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1 July 2008 Evaluation of Weed Control and Crop Safety with Herbicides in Open Field Tree Nurseries
Bradley D. Hanson, Sally A. Schneider
Author Affiliations +
Abstract

Open field production of fruit and nut-tree nursery stock depends upon preplant soil fumigation, extensive tillage, and hand-labor throughout the growing season for adequate weed control. Because methyl bromide, the favored fumigant, is being phased out because of environmental concerns and the costs of both fuel and labor continue to rise, herbicides are likely to become a more important weed management tool in the tree nursery industry. Two trials were conducted to evaluate weed control and crop safety with several herbicides applied following fumigation with methyl bromide or 1,3-dichloropropene in central California stone-fruit nurseries. PRE and POST-directed applications of several labeled and unlabeled materials were applied in a band over seeded peach rootstock or applied after emergence with a drop-nozzle spray boom. Crop productivity and weed control were monitored throughout the 1-yr growing season. PRE oryzalin and dithiopyr treatments provided the best weed control with very little crop injury. PRE applications of flumioxazin, rimsulfuron, and sulfentrazone did not have adequate crop safety at the rates and timings tested. However, POST-directed applications of flumioxazin and rimsulfuron were much safer to the peach and almond crops and should be evaluated in future trials. Additional herbicides and application techniques are needed to find acceptable, safe control measures for weeds, such as California burclover, common mallow, and redstem filaree, which often are poorly controlled with preplant fumigation in tree nurseries.

Nomenclature: Dithiopyr; flumioxazin; isoxaben; oryzalin; prodiamine; rimsulfuron; sulfentrazone; California burclover, Medicago hispida Gaertn. MEDPO; common mallow, Malva parviflora L. MALPA; redstem filaree, Erodium cicutarium L EROCI; almond, Prunus dulcis Mill.; peach, Prunus persica Batsch

Bradley D. Hanson and Sally A. Schneider "Evaluation of Weed Control and Crop Safety with Herbicides in Open Field Tree Nurseries," Weed Technology 22(3), 493-498, (1 July 2008). https://doi.org/10.1614/WT-08-021.1
Received: 15 February 2008; Accepted: 1 April 2008; Published: 1 July 2008
KEYWORDS
Bare root tree
herbicide screening
methyl bromide alternatives
selectivity
tolerance
tree Nursery
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