Abstract
In trials at Beaford, north Devon, and at Galmpton, south Devon, in 1945. proprietary preparations of copper oxychloride, cuprous oxide, and cuprammonium, used at low‐copper dosage (0.063 % Cu), were compared with Bordeaux mixture at the same and at higher dosages for the control of potato blight under two commonly recurring conditions of disease incidence, respectively early and late, which were closely defined by foliage decay curves. All the copper fungicides were tested with and without added adhesive of caseinate‐rosin soap type, and two sulphur fungicides: lime sulphur (1 in 50) and Dithane 14 (1 in 200) with zinc sulphate and lime, were also included. The trials were made on four‐times replicated plots at both centres; special precautions were taken to avoid confusion of the observations by concurrent mineral deficiency and virus disorders; and the treatments were compared by three criteria: (1) direct foliage protection, (2) spray retention and (3) indirect effect on yield. The number of spray applications was reduced to a minimum to avoid masking the superiority of the better treatments, and timed as nearly as possible for maximum effect in relation to weather conditions. Thus two applications were given at Galmpton and three at Beaford. None of the proprietary copper fungicides used at low‐copper dosage, with or without added adhesive, equalled plain (4.5.40) Bordeaux mixture in spray retention or direct protective effect; and none gave any significantly better protection than Bordeaux mixture at correspondingly reduced copper dosage (1.11/2.40). With the few well‐timed and thorough sprayings given, however, the 1% Bordeaux mixture itself gave almost sufficient protection for the production of a full crop, and the trials indicated horticultural conditions under which low‐copper fungicides can be used with success, while pointing to the important factor of safety secured by using 1 % Bordeaux mixture in routine agricultural practice. Both of the sulphur fungicides were less effective than i % Bordeaux mixture.
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Claims 5
Claim · model-written summary
Low-dose proprietary copper fungicides did not equal plain Bordeaux mixture in spray retention.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- proprietary copper fungicidese0
- Outcome
- spray retentione0
- Direction
- Nonee0
- Comparator
- Bordeaux mixturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the proprietary copper fungicides used at low‐copper dosage, with or without added adhesive, equalled plain (4.5.40) Bordeaux mixture in spray retention or direct protective effect”
t0“potato”
Claim · model-written summary
Low-dose proprietary copper fungicides did not equal plain Bordeaux mixture in direct protection.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- proprietary copper fungicidese0
- Outcome
- direct protective effecte0
- Direction
- Nonee0
- Comparator
- Bordeaux mixturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the proprietary copper fungicides used at low‐copper dosage, with or without added adhesive, equalled plain (4.5.40) Bordeaux mixture in spray retention or direct protective effect”
t0“potato”
Claim · model-written summary
Low-dose proprietary copper fungicides gave no significantly better protection than Bordeaux at equivalent copper dose.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- proprietary copper fungicidese0
- Outcome
- protectione0
- Direction
- nonee0
- Comparator
- Bordeaux mixturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the proprietary copper fungicides used at low‐copper dosage, with or without added adhesive, equalled plain (4.5.40) Bordeaux mixture in spray retention or direct protective effect; and none gave any significantly better protection than Bordeaux mixture at correspondingly reduced copper dosage”
t0“potato”
Claim · model-written summary
One-percent Bordeaux mixture gave nearly enough protection for a full crop.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- 1% Bordeaux mixturee0
- Outcome
- protection for the production of a full crope0
- Direction
- almost sufficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 1% Bordeaux mixture itself gave almost sufficient protection for the production of a full crop”
t0“potato”
Claim · model-written summary
Both sulphur fungicides were less effective than Bordeaux mixture.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- sulphur fungicidese0
- Outcome
- less effectivee0
- Direction
- less effectivee0
- Comparator
- i % Bordeaux mixturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both of the sulphur fungicides were less effective than i % Bordeaux mixture”
t0“potato”
The same questions in other papers
copper atom · control · Solanum tuberosum (potato)Positive and negative results
1 in the opposite direction
- positive
fungicide · control · Solanum tuberosum (potato)Positive and negative results
6 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
19 papers more in this group
See all 23 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.