On the sensitivity of seven legumes to the herbicide tetrapon

Abstract

A trial was conducted in a glasshouse to screen seven legumes for their sensitivity to tetrapion. The application rates were 0g, 750g, 1500g and 3000g a.i./ha. Lotus corniculatus and Vicia dasycarpa were not visibly affected even at the highest rates. L. pedunculatus was affected slightly and Coronilla varia was probably also affected slightly. Medicago sativa was affected moderately severely while Trifolium pratense and T. subterraneum were affected severely.

The legumes which were not severely affected by tetrapion show promise in the Dohne Sourveld and should be used in the nassella eradication campaign. The need for further screening and research is stressed.

Uittreksel

‘n Proef is in ‘n glashuis uitgevoer om ‘n aantalpeulplante te keur ten opsigte van hulle gevoeligheid vir tetrapion. Die gifstof is toegedien teen Og, 750g, 1500g en 3000g a.b./ha. Lotus corniculatus en Vicia dasycarpa is selfs nie by die höogste peil sigbaar geaffekteer nie. L. pedunculatus is slegs lig geaffekteer en Coronilla varia is waarskynlik ook lig geaffekteer. Medicago sativa is matig geaffekteer, en beide Trifolium pratense en T. subterraneum is straf geaffekteer.

Die peulplante wat nie straf geaffekteer is nie hou belofte in vir gebruik in die Dohne Suurveld en kan in die nassellabestrydingsveldtog gebruik word. Die noodsaaklikheid van meer keuring en navorsing word beklemtoon.

Additional index words:

• Lotus spp.
• Vicia spp.
• Trifolium spp.
• Trifolium spp. Coronilla
• Medicago