Comparative Tolerance of Some Dicotyledons to Chlorpropham

Abstract

The concentration of chiorpropham required to reduce primary-root elongation by 50°o was determined for more than 180 species of dicotyledons in laboratory tests and was found to vary from 0-01 ppm to more than 10 ppm. With certain exceptions, species within a family responded similarly; the Polygonaceae and Caryophyllaceae were the most susceptible and the Compositac were the mo.st tolerant. There was a general correspondence l>etween the test results and the relative susceptibility of species in the field. Tests with dilTerent varieties of Brassica oleracea and Daucus carota showed no significant diflerences in varietal response. Tolerance comparee de qttelquts dicotyledones au chlorprophamResume. I..a concentration de chlorpropham necessaire pour reduire de 50% IVIongation des racines pHmaires a ei6 ditennin^ pour plus de 180 especes de dicotylMones, au moyen d'essais en laboratoire; elle varie de 0,01 ppm a ptusde 10 ppm. A part quclques exceptions, les espices d'une meme famille reagissent de fa^on similaire. Ixs Poly-gonac^s et les Cjiryophyllac^es furent Ics plus sensibles et les Composes furent lea plus r^istantes. 11 y a une correspondance g^irale entre les r<^sultats des essais et la sensi-bilii^ relative des esptces au champ. Des essais avec difTiJrentes vari^t^s de Brassica oleracea ei Daucus carota n'ont pas montre de diflerences significatives entre les reactions decesvari6t6s. Die Widerstandsjahigkeit einiger Dikotylen gegenuber CIPCZusamiuenfassung. Die zur 50 prozentigen Reduktion des Primiirwurzelwachstutns erforderliche Konzentration von CIPC wurde in Laborversuehen fur mehr als 180 dikotyle /\rten bestimmt und lag zwischen 0,01 ppm und mehr als 10 ppm. Abgesehen von einigen Ausnahmen reagierten Arten innerhalb einer Familie ahnlich; die Polygonaceen und Caryophyllaceen waren am empfindlichsten, die Kompositen am widerstandsfahigsten. Es bestand eine allgcmeine Cbereinstimmung zwischen den Testcrgebnissen und der Empfindlichkeit der Arten im Feld. Tests mit verschiedenen Sorten von Brassica oleracea und Daucus carola zeigten keine signifikanten Untersehiede in ihrem Verhalten.

Biological Activity and Dissipation of IPC and CIPC

“…Rate of dissipation of the two herbicides in the field experiment was similar (Figure 1). Laboratory incubation 9 4…”

“…However, the ratio of activities varied greatly with species. Roberts (9) reported that among 180 dicoty ledon plants tested, buckwheat was the most sensitive species to CIPC. Our data support this fact; furthermore, buckwheat was more sensitive than any other grass species tested.…”

Common Buckwheat (Fagopyrum esculentum) Tolerance to Herbicides

“…to herbicides has shown that this crop is very susceptible to chlorpropham (1 -methylethyl -3 -chlorophenylcarbamate) (8,12) and trifluralin [2,6-…”

THE BIOLOGY OF CANADIAN WEEDS.: 46. Silene noctiflora L.

“…Stewart (1969b) (Stewart 1969a), the latter was found to give better control of S. noctiflora. Engstriim (1978) (Kirkland 1979\. In laboratory tests, Roberts (1965) Pening (1974) (Patch 1938 …”