Abstract
Grapevine downy mildew (GDM) is one of the most serious diseases of grapevines. Limitations to the use of copper-based products in organic agriculture according to the European Union (EU) regulation EU/2002/473 and the later EU Commission implementing regulation 2018/1981 have promoted a search for alternatives. This 5-year field trial evaluated the effectiveness of several strategies against GDM using different chitosan-based formulations and application rates in comparison with other natural compounds applied individually or with copper hydroxide. Trials were performed in commercial vineyards with different environmental conditions and grapevine cultivars. For the natural compounds applied as individual treatments, a 0.5%/0.8% chitosan formulation provided the best protection against GDM; the other compounds and formulations were less effective. When copper hydroxide use was halved by combining it with the natural compounds according to three different strategies, the GDM incidence, severity, and McKinney index were reduced, particularly for copper hydroxide applied in combination with the 0.5%/0.8% chitosan formulation. The 0.5%/0.8% chitosan formulation alone and with copper hydroxide provided good protection against GDM during both high-pressure and low-pressure disease seasons. Therefore, chitosan represents a good alternative to copper formulations for the control of GDM and both organic and integrated disease management.
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Claims 4
Claim · model-written summary
A 0.5%/0.8% chitosan formulation gave the best downy mildew protection among individually applied natural compounds.
- Treatment
- 0.5%/0.8% chitosan formulatione0
- Outcome
- protection against GDMe0
- Direction
- best protectione0
- Comparator
- other compounds and formulationse0
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the natural compounds applied as individual treatments, a 0.5%/0.8% chitosan formulation provided the best protection against GDM; the other compounds and formulations were less effective.”
e1“Grapevine downy mildew (GDM) is one of the most serious diseases of grapevines.”
Claim · model-written summary
Combining half the copper hydroxide with natural compounds reduced downy mildew incidence, severity and McKinney index.
- Treatment
- copper hydroxide use was halved by combining it with the natural compoundse0
- Outcome
- GDM incidence, severity, and McKinney indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When copper hydroxide use was halved by combining it with the natural compounds according to three different strategies, the GDM incidence, severity, and McKinney index were reduced”
e1“Grapevine downy mildew (GDM) is one of the most serious diseases of grapevines.”
Claim · model-written summary
The copper hydroxide plus 0.5%/0.8% chitosan combination particularly reduced downy mildew measures.
- Treatment
- copper hydroxide applied in combination with the 0.5%/0.8% chitosan formulatione0
- Outcome
- GDM incidence, severity, and McKinney indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the GDM incidence, severity, and McKinney index were reduced, particularly for copper hydroxide applied in combination with the 0.5%/0.8% chitosan formulation.”
e1“Grapevine downy mildew (GDM) is one of the most serious diseases of grapevines.”
Claim · model-written summary
The 0.5%/0.8% chitosan formulation protected grapevines in both high and low disease pressure seasons.
- Treatment
- 0.5%/0.8% chitosan formulation alonee0
- Outcome
- protection against GDMe0
- Direction
- good protectione0
- Qualifier
- both high-pressure and low-pressure disease seasonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 0.5%/0.8% chitosan formulation alone and with copper hydroxide provided good protection against GDM during both high-pressure and low-pressure disease seasons.”
e1“Grapevine downy mildew (GDM) is one of the most serious diseases of grapevines.”
The same questions in other papers
Copper hydroxide · disease · VitisPositive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
chitosan · disease · VitisResults agree
20 papers in the same direction as this paper
- positive
- positive
- positive
17 papers more in this group
See all 21 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.