Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

jeudi 12 janvier 2012

Egg exposure to pyriproxyfen in the tomato leaf miner Tuta absoluta: ovicidal activity or behavioural-modulated hatching mortality?

Keywords:

Egg mortality;
insect growth regulator;
insecticidal activity;
JH mimic;
pest control;
tomato borer;
tomato pinworm

Abstract

Insecticide susceptibility varies with the insect life stage and although the egg stage is sometimes perceived as the most vulnerable, it is a difficult target for insecticide application and little studied as such. Egg susceptibility to insecticides is generally considered important for insect growth regulators and insect pests of reduced mobility like leaf miners because of their placement on the host plant part targeted by the insecticidal application. The egg exposure to the juvenile hormone mimic pyriproxyfen was studied here in the tomato leaf miner Tuta absoluta (Lepidoptera: Gelechiidae), a key tomato insect pest, aiming to assess if mortality is achieved due to insecticide ovicidal activity or due to behavioural impairment of the larvae preventing egg hatching. Survival analysis of treated tomato leaves and/or eggs indicated the importance of egg exposure to pyriproxyfen leading to a significant decrease in survival with a nearly 50% reduction in survival time, which peaked at the first instar. Ovicidal activity of pyriproxyfen in the tomato leaf miner was negligible, but image recording and behaviour analysis indicated behavioural impairment of larval activity compromising hatching and leaf mining by early instar larvae leading to high mortality at this stage (ca 50%). The likely causes and management implications of such findings are discussed.

Lire l'article complet @ : http://onlinelibrary.wiley.com/doi/10.1111/j.1744-7348.2011.00518.x/full

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lundi 26 décembre 2011

Ethiopia: Tuta absoluta is extending its damage to the potato tuber

Key Potato production areas in Sudan and Ethiopia are close to each other along the Blue Nile and its tributaries. The recent expansion of the Tuta absoluta in the areas south of Wadi Medni in Sudan, is pausing a serious risk across the board to the potato production areas around the upper Blue Nile in Ethiopia. Tuta absoluta has been a serious threat to Tomato production damaging both leaf as well as fruit and if went unchecked it can devastate up to 100% of the drop. Up until recently the damage to potato crop was limited mainly to the leaf part of the plant. However, during the expansion of Tuta absoluta into Sudan, the pest seems to have extended its reach to the potato Tuber as well.

Due to its nutritional value and its export potential, currently there are serious efforts, sponsored by many international agencies, to enhance the production of potato in East Africa for the purpose of providing sustainable staple food source in the region as we well as improving farmer’s earnings. The new pest can present a serious threat to such efforts and needs to be kept in check as early as possible. During the past three years and while expanding eastward from Spain along the North African coast, Tuta absoluta have caused havoc in agricultural production , devastating crops in all countries on the way, elevating prices beyond the capability of average consumer. International aid and development agencies are strongly urged to start early monitoring provide education material to the farmers to identify the risk and plan to act against the pest and limit its damage. Pheromone traps are simple and effective tool to alert farmers to the incoming risk.

Russell IPM is offering a limited quantity of free monitoring kits to Aid and development teams advising and supporting farmers in Blue Nile region of Ethiopia to help identifying any outbreak as early as possible and to take the appropriate measures against it. This offer is also extended to agricultural institutes active in this field. Enquires for this offer as well as any educational resources regarding Tuta absoluta, please contact Dr Shakir Al-Zaidi directly.
Tuta absoluta is a serious invasive pest. After devastating tomato production in South America, it was introduced accidently to Spain in 2006. Since then it has spread rapidly to main tomato production in Spain and the rest of the Mediterranean region and beyond. The problems associated with this pest are the rapid population multiplication (up to 12 generations in one year) as well as its ability to develop resistance toward synthetic insecticides within few generations.

Source : http://www.freshplaza.com/news_detail.asp?id=90806
Source: teatronaturale.com

Publication date: 12/20/2011

Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

vendredi 30 novembre 2012

Report of the EPPO/FAO/IOBC/NEPPO Joint International Symposium on management of Tuta absoluta (tomato borer) V. Zlof, M. Suffert Article first published online: 7 AUG 2012 DOI: 10.1111/epp.2555

Original Articles : http://onlinelibrary.wiley.com/doi/10.1111/epp.2012.42.issue-2/issuetoc

Répartition de Tuta absoluta dans le Monde

mardi 17 janvier 2012

Tuta absoluta - The Tomato Leafminer or Tomato Borer Recommendations for Sustainable and Effective Resistance Management

Tuta absoluta - IRAC Susceptibility Test Method No. 022