ZUR SELEKTIVITAT VON PHENMEDIPHAM ALS NACHAUFLAUFHERBIZID IN BETA-RUBEN*
1968; Wiley; Volume: 8; Issue: 4 Linguagem: Inglês
10.1111/j.1365-3180.1968.tb01430.x
ISSN1365-3180
Autores Tópico(s)Plant Parasitism and Resistance
ResumoSummary. Sugar beet are outstandingly tolerant to 3–methoxycarbonyIaminophenyl‐A′‐(3′‐methylphenyl) carbamate phenmedipham) and the difference in susceptibility between the main weeds prevalent in beet crops and the beet themselves can be used to obtain selective weed control. The herbicide is applied post‐emergence; action via the soil can be excluded as non‐existent. A test with twenty‐nine varieties of sugar beet and one variety of fodder beet showed no interaction between phytotoxicity and variety. No variety particularly susceptible to phenmedipham was found. Investigations on the mode of action and selectivity proved that phenmedipham is a strong inhibitor of the Hill reaction. There were no differences in the extent of inhibition of the Hill reaction in chloroplasts of a sensitive plant (mustard) as compared with a resistant species (sugar beet). Measurements of photosynthesis using infra‐red absorption methods and intact plants showed that it was inhibited in both sensitive and resistant species: the degree of inhibition, however, varied according to the species. In contrast to susceptible weeds, the resistant sugar beet and Amarantus relroflexus showed recovery in assimilation, and the recovery phases were significant. It can thus be concluded that sugar beet and A. retroftexus are able to inactivate phenmedipham. Sélectivité du phenmediphame, herbicide de post‐levée dans les cultures de de betteraves sucrièes
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