Abstract
Abstract The impact of parasitoids on pests varies between conventional and low‐intensity agricultural systems. Although the impacts on parasitoid natural enemies of many practices within these agricultural systems are well understood, the role of fertilisers has been less well studied. The effects of organic‐based and conventional fertilisers on Hordeum vulgare L. (Poaceae), the aphid Metopolophium dirhodum Walker (Hemiptera: Aphididae), and its parasitoid Aphidius ervi Haliday (Hymenoptera: Braconidae) was investigated using cage release experiments and measures of aphid and parasitoid fitness were taken. Barley tiller number and aphid weight were increased by fertilisers, particularly under conventional treatments. Adult parasitoid size correlated positively with that of the host, M . dirhodum , whereas percentage parasitism was not affected by fertiliser treatment or host size. The results suggest that the increased parasitoid impact observed in some low‐intensity or organic systems is not a direct result of fertiliser treatment. Our results indicate that fertiliser treatments that improve cereal‐aphid fitness will improve parasitoid fitness as measured by parasitoid size but may not influence percentage parasitism.
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Claims 2
Claim · model-written summary
Fertilisers increased barley tiller number, particularly conventional treatments.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- fertiliserse0
- Outcome
- tiller numbere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Barley tiller number and aphid weight were increased by fertilisers, particularly under conventional treatments.”
Claim · model-written summary
Fertilisers increased aphid weight, particularly conventional treatments.
- Taxon
- BarleyHordeum vulgaree0
- Treatment
- fertiliserse0
- Interactor
- aphide0pest
- Outcome
- aphid weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Barley tiller number and aphid weight were increased by fertilisers, particularly under conventional treatments.”
The same questions in other papers
fertilization · yield · Hordeum vulgare (barley)Positive and negative results
472 papers in the same direction as this paper · 66 in the opposite direction · 11 reporting no difference from an alternative
- no effect
- negative
- negative
546 papers more in this group
See all 550 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.