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Effects of Different Neem Formulations on the Twospotted Spider Mite, Tetranychus urticae Koch, on Tomato (Lycopersicon esculentum Mill.)

  • Markus KnappEmail author
  • Sophia Shaban Kashenge
Research Article

Abstract

The effects of four different neem formulations (Neemros®, Neemroc EC®, Neemroc Combi and Saroneem) and a combination of Neemros® with a synthetic acaricide (Mitac®) on the twospotted spider mite (Tetranychus urticae Koch) were compared with Mitac® on tomato (Lycopersicon esculentum Mill.) leaf discs in the laboratory. The following LC50 were determined: Neemroc EC® 12.9 ml/l, Saroneem 5.8 ml/l, Neemroc Combi 1.0 ml/l and Mitac® + Neemros® 1 ml/l + 17.6 g/l. No LC50 was determined for Neemros® since the highest mortality observed was 11.4 %. The combination of Mitac® and Neemros® resulted in the highest mortality after 24 hours (83.3 %), followed by Neemroc EC® (78.3 %), Saroneem (53.4 %), Mitac® (50.8 %), Neemroc Combi (38.9 %), the control (4.5 %) and Neemros® (0.0 %). All neem formulations also caused repellence and oviposition deterrence in T. urticae.

Key Words

twospotted spider mite Tetranychus urticae tomato Lycopersicon esculentum neem Azadirachta indica repellence oviposition deterrence 

Résumé

L’effet de quatre formulations à base d’extrait de ‘neem’ (Neemros®, Neemroc EC®, Neemroc Combi et Saroneem) et d’un mélange de Neemros® avec un acaricide synthétique (Mitac®) a été comparé avec celui du Mitac® sur l’acarien vert (Tetranychus urticae Koch) en utilisant des disques foliaires de tomate (Lycopersicon esculentum Mill.) au laboratoire. Les DL50 suivantes ont été obtenues: 12.9 ml/l pour Neemroc EC®, 5.8 ml/l pour Saroneem, 1.0 ml/l pour Neemroc Combi et 1 ml/l + 17.6 g/1 pour Mitac® + Neemros®. Aucune valeur de DL50 n’a pu être calculée pour le Neemros® car la plus forte mortalité enregistrée n’était que de 11.4%. Le Mitac® mélangé au Neemros a induit la plus forte mortalité (de 83.3%) après 24 heures, suivi du Neemroc EC® (de 78.3%), du Saroneem (de 53.4%), du Mitac® (de 50.8%), du Neemroc Combi (de 38.9%), du control (de 4.5%) et du Neemros® (de 0.0%). Toutes les formulations à base de ‘neem’ se sont également avérées acarofuges et dissuasives à l’oviposition pour T. urticae.

Mots Clés

acarien vert Tetranychus urticae tomate Lycopersicon esculentum ‘neem’ Azadirachta indica acarofuge dissuasif à l’oviposition 

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Copyright information

© ICIPE 2003

Authors and Affiliations

  1. 1.International Centre of Insect Physiology and Ecology (ICIPE)NairobiKenya
  2. 2.Sokoine University of AgricultureMorogoroTanzania

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