Abstract
The sugarbeet root maggot, Tetanops myopaeformis (von Röder) (Diptera: Ulidiidae), is a major pest of sugar beet Beta vulgaris L. (Carophyllales: Amaranthaceae)in the United States and Canada. Larval feeding on roots can reduce both stand and yield. Current management practices are heavily reliant on chemical control. However, the carbamate and organophosphate insecticides that are commonly used against T. myopaeformis are being phased out of use. Host plant resistance against this pest shows promise, but difficulties with maintaining T. myopaeformis in culture have largely limited such studies to the field. A primary objective of this study was to develop protocols for rearing a laboratory colony of T. myopaeformis that would expedite assays aimed at screening for host plant resistance. Third (final) instar larvae were collected from the field and reared to the adult stage. These laboratory-reared adults laid eggs and ultimately produced a second generation of third-instar larvae in the lab. Adult flies reared from field-collected larvae were used to examine the modality of resistance of a known resistant variety by performing no-choice and paired-choice experiments alongside a susceptible variety in the greenhouse. Paired-choice tests showed no difference in oviposition rates between the two varieties, whereas no-choice tests showed significantly greater feeding damage and abundance of larvae on the susceptible variety. For the resistant variety examined here, we observed evidence of antibiosis, not antixenosis, as the putative modality of resistance. Our laboratory and greenhouse protocols can be used to expedite the process of developing varieties with resistance to this key pest of sugar beet.
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Claims 6
Claim · model-written summary
Laboratory reared adults produced second generation third instar larvae.
- Taxon
- sugar beet Beta vulgaris L.
Beta vulgarise1 - Interactor
- Tetanops myopaeformisTetanops myopaeformise2pest
- Outcome
- second generation of third-instar larvaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These laboratory-reared adults laid eggs and ultimately produced a second generation of third-instar larvae in the lab”
e1“sugar beet Beta vulgaris L.”
e2“Tetanops myopaeformis (von Röder)”
Claim · model-written summary
Paired choice tests found no difference in oviposition rates between resistant and susceptible varieties.
- Taxon
- sugar beet Beta vulgaris L.Beta vulgarise1
- Interactor
- Tetanops myopaeformisTetanops myopaeformise2pest
- Outcome
- oviposition ratese0
- Direction
- no differencee0
- Comparator
- the two varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paired-choice tests showed no difference in oviposition rates between the two varieties”
e1“sugar beet Beta vulgaris L.”
e2“Tetanops myopaeformis (von Röder)”
Claim · model-written summary
No choice tests found significantly greater feeding damage on the susceptible variety.
- Taxon
- sugar beet Beta vulgaris L.Beta vulgarise1
- Material
- susceptible varietye0
- Interactor
- Tetanops myopaeformisTetanops myopaeformise2pest
- Outcome
- feeding damagee0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no-choice tests showed significantly greater feeding damage and abundance of larvae on the susceptible variety”
e1“sugar beet Beta vulgaris L.”
e2“Tetanops myopaeformis (von Röder)”
Claim · model-written summary
No choice tests found significantly greater larval abundance on the susceptible variety.
- Taxon
- sugar beet Beta vulgaris L.Beta vulgarise1
- Material
- susceptible varietye0
- Interactor
- Tetanops myopaeformisTetanops myopaeformise2pest
- Outcome
- abundance of larvaee0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no-choice tests showed significantly greater feeding damage and abundance of larvae on the susceptible variety”
e1“sugar beet Beta vulgaris L.”
e2“Tetanops myopaeformis (von Röder)”
Claim · model-written summary
The authors inferred antibiosis rather than antixenosis in the resistant variety.
- Taxon
- sugar beet Beta vulgaris L.Beta vulgarise1
- Material
- resistant varietye0
- Interactor
- Tetanops myopaeformisTetanops myopaeformise2pest
- Outcome
- antibiosis, not antixenosise0
- Qualifier
- putative modality of resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the resistant variety examined here, we observed evidence of antibiosis, not antixenosis, as the putative modality of resistance”
e1“sugar beet Beta vulgaris L.”
e2“Tetanops myopaeformis (von Röder)”
Claim · model-written summary
The protocols can expedite development of root maggot resistant sugar beet varieties.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarise0 - Interactor
- Tetanops myopaeformisTetanops myopaeformise1pest
- Outcome
- expedite the process of developing varieties with resistancee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our laboratory and greenhouse protocols can be used to expedite the process of developing varieties with resistance to this key pest of sugar beet”
e1“Tetanops myopaeformis (von Röder)”