Isabel León, Juan José García, Manuel Fernández, Javier Vázquez-Piqué, Raúl Tapias. (2017). Differences in root growth of Quercus ilex and Quercus suber seedlings infected with Phytophthora cinnamomi. Silva Fennica vol. 51 no. 4 article id 6991. https://doi.org/10.14214/sf.6991

Keywords: root rot; holm oak; cork oak; infection; inoculum level; oaks decline

Highlights: Root growth of two Quercus sp. differs significantly after infection with Phytophthora cinnamomi; We observed a marked decrease in the growth of new roots in Quercus ilex with increasing inoculum level; Roots were longer but thinner with a moderate inoculum level in Quercus suber.

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In the southwest of the Iberian Peninsula, Phytophthora cinnamomi Rands is causing irreversible damage to populations of the two most common species of Quercus, the holm oak (Quercus ilex L.) and the cork oak (Quercus suber L.). Although the symptoms are similar in the two species, the mortality rates are different. We found significant differences in the post-infection growth of the root system as a function of tree species, as well as initial plant size, and inoculum level. We observed a marked decrease in the growth of new roots in Q. ilex with increasing inoculum level, while in Q. suber, we found longer but thinner roots with a moderate inoculum level. In both species, we observed a worsening in the water status of the plants from the lowest inoculum level.

León, University of Huelva, Agroforestry department, Calle Dr. Cantero Cuadrado, 6, 21004 Huelva, Spain E-mail: isabel.leon@dcaf.uhu.es
García, University of Huelva, Agroforestry department, Calle Dr. Cantero Cuadrado, 6, 21004 Huelva, Spain E-mail: juanjose.garcia@dcaf.uhu.es
Fernández, University of Huelva, Agroforestry department, Calle Dr. Cantero Cuadrado, 6, 21004 Huelva, Spain E-mail: nonoe@uhu.es
Vázquez-Piqué, University of Huelva, Agroforestry department, Calle Dr. Cantero Cuadrado, 6, 21004 Huelva, Spain E-mail: jpique@dcaf.uhu.es
Tapias, University of Huelva, Agroforestry department, Calle Dr. Cantero Cuadrado, 6, 21004 Huelva, Spain E-mail: rtapias@uhu.es

Category : Research note

article id 1305, category Research note

Israel Sánchez-Osorio, Luis Domínguez, Gloria López-Pantoja, Raúl Tapias. (2015). Antennal response of Prinobius myardi to synthetic tree volatiles. Silva Fennica vol. 49 no. 3 article id 1305. https://doi.org/10.14214/sf.1305

Keywords: Quercus; EAG; electroantennography; wood borers; Cerambycidae; plant volatiles; β-pinene

Highlights: Prinobius myardi is a wood borer considered a major threat for Mediterranean oaks, especially Quercus suber and Q. ilex; We performed electroantennographic bioassays to assess olfactory sensitivity of P. myardi to synthetic plant volatiles; P. myardi exhibits a broad sensitivity to common tree volatiles, including those emitted by oaks (α-pinene and β-pinene) or non-host volatiles (1,8-cineole).

Abstract | Full text in HTML | Full text in PDF | Author Info

Prinobius myardi Mulsant is a wood borer implicated in the decline of Mediterranean oaks, especially Quercus suber L. and Quercus ilex L. Plant volatiles play an important role in plant-insect interactions, and electroantennography (EAG) is an effective tool for exploring the electrophysiological activity of host plant volatiles on insects. To improve our understanding of the olfactory sensitivity of P. myardi, we recorded EAG responses to 20 tree volatiles, and analyzed the dose-dependent response to five doses (10^–4:1 to 1:1 v/v) of the three most EAG-active compounds. Antennae of P. myardi responded to 13 chemicals, mainly monoterpenes and green leaf volatiles, with the strongest EAG responses being observed with β-pinene, (+)-α-pinene and 1,8-cineole. Dose–response profiles showed positive dose-dependent responses for all three compounds. Our results suggest a broad sensitivity of P. myardi to common tree volatiles, particularly some host-related compounds and volatiles associated with wounded trees; the olfactory recognition of ratios of these compounds could play a role in host selection by P. myardi.

Sánchez-Osorio, Departamento de Ciencias Agroforestales, ETSI La Rábida, University of Huelva, 21819 Palos de la Frontera (Huelva), Spain http://orcid.org/0000-0002-6852-7699 E-mail: isanchez@uhu.es
Domínguez, Departamento de Ciencias Agroforestales, ETSI La Rábida, University of Huelva, 21819 Palos de la Frontera (Huelva), Spain http://orcid.org/0000-0002-0131-0057 E-mail: luis.dominguez@dcaf.uhu.es
López-Pantoja, Departamento de Ciencias Agroforestales, ETSI La Rábida, University of Huelva, 21819 Palos de la Frontera (Huelva), Spain http://orcid.org/0000-0002-2659-6127 E-mail: pantoja@uhu.es
Tapias, Departamento de Ciencias Agroforestales, ETSI La Rábida, University of Huelva, 21819 Palos de la Frontera (Huelva), Spain E-mail: rtapias@uhu.es

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