (93-100%), Steinernema longicaudum Shen et Wang (100%), Steinernema glaseri (Steiner) (100%), S. carpocapsae NEMASTAR (100%) and Steinernema kraussei (Steiner) 3D (100%). Compared to the adults, H. bacteriophora C3 (100%) and CS17 (80%), S. longicaudum (96%), and S. carpocapsae MR7 (80%) resulted as being the most effective EPNs. Concerning the ability for Steinernema and Heterorhabditis species to reproduce in R. ferrugineus, one may conclude that commercial product derived from S. carpocapsae, as well as the autochthonous isolate, did not produce nematode offspring in the adult weevil and its larvae. On the contrary, H. bacteriophora produced adults and new generations but only in Rhynchophorus adults. However, S. glaseri yielded a slower reproduction rate in both the larvae and adults of Rhynchophorus. The same result was obtained for S. affine (Bovien), which in some cases was able to produce new generations in adult insects.
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|Titolo:||Evaluation of the effects of autochthonous and commercial isolates of Steinernematidae and Heterorhabditidae on Rhynchophorus ferrugineus.|
|Data di pubblicazione:||2011|
|Appare nelle tipologie:||1.1 Articolo in rivista|