Abstract
The efficacy of range of compounds: three botanical insecticides (NeemAzal T/S, Trifolio S-forte and an extract of Quassia amara L.) and two pyrethroid insecticides, lambda-cyhalothrin (Karate 9.4% S.C) and deltamethrin (Decis 2.8% E.C.) were evaluated to control Rhopalosiphum padi (L.) and Metopolophium dirhodum (Wlk.). Different concentrations were used to study efficiency of the tested compounds on both aphid species 24, 48 and 72 hours post treatment in the laboratory. Bio-residual activity of these compounds was evaluated on wheat plants in the greenhouse. M. dirhodum was more susceptible than R. padi in all treatments. The mortality reached 100% after 24 h in M. dirhodum and after 48 h in R. padi. Most of the tested compounds caused acceptable levels of cereal aphid’s control. A sharp decrease in persistence of the bioactivity of tested compounds against the 4th instar of R. padi and M. dirhodum was noticed after 7 days from application. Bio-residual activity declined with days, started with more than 80% on zero time and reached 12% after 7 days in Decis, while it was 70% on zero time and reached 10% after 7 days in Karate. Decis, Karate and NeemAzal T/S are considered the most effective in controlling cereal aphids.
Zusammenfassung
Die Getreideblattläuse, Rhopalosiphum padi (L.) und Metopolophium dirhodum (Wlk.), gelten als wichtigste Schädlinge an Weizen. Die Wirksamkeit von drei botanischen Insektiziden und zwei Pyrethroid-Insektiziden wurde ausgewertet. Es wurden verschiedene Konzentrationen verwendet, um die Effizienz der getesteten Verbindungen 24, 48 und 72 Stunden nach der Behandlung im Labor zu prüfen. Die Bio-Restaktivität dieser Testsubstanzen wurde im Gewächshaus analysiert. Gegenüber allen Testsubstanzen zeigte M. dirhodum eine höhere Empfindlichkeit als R. padi. Eine Sterblichkeit von 100% erreichte M. dirhodum nach 24 Stunden, während bei R. padi eine 100% tige Mortalität nach 48 Stunden registriert wurde. Die meisten Testsubstanzen regulierten Getreideblattläuse auf akzeptablem Niveau. Die Bio-Restaktivität lag bei Decis nach 7 Tagen bei 12% und erreichte bei Karate nach 7 Tagen einen Wert von 10%. Die Ergebnisse zeigen, daß Karate, Decis und NeemAzal T/S geeignet sind, Getreideblattläuse effizient zu bekämpfen. Die Ergebnisse sollten unter Feldbedingungen evaluiert werden.
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Sallam, A.A., Volkmar, C. & El-Wakeil, N.E. Effectiveness of different bio-rational insecticides applied on wheat plants to control cereal aphids. J Plant Dis Prot 116, 283–287 (2009). https://doi.org/10.1007/BF03356325
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DOI: https://doi.org/10.1007/BF03356325