WEED CONTROL AND TOMATO TOLERANCE TO UNREGISTERED HERBICIDES AND TANK MIXES IN ONTARIO

Field studies were conducted at two locations in south-western Ontario in 2003 and 2004, to determine weed control and tolerance of processing tomatoes to clomazone, flumioxazin and low rates of mesotrione in conjunction with an industry standard (IS) treatment of s-metolachlor (1200 g a.i. ha^-1) plus metribuzin (700 g a.i. ha^-1). The addition of clomazone (420 g a.i. ha^-1) to the IS improved velvetleaf (Abutilon theophrasti Medic.) and common ragweed (Ambrosia artemisiifolia L.) control over that measured in the IS alone in all site years.
The addition of flumioxazin (52.5 g a.i. ha^-1) to the IS increased control of velvetleaf, common lamb’s-quarters (Chenopodium album L.) and common ragweed over that in the IS alone.
The mesotrione (25 g a.i. ha^-1) plus IS treatment gave greater control of velvetleaf and common ragweed than IS alone.
None of the treatments caused commercially unacceptable visual injury or reductions in marketable tomato yield.
The addition of clomazone, flumioxazin or mesotrione to the current IS used for Ontario processing tomatoes improved control of velvetleaf and common ragweed, and in severe weed infestations may improve overall yields.
In those fields where common lamb’s-quarters have become resistant to metribuzin, the addition of flumioxazin would be a useful tool for processing tomato growers.

IX International Symposium on the Processing Tomato

D.E. Robinson, A.S. Hamill

Lycopersicon esculentum Mill., herbicide tolerance, Abutilon theophrasti Medic., Chenopodium album L., Ambrosia artemisiifolia L.

https://doi.org/10.17660/ActaHortic.2006.724.19