Abstract
Abstract The population dynamics of the saddle gall midge, Haplodiplosis marginata (von Roser) (Dipt., Cecidomyiidae) on fields of wheat grown for one year, for two successive years, and continuously for more than 20 years On fields of winter wheat in Lower Saxony, the abundance of saddle gall midge larvae in only one of two years was higher when winter wheat was the previous crop rather than sugar beets. In the other year the abundance was similar in both systems of crop rotations. The population dynamics of the saddle gall midge was studied in Schleswig‐Holstein from 1975 to 1985 on a plot whit wheat grown continuously since 1955. Two outbreaks occurred in these 11 years, a “latent” phase of 5 years being between. In spite of an optimal supply with host plants, the population of the saddle gall midge increased from one generation (year) to the next by the factor 5.7 at maximum. Rainfalls in July, host plant supply, and parasites had a certain effect on the population dynamics of the midge. But the “key factor” has not been found yet. In spite of this, to prevent outbreaks of the saddle gall midge, close cereal cropping should be avoided. Zusammenfassung In Niedersachsen wurde auf Winterweizenfeldern geprüft, ob die Abundanz der Sattelmücke, Haplodiplosis marginata (von Roser), beim Anbau von Winterweizen nach Winterweizen stets höher ist als beim Anbau nach Zuckerrüben. Dies war nur in einem von zwei Untersuchungsjahren der Fall. In Schleswig‐Holstein konnte die Abundanzdynamik der Sattelmücke von 1975 bis 1985 auf einer Parzelle verfolgt werden, auf der seit 1955 kontinuierlich Weizen angebaut wurde (von 1973 bis 1985 Sommerweizen “Kolibri”). Bei Dauerweizenanbau waren innerhalb der 11 Jahre 2 typische Gradationen, Retrogradationen und eine Latenzphase von 5 Jahren zu beobachten. Trotz optimalen Wirtspflanzenangebots vermehrte sich die Sattelmückenpopulation von einer Generation zur anderen maximal nur um den Faktor 5,7. In Übereinstimmung mit anderen Autoren konnte gezeigt werden, daß die Niederschläge (im Juli), das Wirtspflanzenangebot und die Parasiten eine gewisse Bedeutung für das Auftreten der Sattelmücke haben. Keiner dieser Faktoren kann aber eine Massenvermehrung der Sattelmücke auslösen. Der “Schlüsselfaktor” der Populationsdynamik der Sattelmücke ist demnach noch nicht bekannt. Zur Vermeidung von Massenvermehrungen der Sattelmücke sollten aber vorbeugend alle Maßnahmen ergriffen werden, die Insektizideinsätze vermeidbar erscheinen lassen, wie z. B. die Einhaltung einer möglichst weit gestellten Fruchtfolge.
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Claims 6
Claim · model-written summary
In one of two years, saddle gall midge larvae were more abundant when winter wheat followed winter wheat than when it followed sugar beets.
- Taxon
- winter wheat
Triticum aestivume0 - Treatment
- winter wheat was the previous crope0
- Interactor
- saddle gall midgee0pest
- Outcome
- abundance of saddle gall midge larvaee0
- Direction
- highere0
- Comparator
- sugar beetse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the abundance of saddle gall midge larvae in only one of two years was higher when winter wheat was the previous crop rather than sugar beets”
Claim · model-written summary
In the other year, saddle gall midge abundance was similar in both crop rotation systems.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- crop rotationse1
- Interactor
- saddle gall midgee0pest
- Outcome
- abundancee1
- Direction
- was similare1
- Comparator
- sugar beetse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the abundance of saddle gall midge larvae in only one of two years was higher when winter wheat was the previous crop rather than sugar beets”
e1“In the other year the abundance was similar in both systems of crop rotations”
Claim · model-written summary
On continuous wheat the saddle gall midge population increased by a factor of 5.7 at most from one generation to the next despite optimal host supply.
- Taxon
- wheatTriticum aestivume6
- Interactor
- saddle gall midgee6pest
- Outcome
- population of the saddle gall midgee2
- Direction
- increasede2
- Value
- factor 5.7e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“the population of the saddle gall midge increased from one generation (year) to the next by the factor 5.7 at maximum”
e6“The population dynamics of the saddle gall midge was studied in Schleswig‐Holstein from 1975 to 1985 on a plot whit wheat grown continuously since 1955”
Claim · model-written summary
Rainfall in July, host plant supply and parasites had a certain effect on saddle gall midge population dynamics in wheat.
- Taxon
- wheatTriticum aestivume6
- Treatment
- Rainfalls in July, host plant supply, and parasitese3
- Interactor
- saddle gall midgee6pest
- Outcome
- population dynamics of the midgee3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Rainfalls in July, host plant supply, and parasites had a certain effect on the population dynamics of the midge”
e6“The population dynamics of the saddle gall midge was studied in Schleswig‐Holstein from 1975 to 1985 on a plot whit wheat grown continuously since 1955”
Claim · model-written summary
To prevent saddle gall midge outbreaks, close cereal cropping should be avoided.
Verbatim
e4“to prevent outbreaks of the saddle gall midge, close cereal cropping should be avoided”
Claim · model-written summary
Two saddle gall midge outbreaks occurred in 11 years of continuous wheat cropping in Schleswig-Holstein.
- Taxon
- wheatTriticum aestivume6
- Outcome
- outbreakse5
- Setting
- Schleswig‐Holsteine6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Two outbreaks occurred in these 11 years”
e6“The population dynamics of the saddle gall midge was studied in Schleswig‐Holstein from 1975 to 1985 on a plot whit wheat grown continuously since 1955”
The same questions in other papers
rotation · pest · Triticum aestivum (wheat)Positive and negative results
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See all 18 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.