Biological characteristics of Evania appendigaster (L.) (Hymenoptera: Evaniidae) in different densities of Periplaneta americana (L.)
oothecae (Blattodea: Blattidae).
The study, published Monday, observed three American female cockroaches and found their egg cases, or
oothecae, matured faster when the females were together than when they were isolated, (http://www.japantimes.co.jp/news/2017/03/14/national/science-health/cockroach-longevity-linked-to-female-cohabitation/#.WMfxZRiZP-Y) Japan Times reported.
(2004) confirmed this observation by recording oviposition dates in the field, later collecting and refrigerating egg cases until 1 April and then reporting that earlylaid
oothecae hatched significantly earlier than those laid later, indicating a development period that begins at fertilization and oviposition.
americana can lay 51
oothecae in 25 months, generating about 816 descendants within two years (GALLO et al., 2002).
asthenogmus was apparently attracted by the triatomine colony, it shows a wide geographical distribution, it is a natural parasitoid of several worldwide cockroach pest species, and it requires no preovipositional period (at least in cockroaches) and accepts 1- to 30-day-old
oothecae [25].
Descriptive figures of
oothecae and genitalia of some collected species are shown.
Adult mantises can't survive frigid temperatures, but the eggs inside
oothecae usually do.
Effects of three insecticide formulations in the removal and hatching of
oothecae of Blatella germanica.
Chinese mantis egg cases (
oothecae) are often sold commercially for biological insect control, but if you look carefully in the fall, you'll probably find one or two hidden in ornamental grasses or thick shrubs.
Also recorded was a large number of spider webs without spiders (n = 215) and a few live spiders and
oothecae (n = 18).
Twenty controls and eight treated
oothecae were assessed, and we observed that the number of eggs per ootheca decreased according to the rank of egg-laying (Fig.
pelios Order No of gizzards Type found in which were found Araneida 7 Spiders Coleoptera 10 Beetles Dermaptera 2 Adult earwigs Dictyoptera 6 Cockroaches Dictyoptera 3
Oothecae Diptera 6 Larvae Hymenoptera 14 Formicidae--Ants Hymenoptera 2 Apidae--Honeybees Isoptera 20 Adult Termites Lepidoptera 11 Larvae Neuroptera 3 Adult Lacewings Odonata 1 Adult damsel fly Orthoptera 34 Acrididae--Adults or nymphs Orthoptera 2 Gryllidae--Adults.