Abstract
Abstract Potato mirid, Calocoris norvegicus , commonly occurs in white clover, Trifolium repens , crops in Canterbury, New Zealand. Its potential to reduce seed yield by feeding injury was investigated in field cage plots in a cv. Huia white clover seed crop. Third to fifth instar nymphs were released at five intensities ranging from 0 to 2 mirids per 5 stolons. Plant growth and inflorescence production were determined by regular measurements of 15–20 tagged stolons per cage. Seed was harvested in late summer and dressed into first and second quality seed for which thousand seed weights were recorded. No differences between plant growth and flowering pattern were observed between treatments, but inflorescence numbers were quad‐ratically reduced as mirid numbers increased. When total plot flowering and yield components were compared, a significant negative quadratic relationship between total inflorescences and first quality seed yield with increasing mirid intensity was demonstrated. For second quality seed yield a negative linear relationship was observed. A positive linear relationship between undamaged inflorescences and total yield per plot was also demonstrated. On the basis of current returns for white clover seed ($4 kg −1 ), losses of up to $740 ha −1 were estimated.
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Claims 7
Claim · model-written summary
Plant growth and flowering patterns did not differ among mirid treatments.
- Taxon
- white clover
Trifolium repenst0 - Treatment
- treatmentse0
- Interactor
- Calocoris norvegicust1pest
- Outcome
- plant growth and flowering patterne0
- Direction
- No differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences between plant growth and flowering pattern were observed between treatments”
t0“white clover seed production”
t1“Calocoris norvegicus”
Claim · model-written summary
Inflorescence numbers declined quadratically as mirid numbers increased.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- mirid numbers increasede0
- Outcome
- inflorescence numberse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inflorescence numbers were quad‐ratically reduced as mirid numbers increased”
t0“white clover”
Claim · model-written summary
Total inflorescence count had a significant negative quadratic relationship with mirid intensity.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- increasing mirid intensitye0
- Outcome
- total inflorescencese0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant negative quadratic relationship between total inflorescences and first quality seed yield with increasing mirid intensity”
t0“white clover”
Claim · model-written summary
First quality seed yield had a significant negative quadratic relationship with mirid intensity.
- Taxon
- white cloverTrifolium repenst0
- Treatment
- increasing mirid intensitye0
- Outcome
- first quality seed yielde0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant negative quadratic relationship between total inflorescences and first quality seed yield with increasing mirid intensity”
t0“white clover”
Claim · model-written summary
Second quality seed yield had a negative linear relationship with mirid intensity.
- Taxon
- white cloverTrifolium repenst0
- Interactor
- Calocoris norvegicust1pest
- Outcome
- second quality seed yielde0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For second quality seed yield a negative linear relationship was observed”
t0“white clover”
t1“Calocoris norvegicus”
Claim · model-written summary
Undamaged inflorescences were positively linearly related to total yield per plot.
- Taxon
- white cloverTrifolium repenst0
- Organ / stage
- undamaged inflorescencese0
- Outcome
- total yield per plote0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive linear relationship between undamaged inflorescences and total yield per plot was also demonstrated”
t0“white clover”
Claim · model-written summary
Estimated seed crop losses reached $740 per hectare at current white clover returns.
- Taxon
- white cloverTrifolium repenst0
- Outcome
- lossese0
- Value
- $740 ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“losses of up to $740 ha −1 were estimated”
t0“white clover”