Abstract
The natural product chitosan has been shown to reduce plant disease severity and enhance the efficacy of microbial biocontrol agents in several crops. However, little is known about the potential synergisms between chitosan and biopesticides and best use practices in apple production. The objectives of this study were to evaluate the effect of pre-harvest applications of chitosan alone and in combination with a commercial biopesticide to suppress fungal diseases of apple and to investigate the potential for chitosan to reduce the quantity of overwintering Venturia inaequalis spores in orchard leaf litter. Chitosan products, Tidal Grow and ARMOUR-Zen 15, and a commercial biopesticide, Serenade ASO, were tested in a research orchard in Pennsylvania and commercial orchards in New Hampshire. Chitosan applications reduced apple scab incidence and severity by up to 55% on fruit compared to the water control. Chitosan also reduced sooty blotch, flyspeck, and rust incidence on fruit. Furthermore, a chitosan + biopesticide treatment overlayed onto a grower standard spray program reduced diseases more effectively than the grower standard alone. However, this efficacy was dependent on the cultivar and pathogen. Chitosan did not reduce overwintering V. inaequalis ascospores. This research provides evidence that pre-harvest chitosan applications have the potential for disease management in apple production.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Chitosan reduced apple scab incidence on fruit by up to 55% against water control.
- Taxon
- apple
Malus domesticae0 - Organ / stage
- fruite0
- Treatment
- Chitosan applicationse0
- Outcome
- apple scab incidencee0
- Direction
- reducede0
- Value
- up to 55%e0
- Comparator
- water controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chitosan applications reduced apple scab incidence and severity by up to 55% on fruit compared to the water control”
Claim · model-written summary
Chitosan reduced apple scab severity on fruit by up to 55% against water control.
- Taxon
- appleMalus domesticae0
- Treatment
- Chitosan applicationse0
- Outcome
- apple scab incidence and severitye0
- Direction
- reducede0
- Value
- up to 55%e0
- Comparator
- water controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chitosan applications reduced apple scab incidence and severity by up to 55% on fruit compared to the water control”
Claim · model-written summary
Chitosan reduced sooty blotch incidence on apple fruit.
- Taxon
- AppleMalus domesticat0
- Treatment
- Chitosane0
- Outcome
- sooty blotch, flyspeck, and rust incidence on fruite0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chitosan also reduced sooty blotch, flyspeck, and rust incidence on fruit”
t0“Apple”
Claim · model-written summary
Adding chitosan and biopesticide to a standard spray program improved disease control relative to standard spray alone.
- Taxon
- AppleMalus domesticat0
- Treatment
- chitosan + biopesticide treatmente0
- Outcome
- diseasese0
- Direction
- reducede0
- Comparator
- grower standard alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a chitosan + biopesticide treatment overlayed onto a grower standard spray program reduced diseases more effectively than the grower standard alone”
t0“Apple”
Claim · model-written summary
Combined treatment efficacy depended on cultivar and pathogen.
- Taxon
- AppleMalus domesticat0
- Material
- cultivare0
- Outcome
- efficacye0
- Qualifier
- dependent on the cultivar and pathogene0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this efficacy was dependent on the cultivar and pathogen”
t0“Apple”
Claim · model-written summary
Chitosan did not reduce overwintering V. inaequalis ascospores.
- Taxon
- AppleMalus domesticat0
- Treatment
- Chitosane0
- Interactor
- V. inaequalis
Venturia inaequalise0pathogen - Outcome
- overwintering V. inaequalis ascosporese0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chitosan did not reduce overwintering V. inaequalis ascospores”
t0“Apple”
The same questions in other papers
chitosan · disease · Malus domestica (apple)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- positive
4 papers more in this group
See all 8 papers →biocontrol · disease · Malus domestica (apple)Results agree
15 papers in the same direction as this paper
- positive
- positive
- positive
12 papers more in this group
See all 16 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.