Search results for "Lygaeidae"
showing 7 items of 7 documents
Orsillus depressus (Mulsant & Rey, 1852) (Hemiptera: Heteroptera: Lygaeidae) – pierwsze stwierdzenie na Dolnym Śląsku
2016
[Orsillus depressus (Mulsant & Rey, 1852) (Heteroptera: Lygaeidae) – first record in Lower Silesia]. This note presents the first record of Orsillus depressus in Lower Silesia (south-west Poland
<strong>Identification of the nymphal stages of two European seed bugs, <em>L. equestris</em> and <em>L. simulans</em> …
2013
The genus Lygaeus Fabricius, 1794 includes more than fifty species, mainly distributed in the Old World regions, with 17 species known from the Palearctic (Pericart 2001; Wachmann et al. 2007), and only two from Central Europe, i.e., L . equestris (Linnaeus, 1758) and L . simulans Deckert, 1985 (Pericart 2001).
Ecdysteroid-dependent larval-adult oviduct transformation in the milkweed bugOncopeltus fasciatus requires absence of juvenile hormone
1987
It has been tested whether juvenile hormone plays a role in the larval-adult transformation of lateral oviducts in the milkweed bug. The transformation is ecdysteroid-dependent, as was reported previously2. Application of precocene or juvenile hormone III proved that the absence of juvenile hormone is required.
Cadmium effects on development and reproduction of Oncopeltus fasciatus (Heteroptera: Lygaeidae)
2004
Newly hatched nymphs of the insect Oncopeltus fasciatus were exposed to various concentrations of CdCl2 administered in drinking water until the end of adult life. Significant nymphal mortalities were observed at concentrations above 30 mg Cd/l (corresponding to the LC50). The duration of the nymphal stages increased in proportion to the Cd concentration; at the lowest Cd concentration of 10 mg Cd/l, the median duration was significantly prolonged by one day, while at the highest concentration of 100 mg Cd/l it was increased by 10 days over the control group. The weight of newly emerged adults lineally decreased with Cd concentration, being reduced to half the weight of controls at 100 mg C…
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…
Ovicidal Activity of Maternally Applied Ecdysteroids in the Large Milkweed Bug (Heteroptera: Lygaeidae)
1982
Exogenous ecdysteroids (ecdysone, 20-hydroxyecdysone and makisterone A) administered to reproducing females of Oncopelus fasciatus (Dallas) reduced egg hatch drastically. The ovicidal activity apparently stemmed from ecdysteroids—unchanged hormone or metabolites—transferred from mother into oocyte. Different stages of embryogenesis were affected. Makisterone A, the predominant ecdysteroid in normal embryos, is by far the most effective ecdysteroid.
The non-appearance of female-specific proteins in male Spilostethus pandurus)
1990
1. 1. Female-specific peptides can be detected by SDS-PAGE in the haemolymph when the female insects are 48 hr old. 2. 2. The age of the male insect at the moment of treatment with juvenile hormone I (JH I), JH III or ecdysone has no influence on the induction of the female-specific bands in male S. pandurus. 3. 3. Male insects exposed to the hormones for periods of time longer than 24 hr were also unable to show female-specific bands in their haemolymph. Consecutive treatments with JH were unable to induce these peptides in the males.