Abstract
An account is given of the history of chemical control Phthorimaea operculella (Zell.) in potato fields in Rhodesia since the introduction of DDt prior to 1952. The failure of DDT and endrin, in routine spraying, to control field infestations is reproted, and some evidence that this is due to insecticide resistance is given. The results of critical field trials made in 1961, 1964 and 1965 to evaluate a range of insecticides for control of P. operculella and for their effects on populations of Macrosiphum euphorbiae (Thos.) are presented, together with the results of some laboratory tests. Good control of P. operculella in the field was obtained with sprays of azinphos-methyl at the rate of 0.5 lb active ingredient in 20 gal. water per acre, and two new compounds, methidathion and chlorfenvinphos, showed promise for the future.
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Claims 3
Claim · model-written summary
DDT and endrin, in routine spraying, failed to control field infestations of Phthorimaea operculella in potato.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- DDT and endrin, in routine sprayinge1
- Interactor
- Phthorimaea operculella
Phthorimaea operculellae0pest - Outcome
- control field infestationse1
- Direction
- failuree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chemical control Phthorimaea operculella (Zell.) in potato fields in Rhodesia”
e1“The failure of DDT and endrin, in routine spraying, to control field infestations is reproted”
Claim · model-written summary
Sprays of azinphos-methyl at 0.5 lb active ingredient per acre gave good control of P. operculella in the field.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- sprays of azinphos-methyl at the rate of 0.5 lb active ingredient in 20 gal. water per acree2
- Interactor
- P. operculellaPhthorimaea operculellae2pest
- Outcome
- control of P. operculella in the fielde2
- Setting
- Rhodesiae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chemical control Phthorimaea operculella (Zell.) in potato fields in Rhodesia”
e2“Good control of P. operculella in the field was obtained with sprays of azinphos-methyl at the rate of 0.5 lb active ingredient in 20 gal. water per acre”
Claim · model-written summary
Methidathion and chlorfenvinphos showed promise for the future as control agents.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- methidathion and chlorfenvinphose3
- Interactor
- Phthorimaea operculellaPhthorimaea operculellae0pest
- Outcome
- promise for the futuree3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chemical control Phthorimaea operculella (Zell.) in potato fields in Rhodesia”
e3“two new compounds, methidathion and chlorfenvinphos, showed promise for the future”
The same questions in other papers
azinphos-methyl · Phthorimaea operculella · Solanum tuberosum (potato)Results agree
2 papers in the same direction as this paper
- positive
- positive
application · Phthorimaea operculella · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.