Tolerance of Grindelia chiloensis (Asteraceae) to pre- and postemergence herbicides

RAVETTA, D.A.; VILELA, A.E.; D.F. WASSNER ; CIANO, N.

Industrial Crops and Products

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2002 vol. 15 p. 201 - 211

0926-6690

AbstractSeveral species of Grindelia (Asteraceae) are known to produce diterpene resin acids with potential uses in the navalstores industry. In recent years, the focus has changed from G. camporum to Grindelia chiloensis as the main candidatefor domestication, because of its significantly higher resin content. Most agronomic technology developed for G.camporum has been adapted to G. chiloensis, although weed competition continues to be a problem duringestablishment, resulting in reductions in plant stands. The objective of this work was to evaluate pre- andpostemergence herbicides for weed control in irrigated stands of G. chiloensis. Two greenhouse and field experimentswere conducted to evaluate the effect of commercially available broad-spectrum herbicides on biomass productionand resin content. Only Dual 8E, Karmex 80DF, AAtrex, and Caparol 4L at intermediate to low doses can be usedsafely as preemergent herbicides. Once the stand has been established, either by direct seeding or by clonetransplanting, pendimenthalin, linuron, propaquazifop, haloxifop-R-methyl, or fluazifop-p-butyl, can be used,because, biomass accumulation was not affected by these herbicides. MCPA when applied at the six to ten leaf stagecaused severe damage and plant mortality. Resin content ranged between 22 to 25% (dry weight basis) and nodifferences were present between the treated and control plants. © 2002 Elsevier Science B.V. All rights reserved.Keywords: Resin; Herbicides; New crops; Grindelia