Results 161 to 170 of about 8,878 (215)

Geographic variation in photoperiodic diapause induction and diapause intensity in Sericinus montelus (Lepidoptera: Papilionidae)

Insect Science, 2011
Abstract  Due to the risk of extinction and ornamental value of the swallowtail butterfly, Sericinus montelus Gray (Lepidoptera: Papilionidae) in China, knowledge about local adaptations is important for the conservation and economical utilization of the species.
Xiao‐Ping Wang, Qiu‐Sheng Yang, Peter Dalin, Xing‐Miao Zhou, Zhi‐Wen Luo, Chao‐Liang Lei   +5 more
openaire   +1 more source

Effect of thermoperiod on diapause intensity in Pyrrhocoris apterus (Heteroptera Pyrrhocoridae)

Journal of Insect Physiology, 2001
The intensity of adult diapause in Pyrrhocoris apterus was measured in two series of experiments as the duration of pre-oviposition period at a constant temperature of 25 degrees C after transfer from short (12L:12D) to long day conditions (18L:6D). Higher diapause intensity was induced with a thermoperiod than at constant temperatures.
, Kalushkov, , Hodková, , Nedved, , Hodek   +3 more
openaire   +2 more sources

Effects of putrescine on diapause induction and intensity, and post‐diapause development of Helicoverpa armigera

Entomologia Experimentalis et Applicata, 2010
AbstractEffects of putrescine on diapause induction and intensity, and post‐diapause development in Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) from Wuhan, Hubei, China were studied in the laboratory at different temperatures and photoperiod conditions. The results showed a generally higher incidence of diapause in putrescine‐feeding groups.
Sheng‐Bing Wu, Man‐Qun Wang, Guoan Zhang   +2 more
openaire   +1 more source

Egg Diapause in Ephippiger Cruciger (Orthoptera: Tettigoniidae): II. The Intensity and Elimination of the Final Egg Diapause

Journal of Experimental Biology, 1977
ABSTRACT Unlike the initial diapause in Ephippiger cruciger, the late embryonic diapause occurs in every egg in natural environmental conditions. It is eliminated by one relatively prolonged period of cooling and the proportion of eggs completing diapause development increases with increased cooling time.
R. L. Dean, J. C. Hartley
openaire   +1 more source

Geographic variation of diapause intensity in the spider mite Tetranychus urticae

Physiological Entomology, 1993
Abstract. Eight strains of the spider mite Tetranychus urticae , originating from different localities in western and central Europe, with latitudes ranging from 40.5 to 60 o N, displayed marked differences in the period of chilling ...
D. S. KOVEOS, A. KROON, A. VEERMAN
openaire   +1 more source

Light Intensity, Photoperiod, and Diapause Induction in Face Flies (Diptera: Muscidae)

Environmental Entomology, 1990
In the fall, adult face flies enter a facultative diapause in which mating and ovarian maturation do not take place, and their fat bodies become hypertrophied. Laboratory studies implicate short photoperiod as the primary inducer of diapause, but the response is temperature-dependent.
L. D. Evans, E. S. Krafsur
openaire   +1 more source

Relationships between body weight of overwintering larvae and supercooling capacity; diapause intensity and post-diapause reproductive potential in Chilo suppressalis Walker

Journal of Insect Physiology, 2011
The rice stem borer, Chilo suppressalis Walker, overwinters in China as a larva in facultative diapause. The instars and body weights of overwintering larvae vary widely. In this paper, the relationships between body weight and supercooling capacity, diapause intensity and post-diapause reproductive potential of overwintering larvae collected in late ...
Shu, Xu, Ming-Liang, Wang, Nan, Ding, Wei-Hua, Ma, Yan-Ning, Li, Chao-Liang, Lei, Xiao-Ping, Wang   +6 more
openaire   +2 more sources

Diapause Prevention in Aphidoletes aphidimyza (Diptera: Cecidomyiidae) by Low-intensity Light

Environmental Entomology, 1986
Low-intensity radiation at night prevented diapause in larvae of the predatory midge Aphidoletes aphidimyza (Rondani) under environmental conditions (9:15 [L:D] photoperiod and 2l:l5°C [T:C] thermoperiod) that induced 100% diapause when “night” was dark.
Linda A. Gilkeson, Stuart B. Hill
openaire   +1 more source

Geographic variation in critical photoperiod and in diapause intensity of Chrysopa carnea (Neuroptera)

Journal of Insect Physiology, 1972
Abstract Two strains of Chrysopa carnea, one originating from Ithaca, New York (42°27′ N) and one from Chandler, Arizona (33°19′ N) displayed marked differences in both initiation and intensity of the facultative reproductive diapause. The northern stock had a critical photoperiod 1 hr longer (between LD 13·5 : 10·5 and LD 14 : 10) than the southern ...
Mauice J. Tauber, Catherine A. Tauber
openaire   +1 more source

HERITABILITY OF DIAPAUSE INTENSITY IN HYPHANTRIA CUNEA AND CORRELATED FITNESS RESPONSES

The Canadian Entomologist, 1970
AbstractThe heat requirements for diapause termination in pupae of Hyphantria cunea are subject to a high degree of generic control. Offspring–parent regression analysis based on a positively assortative mating pattern, which is the normal pattern in field populations of this species, provides a slope of 0.60.
R. F. Morris, W. C. Fulton
openaire   +1 more source