TY - JOUR
T1 - Repercussions of four herbicides on reproductive and vegetative development in potted grapevines
AU - Rossouw, G. C.
AU - Holzapfel, B. P.
AU - Rogiers, S. Y.
AU - Gouot, J. C.
AU - Schmidtke, L. M.
PY - 2019/7
Y1 - 2019/7
N2 -
Background and Aims
Spring drift of herbicides can have devastating
consequences on grapevines. The impact of 2,4-dichlorophenoxyacetic acid
(2,4-D), dichloro-2-methoxybenzoic acid (Dicamba),
2-methyl-4-chlorophenoxyacetic acid (MCPA) and glyphosate exposure on
reproductive and vegetative development was investigated.
Methods and Results
Simulated herbicide drifts were applied to potted vines
at the cessation of flowering. Leaf gas exchange and biomass, root
structural biomass and carbohydrate reserves, fruit yield and compound
bud necrosis were assessed, along with berry composition, including the
primary metabolites, at fruit maturity. Fruit yield was reduced by 2,4-D
without any detriment to most aspects of berry composition. While root
structural development was curtailed by 2,4-D, Dicamba and MCPA, none of
the herbicides altered the reserve level of root total non-structural
carbohydrates. Primary bud necrosis was evident following 2,4-D and
Dicamba exposure, especially in younger buds.
Conclusions
Exposure to 2,4-D may be particularly damaging to fruit
yield during the current season because of an increased risk of bunch
necrosis. Bud fruitfulness can be impaired by 2,4-D and Dicamba because
of the increased potential for primary bud necrosis.
Significance of the Study
Auxin-type herbicides can limit fruit yield during the
current and next season. Compared to cane pruning, spur pruning may
minimise the detrimental effects of these herbicides on fruitfulness.
AB -
Background and Aims
Spring drift of herbicides can have devastating
consequences on grapevines. The impact of 2,4-dichlorophenoxyacetic acid
(2,4-D), dichloro-2-methoxybenzoic acid (Dicamba),
2-methyl-4-chlorophenoxyacetic acid (MCPA) and glyphosate exposure on
reproductive and vegetative development was investigated.
Methods and Results
Simulated herbicide drifts were applied to potted vines
at the cessation of flowering. Leaf gas exchange and biomass, root
structural biomass and carbohydrate reserves, fruit yield and compound
bud necrosis were assessed, along with berry composition, including the
primary metabolites, at fruit maturity. Fruit yield was reduced by 2,4-D
without any detriment to most aspects of berry composition. While root
structural development was curtailed by 2,4-D, Dicamba and MCPA, none of
the herbicides altered the reserve level of root total non-structural
carbohydrates. Primary bud necrosis was evident following 2,4-D and
Dicamba exposure, especially in younger buds.
Conclusions
Exposure to 2,4-D may be particularly damaging to fruit
yield during the current season because of an increased risk of bunch
necrosis. Bud fruitfulness can be impaired by 2,4-D and Dicamba because
of the increased potential for primary bud necrosis.
Significance of the Study
Auxin-type herbicides can limit fruit yield during the
current and next season. Compared to cane pruning, spur pruning may
minimise the detrimental effects of these herbicides on fruitfulness.
KW - chemical spray drift
KW - crop injury
KW - grapevine pruning
KW - primary bud necrosis
KW - root growth
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U2 - 10.1111/ajgw.12395
DO - 10.1111/ajgw.12395
M3 - Article
AN - SCOPUS:85065179006
SN - 1322-7130
VL - 25
SP - 316
EP - 326
JO - Australian Journal of Grape and Wine Research
JF - Australian Journal of Grape and Wine Research
IS - 3
ER -