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Tiller counting or total plot harvest — how exact are predator counts in winter wheat?

Content Provider	Springer Nature Link
Author	Möwes, Maureen Freier, B. Kreuter, Th. Triltsch, H.
Copyright Year	1997
Abstract	Methodical investigations on predator recording in winter wheat were performed at 3 sites in Middle Germany (Flaeming, Magdeburger Boerde, Middle German dry region near Halle/S.) in 1994 to 1996. In 13 field studies tiller counts (5× 6 m drill row with corresponding soil surface) were compared with the total plot harvest (an „absolute method”, combination of D-VAC suction sampling and vegetation harvest within a 1 m2-cage, laboratory determination of arthropods).The U-test analysis of each survey according toMann andWhitney shows only 8 significant differences in 55 comparisons. There were no clear trends. Considering the average predator densities in 13 investigations, the following relative densities (and significances using t-test) were calculated for field counts in comparison with the total plot harvest: coccinellid adults −0.88 (P>0.10), coccinellid larvae −0.88 (P>0.10), syrphid larvae −0.92 (P>0.10), chrysopid larvae −0.84 (P>0.10), adult carabids −0.24 (P=0.054), adult staphylinids −0.14 (P=0.002) and adult spiders −0.48 (P=0.058). The important underestimation of polyphagous predatory arthropods in field counts is discussed.In den Jahren 1994 bis 1996 erfolgten an 3 Standorten (Mitteldeutsches Trockengebiet bei Halle/S., Fläming und Magdeburger Börde) methodische Untersuchungen zur Dichteerfassung von Prädatoren in Winterweizen.In insgesamt 13 Erhebungen wurden jeweils 5 Feldbonituren (6 m laufende Drillreihe und dazugehöriger Bodenbereich) mit einer „absoluten” Methode, der Parzellentotalernte (D-VAC-Absaugung und Pflanzenentnahme innerhalb eines 1 m2-Käfigs, Auswertung der Arthropoden im Labor) verglichen. Die Analyse der einzelnen Erhebungen mittels U-Test nachMann undWhitney ergab für nur 8 der 55 Vergleiche signifikante Unterschiede. Es zeigten sich keine klaren Trends.Bei Betrachtung der mittleren Dichte der Nützlinge auf der Grundlage der Dichten in den 13 Erhebungen stellten sich für die Boniturren im Vergleich zu den Parzellentotalernten folgende relative Abundanzen und Signifikanzen im t-Test heraus:Coccinellidenimagines 0,88 (P>0,10), Coccinellidenlarven 0,88 (P>0,10), Syrphidenlarven 0,92 (P>0,10), Chrysopidenlarven 0,84 (P>0,10), Carabidenimagines 0,24 (P=0,054), Staphylinidenimagines 0,14 (P=0,002), adulte Spinnen 0.48 (P=0,058). Die beachtliche Unterschätzung der polyphagen Raubarthropoden in den Boninturen wird diskutiert.
Starting Page	121
Ending Page	126
Page Count	6
File Format	PDF
ISSN	03407330
Journal	Journal of Pest Science
Volume Number	70
Issue Number	7
e-ISSN	16124766
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agriculture Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Environmental Science Agricultural and Biological Sciences

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