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Die Fängigkeit pheromonbeköderter Klebefallen für Speichermotten (Ephestia elutella Hbn.) in unterschiedlich dicht befallenen Getreidelägern 1
Author(s) -
Reichmuth Ch.,
Schmidt H.U.,
Levinson A. R.,
Levinson H. Z.
Publication year - 1978
Publication title -
zeitschrift für angewandte entomologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0044-2240
DOI - 10.1111/j.1439-0418.1978.tb01927.x
Subject(s) - pheromone trap , pheromone , infestation , sex pheromone , biology , horticulture , toxicology , population , zoology , mating disruption , botany , demography , sociology
Efficiency of catching adult Ephestia elutella (Hbn.) on adhesive pheromone traps in slightly and heavily infested stores Studies on the reduction of infestations with the Warehouse moth ( Ephestia elutella Hbn.) by adhesive strips with or without added (Z,E)‐9, 12‐tetradecadienyl acetate (TDA) were carried out in two large granaries. In a granary with high population density (average daily catch of 750 moths) 10 576 males, representing approx. 64 % of all captured males, were caught on 14 pheromone traps within one month. In another granary with low population density (average daily catch of 6 moths) 431 males, i.e. approx. 77 % of all captured males, were caught on 7 pheromone traps within four months. Irrespective of the pheromone dosage (3.3 or 52.4 μg TDA per capsule, 1.7 or 20 μg TDA per 100 m 3 air space) and the extent of infestation, from 61 to 70 per cent of moths were caught on all pheromone traps. In the densely infested store approx. 1.6 times more moths were captured per pheromone trap than per control trap, whereas in the slightly infested store the above trapping ratio increased to 9. If compared with controls, pheromone traps caught 1.8 or 13 times more males in the densely or slightly infested stores, respectively. Under different degrees of infestation, the ratio of male to female moths was similar on the pheromone traps (6:1), but varied on the control traps (3 or 1.4:1). The proportions of male moths caught by pheromone traps remained essentially the same after transposition of the above lures (67, 71 or 72 %). Due to trapping of large numbers of male moths in the less infested granary, the usual fumigation by phosphine could be postponed by one year. The possibility of causing insectistasis by adhesive pheromone traps was demonstrated in granaries. Zusammenfassung Untersuchungen in zwei Getreideschüttbodenlägern in Berlin (West) von Juni bis Oktober 1976 ergaben, daß unabhängig von der Pheromondosierung (1,7 μg bzw. 20 μg TDA/ 100 m 3 ) und der Befallsstärke (750 bzw. 6 täglich gefangene Ephestia elutella Hbn.) an pheromonbeköderten Klebefallen von 61 bis 70 % sämtlicher Motten gefangen wurden. Pro Pheromonfalle wurden bei dichtem Befall 1,6 und bei schwachem Befall 9mal soviel Motten gefangen wie pro unbeköderte Kontrollfalle. Bei dichtem Befall war die Anzahl der pro Pheromonfalle gefangenen Männchen 1,8‐mal und bei schwachem Befall 13mal so hoch wie die Anzahl der an den Kontrollfallen gefangenen Männchen. Das Verhältnis der Männchen und Weibchen an den Pheromonfallen war in beiden Lägern ähnlich und betrug 6:1; andererseits war es an den Kontrollfallen der verschieden stark befallenen Läger 3 bzw. 1,4:1. Auch nach Versetzen der TDA‐Köder blieb der Anteil der an den Pheromonfallen gefangenen Motten am Gesamtfang stets gleich hoch (67 %, 71 %, 72 %). Die für das eine Getreidelager in Aussicht genommene Begasung gegen Motten konnte um ein Jahr verschoben werden.

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