Resistenta rapsbaggar
Oilseed rape crops are an important in southern Sweden because of the high intensity of wheat growing. Pollen beetles are the most important pest in oilseed rape and causes often economic losses. Therefore it's of great importance that we can control the population density, e g by using insectici...
| Main Author: | |
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| Format: | L3 |
| Language: | Swedish Inglés |
| Published: |
SLU/Dept. of Landscape Architecture, Planning and Management (from 130101)
2004
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| Subjects: |
| _version_ | 1855571877576048640 |
|---|---|
| author | Tevell, Daniel |
| author_browse | Tevell, Daniel |
| author_facet | Tevell, Daniel |
| author_sort | Tevell, Daniel |
| collection | Epsilon Archive for Student Projects |
| description | Oilseed rape crops are an important in southern Sweden because of the high intensity
of wheat growing. Pollen beetles are the most important pest in oilseed rape and
causes often economic losses. Therefore it's of great importance that we can control
the population density, e g by using insecticides if necessary, to avoid mayor yield
losses.
In year 2000 pollen beetles were numerous in the province of Östergötland. The
farmers sprayed with insecticides several times, but with low effects on the beetles.
Field trials and laboratory experiments showed that pollen beetles had developed
resistance against pyrethroids. Between 2001 and 2003 several field trials were laid
out in Östergötland to investigate pollen beetle mortality from different groups of
insecticides.
The results shows that only the highest recommended dose (72 g/ha) of tau-fluvalinat
and OP-compounds had acceptable effects on pollen beetles, giving more than 80 %
mortality. It might seem strange that tau-fluvalinat had good effects, because it's also
a pyrethroide. There is no explanation for this.
Inventories among 32 farmers in Östergötland indicate that 78 % of the treatments
were made with tau-fluvalinat and 22 % with OP-compounds. The widespread use of
tau-fluvalinate has resulted in the first indications of resistance also against this
insecticide.
Interviews with farm advisers in mayor agricultural districts were held to find out
what kind of treatments against pollen beetles they recommended next year to their
farmers and how to minimize the risk of more problems with resistance.
Recommendations are not to grow spring- and winter oilseed rape crops in the same
area, to use winter oilseed rape crops instead of spring varieties and only to use the
highest recommended dose. These recommendations will lead to fewer treatments and
therefore less risk of resistance development against insecticides. |
| format | L3 |
| id | RepoSLU11460 |
| institution | Swedish University of Agricultural Sciences |
| language | swe Inglés |
| publishDate | 2004 |
| publishDateSort | 2004 |
| publisher | SLU/Dept. of Landscape Architecture, Planning and Management (from 130101) |
| publisherStr | SLU/Dept. of Landscape Architecture, Planning and Management (from 130101) |
| record_format | eprints |
| spelling | RepoSLU114602017-10-04T13:07:44Z Resistenta rapsbaggar Resistant pollen beetles Tevell, Daniel rapsbaggar oljeväxter växtskydd Oilseed rape crops are an important in southern Sweden because of the high intensity of wheat growing. Pollen beetles are the most important pest in oilseed rape and causes often economic losses. Therefore it's of great importance that we can control the population density, e g by using insecticides if necessary, to avoid mayor yield losses. In year 2000 pollen beetles were numerous in the province of Östergötland. The farmers sprayed with insecticides several times, but with low effects on the beetles. Field trials and laboratory experiments showed that pollen beetles had developed resistance against pyrethroids. Between 2001 and 2003 several field trials were laid out in Östergötland to investigate pollen beetle mortality from different groups of insecticides. The results shows that only the highest recommended dose (72 g/ha) of tau-fluvalinat and OP-compounds had acceptable effects on pollen beetles, giving more than 80 % mortality. It might seem strange that tau-fluvalinat had good effects, because it's also a pyrethroide. There is no explanation for this. Inventories among 32 farmers in Östergötland indicate that 78 % of the treatments were made with tau-fluvalinat and 22 % with OP-compounds. The widespread use of tau-fluvalinate has resulted in the first indications of resistance also against this insecticide. Interviews with farm advisers in mayor agricultural districts were held to find out what kind of treatments against pollen beetles they recommended next year to their farmers and how to minimize the risk of more problems with resistance. Recommendations are not to grow spring- and winter oilseed rape crops in the same area, to use winter oilseed rape crops instead of spring varieties and only to use the highest recommended dose. These recommendations will lead to fewer treatments and therefore less risk of resistance development against insecticides. Oljeväxtodlingen är ett viktigt inslag i dagens växtodling på Sveriges slättbyggder. Den utgör en utmärkt avbrottsgröda som ger goda förfruktsvärden på gårdar med ensidig växtföljd. Problemet med svårbekämpade rapsbaggar uppdagades under år 2000 i Östergötland. Efter flera fält- och laboratorieförsök visade det sig att rapsbaggarna var resistenta mot pyretroider. Som ett led i detta har Växtskyddcentralen under de tre senaste åren, 2001-2003, årligen utfört tre stycken försök i västra Östergötland. Samtliga dessa försök har varit i områden där man misstänker att det finns pyretroidresistens. Försökens syfte var att undersöka olika preparats behandlingseffekt på rapsbaggar i oljeväxter. Sammanställningen av försöken visade att bara Mavrik(tau-fluvalinat) med full dos (0,3 l/ha) och Sumithion(fenitrotion), som är en organisk fosforsyra, har acceptabel bekämpningseffekt över 80 %. Resultatet kan tyckas märkligt eftersom att Mavrik är en pyretroid. Varför preparatet fungerar trots resistens vet man inte. Det finns i dagsläget inga andra preparat på marknaden som fungerar tillfredställande i områden med utbredd resistens. En inventering i Östergötland år 2003 visade att alla bekämpningar mot rapsbaggar utförts med Mavrik eller Sumithion. Utav behandlingarna var 78 % utförda med Mavrik. Den stora användningen av preparatet har resulterat i de första indikationerna på resistens även mot Mavrik. En rundringning bland rådgivare i de södra odlingsområdena visar att alla är medvetna om problemen. Några av de åtgärder man rekommenderar sina odlare är att följa bekämpningströsklarna, inte odla höst- och våroljeväxter i samma område, så höstoljeväxter istället för våroljeväxter. Samtliga åtgärder resulterar i minskat antal behandlingar vilket motverkar ökad resistens. SLU/Dept. of Landscape Architecture, Planning and Management (from 130101) 2004 L3 swe eng https://stud.epsilon.slu.se/11460/ |
| spellingShingle | rapsbaggar oljeväxter växtskydd Tevell, Daniel Resistenta rapsbaggar |
| title | Resistenta rapsbaggar |
| title_full | Resistenta rapsbaggar |
| title_fullStr | Resistenta rapsbaggar |
| title_full_unstemmed | Resistenta rapsbaggar |
| title_short | Resistenta rapsbaggar |
| title_sort | resistenta rapsbaggar |
| topic | rapsbaggar oljeväxter växtskydd |