Suchergebnisse

Entomopathogenic nematodes (EPN) are excellent biocontrol agents against various insect pests. Novel biotechnological approaches can enhance their utility against insects above-ground, opening a new venue for selecting superior EPN against certain insects. We hypothesize that different populations of the same species but from different origins (habitat, ecoregion) will differ in their virulence. This study aimed to evaluate the virulence of various EPN populations against two pests of worldwide incidence and damage to high value crops: Frankliniella occidentalis (Thysanoptera: Thripidae) and Tuta absoluta (Lepidoptera: Gelechiidae). We tested 10 EPN populations belonging to three EPN species: Heterorhabditis bacteriophora (Koppert, MG-618b, AM-203, RM-102), Steinernema feltiae (Koppert, RS-5, AM-25, RM-107), and Steinernema carpocapsae (Koppert, MG-596a). Each EPN population was tested at two concentrations. Frankliniella occidentalis was tested at 160 and 80 IJs/cm2 and T. absoluta at 21 and 4 IJs/cm2. Control treatments followed the same experimental procedure but only adding distilled water. Overall, whenever different, higher IJs concentration resulted in lower adult emergence, higher larval mortality, and shorter time to kill the insects. Considering the low concentration, S. feltiae provided the best results for both insects and instars investigated, while H. bacteriophora and S. carpocapsae required a high concentration to reach similar or slightly better results. Differences among populations of each of the species were detected, but only the native populations of H. bacteriophora populations showed consistently higher control values against both insects/instar compared with the commercial one. Differences among S. feltiae and S. carpocapsae populations depended on the IJs concentration, insect, and instar. We consider S. feltiae a very promising species for their application against F. occidentalis and T. absoluta, with the Koppert population as the most consistent among the populations tested. Specific EPN-populations of S. carpocapsae and H. bacteriophora were good candidates against certain instar/insects at high concentrations. This study emphasized the importance of intraspecific variability for EPN virulence. ; RCH is awarded by Ramon y Cajal contract award MCIN/AEI/10.13039/501100011033 and by "ESF Investing in your future": Grant RYC-2016-19939 from the Government of Spain. IVD is supported with a FPI-UR (2021) fellowship (Universidad de La Rioja, Spain). MC is supported by a Moroccan scholarship for the Ministry of National Education, Vocational Training, Higher Education and Scientific Research, and the travel assistance associated with the grant CSIC I-COOP + 2018 grant (COOPA20231). MMGT is funded by the Program JAE-Intro CSIC call 2020 (JAEINT20_EX_0939). MP and DL are funded by an introduction to research fellowship from Government of La Rioja (CAR 2020). The study was performed under the Research and Innovation grant at CSIC ref. 20200154 and 20194898.

"Thrips tabaci Lindeman (Thysanoptera: Thripidae), commonly known as onion thrips, is a serious global pest of commercial onion, causing direct and indirect important damages. This survey carried out in natural areas of Biskra province (Algeria) during two periods, 2008/2009 and 2011/2012, aims to review the plant species harbouring T. tabaci in this region. Algerian and Spanish researchers confirmed twenty-three thrips species. T. tabaci is the most abundant and polyphagous. Studies have indicated that it settled in fifty one plant species belonging to nineteen botanical families. The most important are Asteraceae, Brassicaceae, Fabaceae, and Amaranthaceae. In Biskra, T. tabaci was found in sites between -32 m and 1000 m of sea level. The results also indicate the presence of sexual and asexual populations. This study shows that T. tabaci is ubiquitous in the natural habitat of Biskra province. Further research is needed to confirm its host plants and the most common mode of reproduction in this region by studying the largest number of plants in various environments and demonstrating the sex ratio over a broad survey spectrum."

The Panel on Plant Health performed a pest categorisation of the South African citrus thrips, Scirtothrips aurantii Faure (Thysanoptera: Thripidae), for the European Union (EU). This is a well‐defined and distinguishable species, recognised as a pest of citrus and mangoes in South Africa, which has been cited on more than 70 different plants, including woody and herbaceous species. It feeds exclusively on young actively growing foliage and fruit. S. aurantii is not known to occur in the EU and is listed in Annex IIAI of 2000/29/EC as a harmful organism presenting a risk to EU plant health. The international trade of hosts as either plants for planting or cut flowers provide potential pathways into the EU. However, current EU legislation prohibits the import of citrus plants. Furthermore, measures aimed at the import of plants for planting in a dormant stage (no young foliage or fruits present) with no soil/growing medium attached, decreases the likelihood of the pest entry with such plants. Interceptions have occurred on Eustoma grandiflorum cut flowers. Considering climatic similarities between some of the countries where S. aurantii occurs (South Africa, Australia) and the EU, its thermal biology and host distribution in the EU, S. aurantii has the potential to establish, especially in citrus‐growing regions of the EU. S. aurantii would most probably breed all year long around the Mediterranean and could cause crop losses in citrus, especially oranges. Phytosanitary measures are available to inhibit the introduction of S. aurantii. Considering the criteria within the remit of EFSA to assess its status as a potential Union quarantine pest (QP) or as a potential regulated non‐quarantine pest (RNQP), S. aurantii meets with no uncertainties the criteria assessed by EFSA for consideration as a potential Union QP.

The Panel on Plant Health performed a pest categorisation of the South African citrus thrips, Scirtothrips aurantii Faure (Thysanoptera: Thripidae), for the European Union (EU). This is a well-de fi ned and distinguishable species, recognised as a pest of citrus and mangoes in South Africa, which has been cited on more than 70 different plants, including woody and herbaceous species. It feeds exclusively on young actively growing foliage and fruit. S. aurantii is not known to occur in the EU and is listed in Annex IIAI of 2000/29/EC as a harmful organism presenting a risk to EU plant health. The international trade of hosts as either plants for planting or cut fl owers provide potential pathways into the EU. However, current EU legislation prohibits the import of citrus plants. Furthermore, measures aimed at the import of plants for planting in a dormant stage (no young foliage or fruits present) with no soil/growing medium attached, decreases the likelihood of the pest entry with such plants. Interceptions have occurred on Eustoma grandi fl orum cut fl owers. Considering climatic similarities between some of the countries where S. aurantii occurs (South Africa, Australia) and the EU, its thermal biology and host distribution in the EU, S. aurantii has the potential to establish, especially in citrus-growing regions of the EU. S. aurantii would most probably breed all year long around the Mediterranean and could cause crop losses in citrus, especially oranges. Phytosanitary measures are available to inhibit the introduction of S. aurantii . Considering the criteria within the remit of EFSA to assess its status as a potential Union quarantine pest (QP) or as a potential regulated non-quarantine pest (RNQP), S. aurantii meets with no uncertainties the criteria assessed by EFSA for consideration as a potential Union QP

En Sinaloa la producción de hortalizas y cucurbitáceas es una de las actividades agrícolas más importantes, por lo que cada año se usa un gran volumen de insecticidas químicos para el control de las plagas que atacan a estos cultivos. En el presente trabajo se dan a conocer a las principales plagas en la región, haciendo también un análisis sobre los insecticidas biorracionales que se utilizan para el control efectivo de las mismas. Se encontró que para el combate de Bemisia argentifolii Bellows & Perring (Hemiptera: Aleyrodidae) se utiliza el aceite de Neem al 0.2%., para ninfas de Bactericera cockerelli Sulc. (Homoptera: Psyllidae) guanábana Annona muricata L. (Annonales: Annonaceae) a dosis de 2500-5000 mg/L., para Liriomyza trifolii Burgess (Diptera: Agromyzidae) semillas de neem al 2%., y para Myzus persicae Sulzer (Hemiptera: Aphididae), aceite de colza a dosis de 920g/L (2% v/v)., para Frankliniella occidentalis Pergande (Thysanoptera: Thripidae) spinosad (conserve®) a 48-60 mg/L., para Phthorimaea operculella Zeller (Lepidóptera: Gelechiidae) el virus de la granulosis (105 CO/mL) combinado con neem (aceite emulsificable DalNeemTM y NeemAzalTM-T/S a dosis de 8 mg/L, cada uno). El uso de estos productos y las dosis dependen del tipo de plaga y del cultivo. En general estos productos causan mortalidades de insectos superiores al 95%, además de que tienen baja toxicidad sobre enemigos naturales, por lo que pueden usarse de manera individual o en combinación, en esquemas de control integrado de plagas de hortalizas e insectos vectores de enfermedades en el Norte de Sinaloa.

The EFSA Panel on Plant Health (PLH) performed a pest categorisation of Thrips palmi (Thysanoptera: Thripidae), for the EU. T. palmi is listed in Annex IAI of 2000/29 EC. Using molecular methods, cryptic speciation has been shown although no new species from the group have been formally described. Here, we consider T. palmi sensu lato as a defined species native to southern Asia, which has spread to tropical and subtropical countries in Asia, the Pacific, North, Central and South America, Africa and Australia. T. palmi has been reported from many different hosts in 20 botanical families; Cucurbitaceae, Solanaceae and Orchidaceae are of primary importance. T. palmi has been intercepted many times on plants from these families. Wild and cultivated hosts are widespread in the EU. However, as a subtropical and tropical species, only a small area of the EU provides climatic conditions where establishment may be possible outdoors. Several host plants are cultivated in glasshouses where conditions may be more favourable for establishment in year-round crops. There have been past outbreaks of T. palmi in EU glasshouses and outdoors in Portugal. T. palmi causes feeding and oviposition damage and populations in Asia are competent vectors of tospoviruses. Impacts could occur on many hosts, especially Cucurbitaceae, Solanaceae and ornamental plants particularly in glasshouses. Phytosanitary measures aim to prevent the entry of T. palmi specifically on cut flowers of Orchidaceae and fruits of Momordica and Solanum melongena. The species meets all the criteria assessed by the PLH Panel to satisfy the definition of a Union quarantine pest, while it does not satisfy all the criteria for it to be regarded as a Union regulated non-quarantine pest (RNQP)

The EFSA Panel on Plant Health (PLH) performed a pest categorisation of Thrips palmi (Thysanoptera: Thripidae), for the EU. T. palmi is listed in Annex IAI of 2000/29 EC. Using molecular methods, cryptic speciation has been shown although no new species from the group have been formally described. Here, we consider T. palmi sensu lato as a defined species native to southern Asia, which has spread to tropical and subtropical countries in Asia, the Pacific, North, Central and South America, Africa and Australia. T. palmi has been reported from many different hosts in 20 botanical families; Cucurbitaceae, Solanaceae and Orchidaceae are of primary importance. T. palmi has been intercepted many times on plants from these families. Wild and cultivated hosts are widespread in the EU. However, as a subtropical and tropical species, only a small area of the EU provides climatic conditions where establishment may be possible outdoors. Several host plants are cultivated in glasshouses where conditions may be more favourable for establishment in year-round crops. There have been past outbreaks of T. palmi in EU glasshouses and outdoors in Portugal. T. palmi causes feeding and oviposition damage and populations in Asia are competent vectors of tospoviruses. Impacts could occur on many hosts, especially Cucurbitaceae, Solanaceae and ornamental plants particularly in glasshouses. Phytosanitary measures aim to prevent the entry of T. palmi specifically on cut flowers of Orchidaceae and fruits of Momordica and Solanum melongena. The species meets all the criteria assessed by the PLH Panel to satisfy the definition of a Union quarantine pest, while it does not satisfy all the criteria for it to be regarded as a Union regulated non-quarantine pest (RNQP). (C) 2019 European Food Safety Authority. EFSA Journal published by John Wiley and Sons Ltd on behalf of European Food Safety Authority.

The Panel on Plant Health performed a pest categorisation of the citrus thrips, Scirtothrips citri (Moulton) (Thysanoptera: Thripidae), for the European Union (EU). This is a well‐defined and distinguishable species, occurring in North America and Asia. Its precise distribution in Asia is uncertain. S. citri is a pest of citrus and blueberries and has been cited on over 50 different host species in 33 plant families. Whether all plants reported as hosts are true hosts, allowing population development of S. citri, is uncertain. S. citri feeds exclusively on young actively growing foliage and fruit. It is not known to occur in the EU and is listed in Annex IIAI of 2000/29/EC as a harmful organism. The international trade of hosts, as either plants for planting or cut flowers, provide potential pathways into the EU. However, current EU legislation prohibits the import of citrus plants for planting. Furthermore, measures aimed at the import of plants for planting in a dormant stage (no young foliage or fruits present) with no soil/growing medium attached, decreases the likelihood of the pest's entry via other hosts. Considering that there are regional climatic similarities where S. citri occurs in the USA with climates in the EU, and taking EU host distribution into account, S. citri has the potential to establish in the EU, especially in citrus and blueberry growing regions around the Mediterranean where quality losses in citrus and yield losses in blueberry could occur. Phytosanitary measures are available to inhibit the likelihood of introduction of S. citri from infested countries. Considering the criteria within the remit of EFSA to assess its status as a potential Union quarantine pest (QP) or as a potential regulated non‐quarantine pest (RNQP), S. citri meets with no uncertainties the criteria assessed by EFSA for consideration as a potential Union QP.

The Panel on Plant Health performed a pest categorisation of the South African citrus thrips, Scirtothrips aurantii Faure (Thysanoptera: Thripidae), for the European Union (EU). This is a well‐defined and distinguishable species, recognised as a pest of citrus and mangoes in South Africa, which has been cited on more than 70 different plants, including woody and herbaceous species. It feeds exclusively on young actively growing foliage and fruit. S. aurantii is not known to occur in the EU and is listed in Annex IIAI of 2000/29/EC as a harmful organism presenting a risk to EU plant health. The international trade of hosts as either plants for planting or cut flowers provide potential pathways into the EU. However, current EU legislation prohibits the import of citrus plants. Furthermore, measures aimed at the import of plants for planting in a dormant stage (no young foliage or fruits present) with no soil/growing medium attached, decreases the likelihood of the pest entry with such plants. Interceptions have occurred on Eustoma grandiflorum cut flowers. Considering climatic similarities between some of the countries where S. aurantii occurs (South Africa, Australia) and the EU, its thermal biology and host distribution in the EU, S. aurantii has the potential to establish, especially in citrus‐growing regions of the EU. S. aurantii would most probably breed all year long around the Mediterranean and could cause crop losses in citrus, especially oranges. Phytosanitary measures are available to inhibit the introduction of S. aurantii. Considering the criteria within the remit of EFSA to assess its status as a potential Union quarantine pest (QP) or as a potential regulated non‐quarantine pest (RNQP), S. aurantii meets with no uncertainties the criteria assessed by EFSA for consideration as a potential Union QP.