Title
Demographic analysis of acaricide effects on the two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae)
Creator
Musa, Asma M., 1978-
CONOR:
110590217
Copyright date
2023
Object Links
Select license
Autorstvo-Nekomercijalno-Bez prerade 3.0 Srbija (CC BY-NC-ND 3.0)
License description
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Language
Serbian
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 07.03.2024.
Other responsibilities
Academic Expertise
Prirodno-matematičke nauke
Academic Title
-
University
Univerzitet u Beogradu
Faculty
Biološki fakultet
Alternative title
Demografska analiza efekata akaricida na običnog paučinara, Tetranychus urticae Koch (Acari: Tetranychidae)
Publisher
[A. M. Musa]
Format
71 str.
description
biology - entomology, acarology, plant protection / biologij - entomologija, akarologija, zaštita bilja
Abstract (en)
The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is a polyphagous and cosmopolitan species that attacks a number of agricultural crops, especially in greenhouses. The effects of acaricides hexythiazox and spirodiclofen on life history traits and population parameters of the F0 and F1 generationss of T. urticae, following the treatment of F0 eggs and pre-ovipositing females, were evaluated in laboratory bioassays using the age-stage two-sex life table (in fecundity- and fertility-based variants). Hexythiazox caused a short-lived transovarial toxic effect on the eggs laid by treated females (i.e. reduced their fertility), and this effect was decisive for significant reduction in the population growth rates in both generations. Spirodiclofen reduced the population growth rates mainly due to sterilization of treated females and their high mortality in the initial period of oviposition, in combination with reduced fecundity and longevity of reproductive females. Its transovarial toxicity was not sufficient to cause a significant reduction in the population growth of the F0 generation, but contributed to population growth reduction in the F1 generation. Ovicidal action of the acaricides, following the egg treatment, had a decisive contribution to reduction in the population growth rates of the F0 generation. In the F1 generation, shortening of development time compensated fecundity and longevity reductions. Considering the range of concentrations of hexathiazox and spirodiclofen causing significant reduction in the population growth rates of T. urticae, it can be concluded that the impact of the former is stronger than that of the latter. These results are discussed in the context of population biology of T. urticae as well as its management.
Abstract (sr)
Obični paučinar, Tetranychus urticae Koch (Acari: Tetranychidae), polifagna je i kosmopolitska vrsta grinje koja napada veliki broj poljoprivrednih kultura, posebno u staklenicima i plastenicima. Efekti akaricida heksitiazoksa i spirodiklofena na osobine životne istorije i populacione parametre F0 i F1 generacija T. urticae, nakon tretiranja F0 jaja i pre-ovipozicionih ženki, ocenjivani su u laboratorijskim biotestovima primenom starosno-razvojnih tabela života oba pola (u varijantama zasnovanim na fekunditetu i fertilitetu). Heksitiazoks je uzrokovao kratkotrajni transovarijalni toksični efekat na jaja koja su polagale tretirane ženke (tj. redukovao je njihov fertilitet), i ovaj efekat je bio odlučujući za značajnu redukciju stopa populacionog rasta obe generacije. Spirodiclofen je redukovao stope populacionog rasta uglavnom zahvaljujući sterilizaciji tretiranih ženki i njihovoj visokoj smrtnosti u početnom periodu ovipozicije, u kombinaciji sa redukcijom fekunditeta i dužine života reproduktivnih ženki. Njegova transovarijalna toksičnost nije bila dovoljna za značajnu redukciju stopa populacionog rasta F0 generacije, ali je doprinela redukciji populacionog rasta F1 generation. Ovicidno delovanje oba akaricida, nakon direktnog tretiranja jaja, bilo je odlučujuće za redukciju populacionog rasta F0 generation. Skraćenje vremena razvića u F1 generaciji kompenzovalo je redukciju fekunditeta i dužine života. Uzimajući u obzir opseg koncentracija oba akaricida koje uzrokuju značajnu redukciju stopa populacionog rasta T. urticae, može se zaključiti da je učinak heksitiazoksa jači od učinka spirodiklofena. Dobijeni rezultati razmotreni su u kontekstu populacione biologije T. urticae kao i njenog suzbijanja.
Authors Key words
T. urticae, acaricides, sublethal effects, life tables, spirodiclofen, hexythiazox
Authors Key words
T. urticae, acaricidi subletalni efekti, tabele života, spirodiklofen, heksitiazoks
Classification
595.42:632.951(043.3)
Type
Tekst
Abstract (en)
The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is a polyphagous and cosmopolitan species that attacks a number of agricultural crops, especially in greenhouses. The effects of acaricides hexythiazox and spirodiclofen on life history traits and population parameters of the F0 and F1 generationss of T. urticae, following the treatment of F0 eggs and pre-ovipositing females, were evaluated in laboratory bioassays using the age-stage two-sex life table (in fecundity- and fertility-based variants). Hexythiazox caused a short-lived transovarial toxic effect on the eggs laid by treated females (i.e. reduced their fertility), and this effect was decisive for significant reduction in the population growth rates in both generations. Spirodiclofen reduced the population growth rates mainly due to sterilization of treated females and their high mortality in the initial period of oviposition, in combination with reduced fecundity and longevity of reproductive females. Its transovarial toxicity was not sufficient to cause a significant reduction in the population growth of the F0 generation, but contributed to population growth reduction in the F1 generation. Ovicidal action of the acaricides, following the egg treatment, had a decisive contribution to reduction in the population growth rates of the F0 generation. In the F1 generation, shortening of development time compensated fecundity and longevity reductions. Considering the range of concentrations of hexathiazox and spirodiclofen causing significant reduction in the population growth rates of T. urticae, it can be concluded that the impact of the former is stronger than that of the latter. These results are discussed in the context of population biology of T. urticae as well as its management.
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