Abstract
The avocado industry has comprehensive guidelines for groundbased spray application to avocado orchards but there are no current guidelines for aerial spray applications Helicopterapplied deposits from a dilute spray application (600 litres/ha) of copper on a commercial Hass avocado orchard (12 m tall trees) were compared with twotimes (300 litres/ha) and threetimes (200 litres/ha) concentrate sprays with addition of varying rates of the superspreader adjuvant DuWett Tartrazine dye was included as a deposit tracer Concentrate sprays with adjuvant addition consistently gave higher spray deposits on difficulttowet fruit than the dilute aerial spray Deposits on fruit in all canopy zones were increased with concentrate sprays but particularly in the upper lower and outer canopy zones On foliage concentrate sprays with adjuvant addition gave similar spray deposits to the dilute spray Leaves in mid and inner canopy zones tended to be less well targeted by concentrate sprays This must be considered if targeting dense trees with aerial sprays
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Claims 5
Claim · model-written summary
Concentrate sprays with adjuvant deposited more spray on difficult-to-wet avocado fruit than dilute aerial spray.
- Taxon
- avocado
Persea americanae1 - Treatment
- Concentrate sprays with adjuvant additione0
- Outcome
- spray deposits on difficulttowet fruite0
- Direction
- highere0
- Comparator
- dilute aerial spraye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrate sprays with adjuvant addition consistently gave higher spray deposits on difficulttowet fruit than the dilute aerial spray”
e1“commercial Hass avocado orchard”
Claim · model-written summary
Concentrate sprays increased fruit deposits across canopy zones, especially upper, lower and outer zones.
- Taxon
- avocadoPersea americanae1
- Treatment
- concentrate sprayse0
- Outcome
- Deposits on fruite0
- Direction
- increasede0
- Qualifier
- upper lower and outer canopy zonese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deposits on fruit in all canopy zones were increased with concentrate sprays but particularly in the upper lower and outer canopy zones”
e1“commercial Hass avocado orchard”
Claim · model-written summary
Foliage deposits from concentrate sprays with adjuvant were similar to dilute spray deposits.
- Taxon
- avocadoPersea americanae1
- Organ / stage
- foliagee0
- Treatment
- concentrate sprays with adjuvant additione0
- Outcome
- spray depositse0
- Direction
- similare0
- Comparator
- dilute spraye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On foliage concentrate sprays with adjuvant addition gave similar spray deposits to the dilute spray”
e1“commercial Hass avocado orchard”
Claim · model-written summary
Concentrate sprays tended to target mid and inner canopy leaves less well.
- Taxon
- avocadoPersea americanae1
- Treatment
- concentrate sprayse0
- Outcome
- Leaves in mid and inner canopy zonese0
- Direction
- less well targetede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves in mid and inner canopy zones tended to be less well targeted by concentrate sprays”
e1“commercial Hass avocado orchard”
Claim · model-written summary
The authors advise considering poor coverage of inner and mid canopy leaves when aerially spraying dense trees.
- Taxon
- avocadoPersea americanae1
- Outcome
- This must be considered if targeting dense trees with aerial sprayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves in mid and inner canopy zones tended to be less well targeted by concentrate sprays This must be considered if targeting dense trees with aerial sprays”
e1“commercial Hass avocado orchard”
The same questions in other papers
application · growth · Persea americana (avocado)Positive and negative results
1 paper in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 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.