The impact of insecticides applications on the parassitation and mortality of pollen beetle larvae in winter oilseed rape buds (Brassica napus L.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26791251%3A_____%2F22%3AN0000066" target="_blank" >RIV/26791251:_____/22:N0000066 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/26784246:_____/22:N0000051

Výsledek na webu

<a href="http://iobc-wprs.org" target="_blank" >http://iobc-wprs.org</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The impact of insecticides applications on the parassitation and mortality of pollen beetle larvae in winter oilseed rape buds (Brassica napus L.

Popis výsledku v původním jazyce

In 2021 was carried out the trial that focused on the degree of parasitization of pollen beetle larvae. In the study were 17 insecticide treatments in four replicates were tested. Twenty inflorescences oilseed were collected from each plot. Inflorescences were immediately frozen after sampling from plots (25 m2/one plot) and later the pollen beetle larvae were analyzed in the laboratory. Assessments were the number of flowers per inflorescence, the number of larvae in each flower, the number of flowers damaged by larvae and the number of larvae in inflorescence (analyzed 16,000 specimens). The number of parasitoid larvae and the number of eggs in larval individuals were determined by dissection with usage a binocular microscope. The assessments in field plots were repeated 3 days, 5 days, 7 days after the application of insecticides. The results of this trial demonstrate the efficacy of insecticides on pollen beetle larvae and their impacts on parasitization. Mostly, the registered doses of pyrethroids were used (lambda-cyhalothrin, gamma-cyhalothrin, cypermethrin, alpha-cypermethrin, zeta-cypermethrin, deltamethrin, tau-fluvalinate, etofenprox, esfenvalerate, indoxacarb), two neonicotinoids (thiacloprid, acetamiprid) and other products consired to be ecologicall (spinetoram, spinosad, azadirachtin and orange oil). Monitoring with yellow water traps during the whole season showed the most frequent parasitoid of the pollen beetle is Tersilochus heterocerus (Tersilochinae, Hymenoptera) around city Šumperk, Czechia (parasitation 25-98%). Neonicotinoids with systemic efficacy significantly reduced the number of larvae and at the same time reduced the level of its parasitation. However, a „ecological produkt” - "Radiant" (spinetoram), has not negative effect on the parasitation and reduce the number of larvae too, showed a potential to decrease an abundance of pollen beetles in next season. Etheric pyrethroids did not reduce the number of larvae in the flowers at all.

Název v anglickém jazyce

The impact of insecticides applications on the parassitation and mortality of pollen beetle larvae in winter oilseed rape buds (Brassica napus L.

Popis výsledku anglicky

In 2021 was carried out the trial that focused on the degree of parasitization of pollen beetle larvae. In the study were 17 insecticide treatments in four replicates were tested. Twenty inflorescences oilseed were collected from each plot. Inflorescences were immediately frozen after sampling from plots (25 m2/one plot) and later the pollen beetle larvae were analyzed in the laboratory. Assessments were the number of flowers per inflorescence, the number of larvae in each flower, the number of flowers damaged by larvae and the number of larvae in inflorescence (analyzed 16,000 specimens). The number of parasitoid larvae and the number of eggs in larval individuals were determined by dissection with usage a binocular microscope. The assessments in field plots were repeated 3 days, 5 days, 7 days after the application of insecticides. The results of this trial demonstrate the efficacy of insecticides on pollen beetle larvae and their impacts on parasitization. Mostly, the registered doses of pyrethroids were used (lambda-cyhalothrin, gamma-cyhalothrin, cypermethrin, alpha-cypermethrin, zeta-cypermethrin, deltamethrin, tau-fluvalinate, etofenprox, esfenvalerate, indoxacarb), two neonicotinoids (thiacloprid, acetamiprid) and other products consired to be ecologicall (spinetoram, spinosad, azadirachtin and orange oil). Monitoring with yellow water traps during the whole season showed the most frequent parasitoid of the pollen beetle is Tersilochus heterocerus (Tersilochinae, Hymenoptera) around city Šumperk, Czechia (parasitation 25-98%). Neonicotinoids with systemic efficacy significantly reduced the number of larvae and at the same time reduced the level of its parasitation. However, a „ecological produkt” - "Radiant" (spinetoram), has not negative effect on the parasitation and reduce the number of larvae too, showed a potential to decrease an abundance of pollen beetles in next season. Etheric pyrethroids did not reduce the number of larvae in the flowers at all.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

40106 - Agronomy, plant breeding and plant protection; (Agricultural biotechnology to be 4.4)

Projekt

<a href="/cs/project/QK21010332" target="_blank" >QK21010332: Mechanismus rezistence řepkových škůdců proti insekticidům, jejich výchozí citlivost k novým insekticidům a dopad insekticidních aplikací na vývoj larev škůdců a jejich přirozených nepřátel.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů