Search results for "Insect Science"
showing 10 items of 1011 documents
An annotated checklist of burrower bugs (Hemiptera: Heteroptera: Cydnidae) from Bali (Indonesia) with new records*
2015
Abstract An annotated checklist of the Balinese Cydnidae is provided. Three species (Chilocoris adelphus, Macroscytus dominiqueae, M. javanus) are recorded for the first time from Bali, including the first Indonesian record for M. dominiqueae. Fromundus pygmaeus is recorded for the second time from the island. Our study increases the number of Cydnidae recorded from Bali to seven, and that known from Indonesia to 58.
Effects of azadirachtin on reproduction and egg development of the heteropteranOncopeltus fasciatusDallas
1986
Azadirachtin injected into newly hatched adults of Oncopeltus fasciatus affected longevity, fecundity and hatchability of eggs from treated parents. There were marked differences between males and females. Whereas mortality was higher in females, reproduction was interrupted at lower doses in males: 0.125 μg caused impotency. Topical treatment of normal eggs had no demonstrable effect on egg hatch. The studies showed that in respect to a possible use of azadirachtin in insect pest managment, the interruption of reproduction and adult development is of no less importance then growth interruption in larvae (Dorn et al. 1986). Zusammenfassung Die Wirkung von Azadirachtin auf Reproduktion und E…
Diversity and Community Structure of Opiinae (Hymenoptera: Braconidae) in the Forest Estate of Artikutza (Spain)
2011
ABSTRACT The present work analyses the diversity of Opiinae (Hymenoptera: Braconidae) in the forest of the Artikutza Estate, within the Natural Park, Penas de Aya, in the western Pyrenees. Specimens belonging to this subfamily were collected throughout two cycles and in two different habitats: mixed forest and beech forest. A total of 105 specimens, including 20 different species, were collected. Diversity and structure analysis indicated higher diversity for the beech forest habitat, although the community is composed of a few abundant species and many rare species. A relationship between the presence of Opiinae and an increase in temperature was also ascertained.
THREE NEW SPECIES OF CHOREBUS FROM SPAIN (HYMENOPTERA: BRACONIDAE: ALYSIINAE)
2002
Chorebus affiniformis, C. dentisignatus and C. granulosus, three species of Dacnusini from Spain, are described as new and are compared with allied species of the genus. Keys for their discrimination are provided.
Revision of the Asian species of genus Xyalaspis Hartig, 1843 (Hymenoptera: Figitidae: Anacharitinae)
2014
A revision of genus Xyalaspis (Hymenoptera: Anacharitinae) in Asia is given. Xyalaspis lituricis Belizin, 1965 is synonymized with Xyalaspis hyalina Belizin, 1951. Four new species are described: Xyalaspis esbelta n. sp., Xyalaspis dimorphica n. sp., Xyalaspis orientalis n. sp., and Xyalaspis siamensis n. sp. Diagnostic characters are illustrated and data about biology, distribution and morphological variability of the studied species are discussed. A key to the Asian species of this genus is included.
First record of the genus Syncrasis in Spain, with а redescription of Syncrasis (Eusyncrasis) talitzkii Tobias, 1986 (Hymenoptera: Braconidae: Alysii…
2011
The genus Syncrasis Foerster, 1862 as subgenus Eusyncrasis Tobias, 1986 is recorded for the first time in the fauna of Spain. A key to subgenera, and a detailed redescription of Syncrasis (Eusyncrasis) talitzkii Tobias, 1986 on the basis of Spanish material collected by а Malaise trap in the Alicante Province, are provided.
Interspecific extrinsic and intrinsic competitive interactions in egg parasitoids
2012
Interspecific competitive interactions can occur either between adult parasitoids searching/exploiting hosts (extrinsic competition) or between parasitoid larvae developing within the same host (intrinsic competition). Understanding how interspecific competition between parasitoids can affect pest suppression is important for improving biological pest control. The purpose of this work was to review both extrinsic and intrinsic competition between egg parasitoid species. These are organisms that are often candidates for biological control programs due to their ability to kill the pest before the crop feeding stage. We first reviewed the literature about interspecific competitive abilities of…
The ovipositing female of Ooencyrtus telenomicida relies on physiological mechanisms to mediate intrinsic competition with Trissolcus basalis
2012
Ongoing studies by our group showed that the outcome of the intrinsic competition between two solitary egg parasitoids, Trissolcus basalis (Wollaston) (Hymenoptera: Scelionidae) and Ooencyrtus telenomicida (Vassiliev) (Hymenoptera: Encyrtidae), is dominated by O. telenomicida. In this article we investigated the role played by the ovipositing O. telenomicida female in the suppression of a T. basalis competitor. Laboratory experiments were conducted by allowing an O. telenomicida female to puncture the eggs of Nezara viridula (L.) (Heteroptera: Pentatomidae) with her ovipositor (= no oviposition) or to parasitize them. The results show that O. telenomicida relies on some physiological mechan…
Metarhizium anisopliae, a potential agent for the control of grape phylloxera
2004
This investigation deals with the control effects of the insect pathogenic fungus Metarhizium anisopliae var. anisopliae on Daktulosphaira vitifoliae. In pot experiments, the soil surrounding phylloxera-infected grapes was inoculated with barley colonised with M. anisopliae. After thirty-two days, ineight of ten Metarhizium-applied pots nofresh phylloxera infections could be observed.In two of ten plants, a few fresh nodositiessingly occupied with phylloxera or phylloxeraeggs could be found. In all untreated plants,fresh nodosities with either single (two of sixplants) or multiple (four of six plants)occupation with phylloxera could be observed.M. anisopliae could be re-isolated in aconcent…