Other insects

Fipronil blamed for historical bee deaths

Researchers in the UK report new evidence that the pesticide fipronil, not the neonicotinoid imidacloprid, caused a massive die-off of honey bees in France from 1994 to 1998. Both pesticides hit the market in the early 1990s. At the time, beekeepers and environmentalists largely blamed imidacloprid for the bee deaths. Now, Philippa Holder and colleagues at the University of Exeter and Fera Science, a UK public-private venture focused on agricultural science, suggest that fipronil used on sunflowers was more likely the culprit (Proc. Natl. Acad. Sci. U.S.A.

Pestizide sind Hauptursache des Insektensterbens

Auf Einladung des Bund für Umwelt und Naturschutz Deutschland (BUND) referierte der Insektenforscher Thomas Hörren vom Entomologischen Verein Krefeld (EVK) im Möllner Quellenhof vor 90 Besuchern über deren bahnbrechende Studie zum Thema “Rückgang der Insekten-Biodiversität”. An zahlreichen Standorten ausschließlich in Schutzgebieten hatte der EVK 27 Jahre lang die Insektenfauna untersucht. Aufgrund des enormer Datenbestand und der wissenschaftlichen Methodik waren die Entomologen in der Lage, nicht nur den schleichenden Verlust an Arten, sondern auch an Insekten-Biomasse zu dokumentieren.

Oorzaken van de achteruitgang van natuur en landschap in Noordoost Twente

N.a.v. de gemeenteraadsverkiezingen van 21 maart 2018 informeerde de werkgroep Behoud Twents Landschap de Twentse bevolking over de stand van zaken van natuur en landschap in Noordoost Twente. Hieronder een aantal feiten en constateringen:

1. Hoogleraar Siepel: ‘Twentse bodemfauna zo dood als een pier’

De bodemfauna op het platteland in Twente is nagenoeg verdwenen. Dat zegt Henk Siepel, hoogleraar dierecologie aan de Radboud Universiteit. “Het ziet er groen uit, maar het is zo dood als een pier.”

2. Onze insecten sterven massaal.

Massive reductions in arthropod abundance in Puerto Rico’s rainforest are indirectly precipitating a collapse of the forest food web

Arthropods, invertebrates including insects that have external skeletons, are declining at an alarming rate. While the tropics harbor the majority of arthropod species, little is known about trends in their abundance. We compared arthropod biomass in Puerto Rico’s Luquillo rainforest with data taken during the 1970s and found that biomass had fallen 10 to 60 times. Our analyses revealed synchronous declines in the lizards, frogs, and birds that eat arthropods.

At long last American entomologists start to realize that insect decline is a general problem

A staple of summer – swarms of bugs – seems to be a thing of the past. And that’s got scientists worried. Pesky mosquitoes, disease-carrying ticks, crop-munching aphids and cockroaches are doing just fine. But the more beneficial flying insects of summer – native bees, moths, butterflies, ladybugs, lovebugs, mayflies and fireflies – appear to be less abundant. Scientists think something is amiss, but they can’t be certain: In the past, they didn’t systematically count the population of flying insects, so they can’t make a proper comparison to today.

Pesticide levels above the set EU standard in four Irish water supplies

Four water supplies, one in Kilkenny, two in Limerick and one in Longford currently have a level of pesticides above the set EU standard, according to Irish Water. The pesticide that is being detected most frequently in drinking water supplies in Ireland is an herbicide called MCPA. This herbicide is in many products used to control thistle, dock and rush. This increase is because products containing MCPA are being used to control weeds on hard surfaces, in gardens, on farms or in forestry.

Neonicotinoid Residues in Nectar and Foliage of Systemically Treated Woody Landscape Plants

We measured uptake and dissipation of soil-applied imidacloprid and dinotefuran in nectar and leaves of 2 woody plant species, a broadleaf evergreen tree (Ilex attenuata) and a deciduous shrub (Clethra alnifolia), to assess concentrations to which pollinators and pests might be exposed in landscape settings. Three application timings, autumn (postbloom), spring (prebloom), and summer (early postbloom), were evaluated to see if taking advantage of differences in the neonicotinoids’ systemic mobility and persistence might enable pest control while minimizing transference into nectar.

Seit dem Jahr 2000 ist die Zahl der Käfer stark gesunken in der Bundesrepublik

Das Insektensterben in der Bundesrepublik hat besorgniserregende Ausmaße erreicht. „Eine aktuelle Studie bestätigt den Rückgang der Biomasse fliegender Insekten um 75 Prozent“, sagt der Greifswalder Zoologieprofessor Michael Schmitt. Es betrifft nicht nur die Bienen, über die in jüngster Zeit viel diskutiert wurde, sondern auch viele andere Arten. In den Jahren 1990 bis 2017 sind 63 Arten und zehn Unterarten der Blatt- und Samenkäfer wahrscheinlich in Mitteleuropa ausgestorben. Denn es gibt keine Nachrichten über ihr Auftreten in der Datenbank CryFaun mehr.

Alarm over toxic pesticide sprayed on Scotland’s woodlands

Scotland’s forests are treated and sprayed every year with hundreds of kilograms of a toxic pesticide blamed for killing bees and butterflies, The Ferret can reveal. Our investigation has uncovered widespread use of the nicotine-based insecticide, acetamiprid, by the forestry industry, provoking concerns from experts and alarm from environmentalists who fear “creeping degradation” of nature.