Two field experimental trials were carried out in central Italy, wherein triflusulfuron-methyl was sprayed post-emergence in sugar beet, at four different doses (from 1/1 to 1/8 of the maximum labelled dose), alone and in mixture with mineral oil (500 g ha-1). Non-linear regression analysis was used to estimate the “minimum threshold for a satisfactory efficacy” (ED90) for each weed species. Results showed that the most sensitive weeds (Sinapis arvensis L., Polygonum lapathifolium L., Daucus carota L. e Ammi majus L.) could be controlled with doses of triflusulfuron-methyl 75-80% lower than the maximum labelled rates. Mineral oil increased the efficacy of triflusulfuron-methyl against P. lapathifolium L. and volunteer colza, allowing for a rate reduction of about 80% to be achieved, with respect to triflusulfuron-methyl alone. Considering the whole plurispecific weed flora, no reduction of doses could be achieved without an unacceptable loss of weed control, due to the presence of some tolerant species, such as Chenopodium album L. and Polygonum aviculare L.. With such species, it is confirmed the need for an effective partner to triflusulfuron-methyl.
Ottimizzazione delle dosi d’impiego di triflusulfuron-methyl nella barbabietola da zucchero
PANNACCI, Euro
2000
Abstract
Two field experimental trials were carried out in central Italy, wherein triflusulfuron-methyl was sprayed post-emergence in sugar beet, at four different doses (from 1/1 to 1/8 of the maximum labelled dose), alone and in mixture with mineral oil (500 g ha-1). Non-linear regression analysis was used to estimate the “minimum threshold for a satisfactory efficacy” (ED90) for each weed species. Results showed that the most sensitive weeds (Sinapis arvensis L., Polygonum lapathifolium L., Daucus carota L. e Ammi majus L.) could be controlled with doses of triflusulfuron-methyl 75-80% lower than the maximum labelled rates. Mineral oil increased the efficacy of triflusulfuron-methyl against P. lapathifolium L. and volunteer colza, allowing for a rate reduction of about 80% to be achieved, with respect to triflusulfuron-methyl alone. Considering the whole plurispecific weed flora, no reduction of doses could be achieved without an unacceptable loss of weed control, due to the presence of some tolerant species, such as Chenopodium album L. and Polygonum aviculare L.. With such species, it is confirmed the need for an effective partner to triflusulfuron-methyl.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
