Effect of the form of a deposit on the activity of barban applied to Avena fatua L.

Abstract

Summary: Résumé: Zusammenfassung Experiments are described where different forms of deposit of barban were applied lo wild oats (Avena fatua L.) by varying drop size (110. 220 or 440 μm diameter) and application rate. Plants were grown in trays in a glasshouse and sprayed in the laboratory using a spinning disc in a cabinet. The results showed that the form of a deposit can have a significant effect on herbicidal activity, deposits produced with the smallest drop size being the most effective. Effect de la forme du depot sur l'activite du barbane appliqué sur Avena fatua (L.) Des expériences sont décrites au cours desquelles différentes formes de dépöts de barbane ont ete appliquées sur de la folle avoine (Avena fatua L.) en faisant varier la taille des gouttes (110, 220 ou 440 μ de diamétre) et la dose d'application. Les plantes ont été cultivées sur tablettes en serre et traitées au laboratoire en utilisant un disque tournant dans une enceinte. Les résultats obtenus ont montré que la forme du dépót pouvait avoir un effet significatif sur I'activité de I'herbicide, les dépôts formes par les gouttes les plus petites étant les plus efficaces. Einfluss der Art des Spritzbelages auf die Wirksamkeit von Barban gegenüber Avena fatua L. Es werden Versuche über die unterschiedliche Applikation von Barban auf Flughafer (Avena fatua L.) beschrieben. Variiert wurden die Tröpfchengrösse (110, 220 oder 440 μm Durchmesser) und die Aufwandmenge. Die Pflanzen wurden im Gewflchshausangezogen und mit einem ZentrifugalzcrstSuber behandelt. Die Ergebnisse zeigen, dass die Art der Applikation einen gesicherten Einfluss auf die herbizide Wirkung haben kann, wobei die Applikation mit der kleinstcn Tröpfchengrösse am wirkungsvollsten war.

Spray droplet size and carrier volume effect on dicamba and glufosinate efficacy

“…Typically, this is used as justification for the following guideline: reduced droplet sizes are necessary for contact herbicides to maximize efficacy, whereas systemic herbicide efficacy is less sensitive to changes in droplet size. Previous research demonstrated increased control across multiple herbicides and weed species as droplet size decreased to 100 µm . Glyphosate, a systemic herbicide, had greater absorption and translocation with Coarse droplets; however, this guideline was not consistent across systemic herbicides because translocation of 2,4‐D (systemic herbicide) increased as droplet size decreased, indicating that droplet size plays a role in 2,4‐D efficacy .…”

“…Previous research demonstrated increased control across multiple herbicides and weed species as droplet size decreased to 100 μm. [20][21][22][23][24] Glyphosate, a systemic herbicide, had greater absorption and translocation with Coarse droplets; 25 however, this guideline was not consistent across systemic herbicides because translocation of 2,4-D (systemic herbicide) increased as droplet size decreased, indicating that droplet size plays a role in 2,4-D efficacy. 26 Additionally, no losses in herbicide efficacy as droplet size increased were observed for several contact herbicides.…”

Loss of herbicides from ground sprayers

“…1977b), the propulsive force ofthe spray cloud (David, 1959;Hadaway & Barlow. 1965) and the size of the droplets (Brunskill, 1956;Lake & Taylor. 1974;Lake.…”

Assessment of aerial spray deposits in a spruce forest using in-flight microencapsulation technique

“…However, in many cases, their importance was due to the protected nature of the biological targets whose sheilding filtered off the larger drops (Joyce et al 1977). Even with herbicides, smaller drops have been shown (Lake and Taylor, 1974).…”