R. Rodríguez, R. Flores, R. De Prado
The effects of the herbicides diuron and chlorsulfuron on young olive trees (Olea europaea) and on the two main annual weeds (Amaranthus blitoides and Lolium rigidum) of this crop in the south of Spain, are studied in this work. Both herbicides were applied to the leaves, and soil under olives trees. The level of fluorescence was measured for diuron, and leaf chlorophyll content and longitudinal growth were measured for both herbicides.

As a result of the treatment with diuron, the olive trees showed higher levels of fluorescence in the foliar treatment than in the soil treatment (with leaves present before treatment and for doses of 1.5, 3 and 5 kg ai ha-1). When leaves developed after treatment were measured, it was found that the level of fluorescence was lower than before (for all doses and both treatments). This could be explained by the detoxification of the herbicides producing inactive metabolites. Diuron applied in pre-emergence showed a better control on A. blitoides than on L. rigidum.

When applied to olive leaves, chlorsulfuron caused an increase of leaf-budding, malformations and a halt in growth for three months after treatment application (at doses of 15, 30 and 60 g ai ha-1). There was a negative growth with the higher dose due to a necrosis of the leaves. This herbicide applied to the soil showed the same symptoms but with lower levels. In the treatment with chlorsulfuron in pre-emergence and post-emergence to both weeds, there was good control on A. blitoides, but there was no effect on L. rigidum.

Rodríguez, R., Flores, R. and De Prado, R. (1994). EFFECTS OF DIURON AND CHLORSULFURON ON OLIVE TREES. Acta Hortic. 356, 422-425
DOI: 10.17660/ActaHortic.1994.356.91

Acta Horticulturae