FEATURED INFORMATION

Integrated control of the pear psylla Cacopsylla pyri

Herman Helsen

Applied Plant Research, Wageningen UR, P. o. Box 200, 6670 AE Zetten, Països Baixos

Pear psylla (mainly Cacopsylla pyri) is the main arthropod pest in European pear orchards. This phloem feeder has multiple generations per year, a large reproductive capacity, and it readily develops resistance to pesticides.
Integrated control strategies aim at keeping the psylla populations at an acceptable low level throughout the year.
Many factors may regulate pear psylla to some extent. However, sufficient control is achieved only with the presence of a range of natural enemies, combined with cultural control measures and an intelligent use of selective pesticides. Obviously, each of the control measures has its costs. For example, (i) low tree vigour reduces psylla infestation, but a certain tree growth level is essential to obtain a good crop load and fruit quality; (ii) earwigs (Forficula auricularia) are important generalist predators, but at high densities this predator may damage the fruits, and become a pest itself; (iii) hedgerows around the orchard are a source of the specialist predator Anthocoris nemoralis, but also give shelter to birds that may damage the fruits short before harvest; and(iv) modern selective control techniques save natural enemies, but are more expensive than the classical broad spectrum pesticides.
It is challenging to find a balance between these costs and benefits. This can only be achieved with a thorough knowledge of the impact of the individual factors and the interactions between these factors in the orchard ecosystem. Design, testing and implementation of such an integrated control strategy require a close cooperation between researchers, extension workers and growers.

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In accordance with the Organic Law on the Protection of Personal Data 15/1999, of 13 December, Promotora de Exportaciones Catalanas SA (hereinafter PRODECA), whose address is Gran Via de les Corts Catalanes, 620, principal, 08007 Barcelona, with tax reg. no. NIF A58241316, declares that the images contained on the website www.smartfruitcongress.cat are included in a file belonging to PRODECA. The purpose of this file is the promotion, via its website, of the activities conducted by PRODECA – SmartfFruit IPM International Congress.

PRODECA guarantees that you may, at any time, exercise your right to access, rectify, cancel or oppose by writing to the aforesaid postal address, using the reference "PROTECCIÓN DE DATOS - SMARTFRUIT", or to the email address smartfruitcongress@smartfruitcongress.cat.

Specifically, to correctly exercise these rights you must clearly provide the following items in that communication:
- Name, surname(s) and photocopy of National Identity Document or Passport.
- Statement of the purpose of the request.
- Address for notification purposes.
PRODECA also declares that it reserves the right to delete from its website any content that it considers violates current and applicable legislation.

D’acord amb l’article 17.1 de la Llei 19/2014, la ©Generalitat de Catalunya permet la reutilització dels continguts i de les dades sempre que se'n citi la font i la data d'actualització i que no es desnaturalitzi la informació (article 8 de la Llei 37/2007) i també que no es contradigui amb una llicència específica.