Abstract
The damage caused by Pratylenchus penetrans in orchards is discussed. In 2 experimental fields containing 4 varieties of apple, there was good evidence of a decrease in yield with increased nematode density before apple seedlings were planted. Heavy nematode infestations reduced shoot growth by more than 50%. A concentration of 100 nematodes per 300 ml. of soil may cause considerable damage. The process of infestation and symptoms of nematode attack under field and experimental conditions are discussed. In clean cultivated orchards on light sandy soils there are often large populations in the roots and very small populations in the soil but on heavier soils, the converse is true. Hoestra & Oostenbrink conclude without doubt that P. penetrans is an important cause of replant problems in orchards. H.R. W. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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Claims 6
Claim · model-written summary
Apple yield decreased as preplant nematode density increased.
- Taxon
- apple
Malus domesticae0 - Interactor
- Pratylenchus penetrans
Pratylenchus penetranst0pest - Outcome
- yielde0
- Direction
- decreasee0
- Qualifier
- before apple seedlings were plantede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was good evidence of a decrease in yield with increased nematode density before apple seedlings were planted”
t0“Pratylenchus penetrans”
Claim · model-written summary
Heavy nematode infestations reduced apple shoot growth by more than 50%.
- Taxon
- appleMalus domesticae1
- Treatment
- Heavy nematode infestationse0
- Interactor
- Pratylenchus penetransPratylenchus penetranst1peste1
- Outcome
- shoot growthe0
- Direction
- reducede0
- Value
- more than 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heavy nematode infestations reduced shoot growth by more than 50%”
e1“apple seedlings were planted”
t1“Pratylenchus penetrans”
Claim · model-written summary
A density of 100 nematodes per 300 ml of soil may cause considerable orchard damage.
- Taxon
- appleMalus domesticae1
- Interactor
- Pratylenchus penetransPratylenchus penetranst1pest
- Outcome
- considerable damagee0
- Value
- 100 nematodes per 300 ml. of soile0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A concentration of 100 nematodes per 300 ml. of soil may cause considerable damage”
e1“apple seedlings were planted”
t1“Pratylenchus penetrans”
Claim · model-written summary
On light sandy soils in clean cultivated orchards, nematode populations were often large in roots and very small in soil.
- Taxon
- appleMalus domesticae1
- Interactor
- Pratylenchus penetransPratylenchus penetranst1pest
- Outcome
- large populations in the roots and very small populations in the soile0
- Setting
- clean cultivated orchards on light sandy soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In clean cultivated orchards on light sandy soils there are often large populations in the roots and very small populations in the soil”
e1“apple seedlings were planted”
t1“Pratylenchus penetrans”
Claim · model-written summary
On heavier soils the root and soil nematode population pattern was reversed.
- Taxon
- appleMalus domesticae1
- Interactor
- Pratylenchus penetransPratylenchus penetranst1pest
- Outcome
- the converse is truee0
- Setting
- heavier soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on heavier soils, the converse is true”
e1“apple seedlings were planted”
t1“Pratylenchus penetrans”
Claim · model-written summary
The authors concluded that P. penetrans is an important cause of orchard replant problems.
- Taxon
- appleMalus domesticae1
- Interactor
- P. penetransPratylenchus penetranse0pest
- Outcome
- replant problemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. penetrans is an important cause of replant problems in orchards”
e1“apple seedlings were planted”