VOL 25 *No.1http://www.pesting.org.rs/2010.phphttp://arhiva.nara.ac.rs/handle/123456789/12252023-04-24T02:22:51Z2023-04-24T02:22:51ZEffects of Sublethal Doses of Contact Insecticides on Offspring Production of Different Granary Weevil PopulationsKljajic, PetarPeric, Ilijahttp://arhiva.nara.ac.rs/handle/123456789/13552016-12-03T14:13:45ZEffects of Sublethal Doses of Contact Insecticides on Offspring Production of Different Granary Weevil Populations
Kljajic, Petar; Peric, Ilija
The effects of prior contact of granary weevil (Sitophilus granarius L.) parents from a laboratory
population, a Belgrade Port population (selected with LD70 pirimiphos-methyl) and
a Bijeljina population (selected with LD70 deltamethrin) with filter paper treated with sublethal
doses (LD20 and LD50) of the insecticides dichlorvos, malathion, chlorpyrifos-methyl,
pirimiphos-methyl and deltamethrin on offspring production of the surviving insects in F1
generation (after 10 weeks) and F2 generation (after 16 weeks) in untreated wheat grain was
examined under laboratory conditions.
Offspring reduction of laboratory weevils was highest at 96% in the F1 generation after
parents’ contact with LD50 dichlorvos, and lowest in F2 generation after contact with LD50
pirimiphos-methyl with 84% more insects than in the control. The highest offspring reduction
of selected weevils from Belgrade Port, 83%, was recorded in F1 generation after treatement
with LD50 dichlorvos and chlopyrifos-methyl, and the lowest in F1 and F2 generations
after contact with LD50 pirimiphos-methyl, around 44%. The highest offspring reduction of
the selected weevils from Bijeljina, 100%, was found in F1 and F2 generations after contact
with LD50 dichlorvos, malathion and deltamethrin, and the lowest again in F1 and F2 generations
after contact with LD20 chlorpyrifos-methyl, in which case insect numbers were
some 130% higher than in the control.
The results indicate that sublethal insecticide doses, apart from a significant decrease in
their efficacy against treated granary weevil populations, may also provoke an increase in
insect numbers in the following generations.; U laboratorijskim uslovima su ispitani efekti prethodnog kontakta adulta – roditelja žitnog
žiška (Sitophilus granarius L.) iz tri populacije: laboratorijske, Luke Beograd (selekcionisana
sa LD70 pirimifos-metila) i Bijeljine (selekcionisana sa LD70 deltametrina), sa filter-papirima
tretiranim subletalnim dozama (LD20 i LD50) insekticida dihlorvosa, malationa, hlorpirifos-
metila, pirimifos-metila i deltametrina, na produkciju potomstva preživelih jedinki u netretiranoj
pšenici u F1 (posle 10 nedelja) i F2 (posle 16 nedelja) generaciji.
Najveća redukcija potomstva laboratorijskih žižaka je zabeležena u F1 generaciji nakon
prethodnog kontakta adulta - roditelja sa LD50 dihlorvosa, 96%, a najslabija u F2 generaciji
posle kontakta sa LD50 pirimifos-metila, gde je u odnosu na kontrolu brojnost bila veća
84%. Najveća redukcija potomstva selekcionisanih žižaka iz Luke Beograd je zabeležena u
F1 generaciji prethodnim delovanjem LD50 dihlorvosa i hlorpirifos-metila, 83%, a najmanja
u F1 i F2 generaciji posle kontakta sa LD50 pirimifos-metila, oko 44%. Najveća redukcija potomstva
selekcionisanih žižaka iz Bijeljine zabeležena je u F1 i F2 generaciji posle prethodnog
kontakta žižaka sa LD50 dihlorvosa, malationa i deltametrina, 100%, a najmanja, takođe,
u F1 i F2 generaciji posle kontakta sa LD20 hlorpirifos-metila, gde je brojnost u odnosu na
kontrolu bila veća oko 130%.
Dobijeni rezultati pokazuju da subletalne doze insekticida, pored značajnog smanjenja
njihove efikasnosti u suzbijanju tretirane generacije žitnog žiška, mogu biti i uzročnici povećanja
brojnosti u budućim generacijama.
What Can Nutritional Indices Tell Us about Gypsy Moth Larvae (Lymantria dispar L.)?Andreeva, Elenahttp://arhiva.nara.ac.rs/handle/123456789/13542016-12-03T14:13:30ZWhat Can Nutritional Indices Tell Us about Gypsy Moth Larvae (Lymantria dispar L.)?
Andreeva, Elena
In the submitted work, important factors for planning out experiments for studying
nutritional indices, whose choice may affect research results, and opportunities for using
the indices of feeding to study the ecology of species are evaluated. The dependence of
nutritional indices on great many factors and significant variation in their absolute values
over different years make possible their research only as part of a complex issue together
with population factors and external conditions. A careful comparison of results from different
studies is made.; U priloženom radu ispitani su najpre faktori neophodni za planiranje eksperimenata za
proučavanje indeksa ishrane, čiji izbor može uticati na rezultate istraživanja, kao i mogućnosti
korišćenja indeksa ishrane u proučavanju ekologije vrste. Zavisnost indeksa ishrane od
većeg broja faktora i značajno variranje apsolutnih vrednosti u različitim godinama omogućavaju
istraživanje samo u sklopu populacionih faktora i uslova spoljašnje sredine. Sa pažnjom
je izvršeno poređenje rezultata iz različitih istraživanja.
Possible Influence of MLP Regulators in Foliage of Host Species on Invasion of Phyllophagous InsectsPonomarev, VasiliyShatalin, NikolayStrelskaya, TatianaKlobukov, Georgiyhttp://arhiva.nara.ac.rs/handle/123456789/13532016-12-03T14:13:15ZPossible Influence of MLP Regulators in Foliage of Host Species on Invasion of Phyllophagous Insects
Ponomarev, Vasiliy; Shatalin, Nikolay; Strelskaya, Tatiana; Klobukov, Georgiy
On the northern border of the Gypsy moth area (Lymantria dispar L., 1758), caterpillars
are reorient to exogenous regulators of membrane lipid peroxidation in connection with
repeated cold periods during feeding. In case of an introduction of host plants with high
contents of exogenous regulators of MLP (e.g. Fe2+) in foliage in these areas that may affect
diapause duration, the boundaries of spreading and intensity of outbreaks may change.; Na severnoj granici područja rasprostranjenja gubara (Lymantria dispar L., 1758), gusenice
se preorijentišu na egzogene regulatore peroksidacije lipada u membrani (MLP) u vezi
sa povremenim periodima zahlađenja tokom ishrane. U slučaju uvođenja biljaka domaćina
koje imaju povećane sadržaje egzogenih regulatora MLP (npr. Fe2+) u listovima, koji mogu
uticati na dužinu dijapauze, mogu se promeniti granice rasprostranjenja i intenzitet napada.
Naturally-Occurring Entomopathogenic Fungi on Three Bark Beetle Species (Coleoptera: Curculionidae) in BulgariaDraganova, SlavimiraTakov, DanailDoychev, Danailhttp://arhiva.nara.ac.rs/handle/123456789/13522016-12-03T14:12:48ZNaturally-Occurring Entomopathogenic Fungi on Three Bark Beetle Species (Coleoptera: Curculionidae) in Bulgaria
Draganova, Slavimira; Takov, Danail; Doychev, Danail
Bark beetles (Coleoptera: Curculionidae: Scolytinae) belong to one of the most damaging
groups of forest insects and the activity of their natural enemies – pathogens, parasitoids,
parasites or predators suppressing their population density, is of great importance.
Biodiversity of entomopathogenic fungi on bark beetles in Bulgaria has been investigated
sporadically. The aim of this preliminary study was to find, identify and study morphological
characteristics of fungal entomopathogens naturally-occurring in populations
of three curculionid species – Ips sexdentatus Boern, Ips typographus (L.) and Dryocoetes
autographus (Ratz.).
Dead pest adults were found under the bark of Pinus sylvestris and Picea abies trees collected
from forests in the Maleshevska and Vitosha Mountains. Fungal pathogens were
isolated into pure cultures on SDAY (Sabouraud dextrose agar with yeast extract) and
were identified based on morphological characteristics both on the host and in a culture.
Morphological characteristics of the isolates were studied by phenotypic methods.
The fungal isolates obtained from dead adults of Ips sexdentatus, Ips typographus and D.
autographus were found to belong to the species Beauveria bassiana (Bals. – Criv.) Vuillemin,
Beauveria brongniartii (Saccardo) Petch and Isaria farinosa (Holmsk.) Fries (anamorph
Ascomycota, Sordariomycetes: Hypocreales, Cordycipitaceae). Morphological traits of the
isolates are described.; Potkornjaci (Coleoptera: Curculionidae: Scolytinae) pripadaju jednoj od najštetnijih grupa
šumskih insekata, te je delovanje njihovih prirodnih neprijatelja, patogena, parazitoida,
parazita i predatora od velikog značaja.
Biodiverzitet entomopatogenih gljiva koje se javljaju kod potkornjaka u Bugarskoj malo
je istraživan. Cilj ovog početnog ispitivanja bio je da se pronađu, odrede i prouče morfološke
karakteristike gljiva kao entomopatogena koji se javljaju u prirodnim populacijama tri vrste
potkornjaka (Curculionidae) – Ips sexdentatus Boern, Ips typographus (L.) i Dryocoetes autographus
(Ratz.).
Uginuli adulti su prikupljeni ispod kore stabala Pinus sylvestris i Picea abies poreklom sa
planina Meleševska i Vitoša. Patogene gljive su izolovane kao čiste kulture na podlozi SDAY
(Sabouraud dextrose agar with yeast extract) i određene na osnovu morfoloških osobina
kako na domaćinu, tako i u kulturi. Morfološke osobine izolata proučavane su fenotipskim
metodama.
Izolati gljiva dobijeni sa uginulih adulta Ips sexdentatus, Ips typographus i D. autographus
pripadaju vrstama Beauveria bassiana (Bals.-Criv.) Vuillemin, Beauveria brongniartii (Saccardo)
Petch i Isaria farinosa (Holmsk.) Fries (anamorf Ascomycota, Sordariomycetes: Hypocreales,
Cordycipitaceae). Dat je opis morfoloških osobina izolata.