Einfluß des Applikationsortes auf die Penetration und Translokation von Diclofop-methyl bei Flughafer (Avena fatua L.)

Effect of the type of application on the penetration and translocation of dictofop-methyl in wild oats (Avena fatua L.) An investigation was curried out with wild oats on the effect of different types of application between the apex and the base of the shoot on the penetration and translocation of ¹⁴C-diclofopmethyl Penetration at the base of the leaf blade is 64% higher in the first leaf and 95% higher in the second than at the lip of the respective leaves Basipetal translocation of ¹⁴C-diclofop-methyl is limited so the nearer to the base of the shoot the herbicide application is made, the higher will be the amount of ¹⁴C-diclofop-methyl at the shoot base which is the principle site of activity Application at the base of the leaf blade gave the optimum distribution of ¹⁴C-diclofop-methyl in the plant. One reason for this is that, with this type of application, the herbicide solution runs down into the leaf sheath giving rise mechanically to basipetal penetration within the sheath into the zone of meristematic tissue at the base of the shoot. These findings lead to a demand for the most accurate possible placing of diclofop-methyl in the zone of the base of the shoots.