Abstract
Although intermittent water stress is largely beneficial and continuous water stress largely detrimental to the reproduction and survival of Myzus persicae and Brevicoryne brassicae feeding on Brussels sprouts, there are differences between the species on different leaf ages. During intermittent water stress in the old leaves, the normal feeding stratum of M. persicae , this aphid is relatively more successful than B. brassicae. During continuous water stress in the young leaves, the normal feeding stratum of B. brassicae , this aphid is relatively more successful than M. persicae. The high suitability of old leaves for M. persicae and, to a lesser extent, their low suitability for B. brassicae , are also apparent on turgid plants, in terms of reproduction, survival and the proportion of alate progeny. For M. persicae substrates which permit greater reproduction also promote fewer alatae but this is not always so for B. brassicae. However, crowding was not controlled in these experiments. It is suggested that these responses result from variation in the provision of the different nutritional and phagostimulant requirements of the two species by different leaf ages and during water stress. In the field irrigation may delay aphid multiplication during dry weather. ZUSAMMENFASSUNG REAKTIONEN VON MYZUS PERSICAE UND BREVICORYNE BRASSICAE AUF BLATTALTER UND WASSERMANGEL AN IN TÖPFEN GEZOGENEN KOHLPFLANZEN Die Reaktionen ungeflügelter Virginoparer von M. persicae und B. brassicae auf verschiedenes Blattalter von Kohlpflanzen ( Brassicae oleracea L. var. bullata gemmifera ) in Blumentöpfen mit verschiedener Wasserversorgung wurde an der Reproduktionsrate, der Entwicklungs‐ und Lebensdauer (des Adultstadiums, der Dauer der reproduktiven wie der post‐reproduktiven Phase) und der Geflügeltenbildung der Blattläuse untersucht. Dazu wurden zwei Formen des Wassermangels benutzt: (1) vorübergehender, bei welchem das verfügbare Wasser (AW) zwischen der Feldkapazität und einen im voraus festgelegten Defizit (10% = feucht, 50% = mäßig, 90% = trocken) schwankte, und (2) dauernder, bei welchem eine Abnahme des verfügbaren Wassers von einem bekannten Ausgangspunkt allmählich erfolgte. Obwohl für die Aphiden vorübergehender Wassermangel weitgehend vorteilhaft, beständiger aber schädlich ist, bestehen Unterschiede zwischen den Arten auf verschiedenaltrigen Blättern. Auf jungem und reifem Laub steigen Vermehrung und Lebensdauer beider Arten durch vorübergehenden Wassermangel an, aber auf alten Blättern Jeidet B. brassicae in dem Maße wie sich der Mangel verstärkt, während M. persicae bei mäßigem Mangel Vorteile hat und nur leidet, wenn periodisches Welken eintritt. Bei beiden Arten verursacht beständiger Wassermangel Hemmung der Reproduktion. Diese Abnahme beschleunigt sich bei Annäherung an den permanenten Welkepunkt (PWP) und war für die Aphiden auf alten Blättern am stärksten. Im Gegensatz zu M. persicae nimmt die Reproduktionsrate von B. brassicae sogar am permanenten Welkepunkt nicht ab. Die hohe Eignung alter Blätter für M. persicae und — in geringerem Maße — ihre geringe Eignung für B. brassicae waren auch an turgeszenten Pflanzen bei der Reproduktionsrate, der Überlebensdauer und dem Prozentsatz geflügelter Nachkommen deutlich festzustellen. Es wird vermutet, daß sich diese Reaktionen aus Verschiedenheiten in der Befriedigung unterschiedlicher nutritiver und phagostimulatorischer Bedürfnisse der beiden Arten auf verschieden alten Blättern und bei Wassermangel ergeben. Im Freien dürfte bei trockenem Wetter künstliche Bewässerung die Blattlausvermehrung verzögern.
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Claims 11
Claim · model-written summary
Intermittent water stress generally benefited reproduction and survival of Myzus persicae.
- Taxon
- Brussels sprouts
Brassica oleracea var. gemmiferae0 - Treatment
- intermittent water stresse0
- Interactor
- Myzus persicae
Myzus persicaee0pest - Outcome
- reproduction and survival of Myzus persicaee0
- Direction
- beneficiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intermittent water stress is largely beneficial and continuous water stress largely detrimental to the reproduction and survival of Myzus persicae and Brevicoryne brassicae feeding on Brussels sprouts”
Claim · model-written summary
Continuous water stress generally harmed reproduction and survival of Myzus persicae.
- Taxon
- Brussels sproutsBrassica oleracea var. gemmiferae0
- Treatment
- continuous water stresse0
- Interactor
- Myzus persicaeMyzus persicaee0pest
- Outcome
- reproduction and survival of Myzus persicaee0
- Direction
- detrimentale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intermittent water stress is largely beneficial and continuous water stress largely detrimental to the reproduction and survival of Myzus persicae and Brevicoryne brassicae feeding on Brussels sprouts”
Claim · model-written summary
Intermittent water stress generally benefited reproduction and survival of Brevicoryne brassicae.
- Taxon
- Brussels sproutsBrassica oleracea var. gemmiferae0
- Treatment
- intermittent water stresse0
- Interactor
- Brevicoryne brassicae
.jpg?width=60)
Brevicoryne brassicaee0pest - Outcome
- reproduction and survival of Myzus persicae and Brevicoryne brassicaee0
- Direction
- beneficiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“intermittent water stress is largely beneficial and continuous water stress largely detrimental to the reproduction and survival of Myzus persicae and Brevicoryne brassicae feeding on Brussels sprouts”
Claim · model-written summary
Continuous water stress generally harmed reproduction and survival of Brevicoryne brassicae.
- Taxon
- Brussels sproutsBrassica oleracea var. gemmiferae0
- Treatment
- continuous water stresse0
- Interactor
- Brevicoryne brassicaeBrevicoryne brassicaee0pest
- Outcome
- reproduction and survival of Myzus persicae and Brevicoryne brassicaee0
- Direction
- detrimentale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intermittent water stress is largely beneficial and continuous water stress largely detrimental to the reproduction and survival of Myzus persicae and Brevicoryne brassicae feeding on Brussels sprouts”
Claim · model-written summary
On old leaves under intermittent stress, M. persicae was more successful than B. brassicae.
- Taxon
- BRUSSELS SPROUTSBrassica oleracea var. gemmiferat0
- Organ / stage
- old leavese0
- Treatment
- intermittent water stresse0
- Interactor
- M. persicaeMyzus persicaee0pest
- Outcome
- relatively more successfule0
- Comparator
- B. brassicaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During intermittent water stress in the old leaves, the normal feeding stratum of M. persicae , this aphid is relatively more successful than B. brassicae”
t0“BRUSSELS SPROUTS”
Claim · model-written summary
On young leaves under continuous stress, B. brassicae was more successful than M. persicae.
- Taxon
- BRUSSELS SPROUTSBrassica oleracea var. gemmiferat0
- Organ / stage
- young leavese0
- Treatment
- continuous water stresse0
- Interactor
- B. brassicaeBrevicoryne brassicaee0pest
- Outcome
- relatively more successfule0
- Comparator
- M. persicaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During continuous water stress in the young leaves, the normal feeding stratum of B. brassicae , this aphid is relatively more successful than M. persicae”
t0“BRUSSELS SPROUTS”
Claim · model-written summary
Old leaves of turgid plants were more suitable for M. persicae reproduction, survival and alate progeny.
- Taxon
- BRUSSELS SPROUTSBrassica oleracea var. gemmiferat0
- Organ / stage
- old leavese0
- Interactor
- M. persicaeMyzus persicaee0pest
- Outcome
- high suitability of old leaves for M. persicaee0
- Qualifier
- turgid plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high suitability of old leaves for M. persicae and, to a lesser extent, their low suitability for B. brassicae , are also apparent on turgid plants, in terms of reproduction, survival and the proportion of alate progeny”
t0“BRUSSELS SPROUTS”
Claim · model-written summary
Old leaves of turgid plants were less suitable for B. brassicae.
- Taxon
- BRUSSELS SPROUTSBrassica oleracea var. gemmiferat0
- Organ / stage
- old leavese0
- Interactor
- B. brassicaeBrevicoryne brassicaee0pest
- Outcome
- low suitability for B. brassicaee0
- Qualifier
- turgid plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high suitability of old leaves for M. persicae and, to a lesser extent, their low suitability for B. brassicae , are also apparent on turgid plants, in terms of reproduction, survival and the proportion of alate progeny”
t0“BRUSSELS SPROUTS”
Claim · model-written summary
For M. persicae, substrates supporting more reproduction yielded fewer alatae.
- Taxon
- BRUSSELS SPROUTSBrassica oleracea var. gemmiferat0
- Organ / stage
- substratese0
- Interactor
- M. persicaeMyzus persicaee0pest
- Outcome
- fewer alataee0
- Direction
- fewere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For M. persicae substrates which permit greater reproduction also promote fewer alatae”
t0“BRUSSELS SPROUTS”
Claim · model-written summary
The reproduction and alate relationship did not always hold for B. brassicae.
- Taxon
- BRUSSELS SPROUTSBrassica oleracea var. gemmiferat0
- Interactor
- B. brassicaeBrevicoryne brassicaee0pest
- Outcome
- not always soe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but this is not always so for B. brassicae”
t0“BRUSSELS SPROUTS”
Claim · model-written summary
The authors suggest field irrigation may delay aphid multiplication in dry weather.
- Taxon
- BRUSSELS SPROUTSBrassica oleracea var. gemmiferat0
- Outcome
- irrigation may delay aphid multiplicatione0
- Qualifier
- dry weathere0
- Setting
- fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the field irrigation may delay aphid multiplication during dry weather”
t0“BRUSSELS SPROUTS”
The same questions in other papers
drought · Brevicoryne brassicae · Brassica oleracea (wild cabbage)Positive and negative results
1 reporting no difference from an alternative
- no effect
drought · Myzus persicae · Brassica oleracea (wild cabbage)Results agree
1 paper in the same direction as this paper
- 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.