Photoperiod in relation to diapause in<i>Lygus hesperus</i>Knight

Beards, G. W.; Strong, Frank E.

doi:10.3733/hilg.v37n10p345

Cited by 57 publications

(40 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, greater or lesser differences were often found. A longer critical daylength for diapause termination than for diapause induction was found for Lygus hesperus (Beards and Strong, 1966), P. apterus (Saunders, 1983), P. brassicae (Brunnarius and Dumortier, 1984), Diatraea grandiosella (Takeda, 1985), and Ostrinia nubilalis ; the reverse was found for Homoeosoma electellum (Teetes et al, 1969) and Meleoma signoretti (Tauber et al, 1986, p. 117).…”

Section: Discussionmentioning

confidence: 89%

The Same Photoperiodic Clock May Control Induction and Maintenance of Diapause in the Spider Mite Tetranchus urticae

1993

View full text Add to dashboard Cite

In the spider mite Tetranychus urticae, both diapause induction (which takes place during the larval and nymphal stages) and diapause maintenance (in the adult female) are under photoperiodic control. The question of whether or not the same photoperiodic clock is involved in both photoperiodic reactions was investigated in eight strains of the spider mite, originating from different localities in Europe. The methods employed consisted of (1) determination of the relative importance of the photophase and scotophase in the two photoperiodic reactions; (2) comparison of photoperiodic response curves for diapause induction and diapause maintenance; and (3) determination of the effect of light breaks on the capacity of long nights to maintain diapause, and comparison with the effect of light breaks in diapause induction experiments. The scotophase appeared to be much more important than the photophase for both diapause induction and diapause maintenance. In all strains the critical daylength for diapause maintenance, measured at the moment of saturation of the response to long daylengths, was identical to the critical daylength for diapause induction. However, the critical daylength for diapause maintenance appeared to be labile; it shifted gradually to shorter values as the mites were kept in the cold for a longer period of time, or were kept at a higher temperature for a progressively longer period of time after their stay in the cold room. This seems to reflect a gradual loss of photoperiodic control of diapause maintenance as diapause development proceeds. Photoperiods close to the critical daylength appeared to be less strong with regard to diapause maintenance than shorter daylengths. Quantitative differences in the "strength" of different daylengths were found in all strains investigated. Interruption of the night by short pulses of light revealed either one or two peaks of sensitivity in the night, or one broad "trough" where the two peaks had merged. However, in each case maximal sensitivity to the light breaks occurred at the same position in the night for diapause induction and diapause maintenance. The many similarities found lead to the conclusion that most probably the same photoperiodic clock mechanism is involved in both diapause induction and diapause maintenance in T. urticae.

show abstract

Section: Discussionmentioning

confidence: 89%

The Same Photoperiodic Clock May Control Induction and Maintenance of Diapause in the Spider Mite Tetranchus urticae

1993

View full text Add to dashboard Cite

show abstract

“…Although Spurgeon and Brent (2010) questioned the validity of the criteria used to distinguish diapause in earlier studies, the consensus has been that diapause in the California Central Valley terminates in latefall (Beards and Strong 1966; Leigh 1966) to early-winter (Strong et al 1970). Upon diapause termination, adult L. hesperus mate and oviposit.…”

Section: Introductionmentioning

confidence: 99%

Oviposition Behaviors and Ontogenetic Embryonic Characteristics of the Western Tarnished Plant Bug,Lygus hesperus

Cooper

Spurgeon

2012

Journal of Insect Science

View full text Add to dashboard Cite

The western tarnished plant bug, Lygus hesperus Knight (Hemiptera: Miridae) is a key pest of fruit, vegetable, and field crops in the western United States, but many aspects of L. hesperus ecology are poorly documented. A sound understanding of oviposition behavior and characterization of the phases of embryonic development would be useful in studies of interactions between L. hesperus and its hosts, and in efforts to better understand the developmental consequences of low temperatures. Because L. hesperus insert their eggs into the host, most of the egg is obscured from view, and some aspects of oviposition and subsequent egg development cannot be observed directly. A novel observational method which took advantage of the propensity for L. hesperus to oviposit in semi-transparent sheets of agarose was used to observe oviposition and subsequent embryonic development. Lygus hesperus females stylet-probed prospective oviposition sites and during oviposition the ovipositor followed the path of the final probe. Oviposition, from insertion to withdrawal of the ovipositor, required ∼30 seconds. Identifiable phases of embryo development included egg swelling, katatrepsis, appearance of body segments and appendages, development of red pigmentation in the eyes and terminal antennal segments, and formation of the 3rd embryonic cuticle. These phases were observed at about 0.3, 0.4, 0.5, 0.6, and 0.8 of the total duration between oviposition and hatch, respectively. Infertile eggs did not exhibit any of these phases. Our descriptions of embryonic development will facilitate the study of L. hesperus egg biology and ecology, and permit estimates of egg population age structure and prediction of egg hatch.

show abstract

“…A longer critical daylength for dia pause termination than for diapause induction was found for Lygus hesperus (Beards & Strong, 1966), Pyrrhocoris apterus (Saunders, 1983), P. brassicae (Brunnarius & Dumortier, 1984), Diatraea grandiosella (Takeda, 1985), and Ostrinia nubilalis (Skopik & Takeda, 1986). 5 Diapause termination of P. fasciata in a resonance experiment with a constant scotophase of 8 h and a photophase which was varied from 4h to 72h, in steps of 4h.…”

Section: Length Of Photophase (H)mentioning

confidence: 99%

Photoperiodic clock of diapause termination in Pseudopidorus fasciata (Lepidoptera: Zygaenidae)

Li¹,

Xue²,

Hua³

et al. 2003

Eur. J. Entomol.

View full text Add to dashboard Cite

Abstract. Photoperiodic control of diapause termination was systematically investigated in Pseudopidorus fasciata. In 24 h lightdark cycles, the rate of diapause termination in this species depended on photoperiod. The critical night length (CNL) for diapause termination was 10 h, 0.5 h shorter than that for diapause induction. Night-interruption experiments with T = 24 showed that dia pause was effectively terminated when the scotophases separated by light pulse were shorter than the critical night length (10 h); no developing individuals were found if the duration of the pre-interruption scotophase or the post-interruption scotophase exceeded the CNL. A 15-min light pulse was sufficient to reverse the effect of long night when it was placed 8 h after lights-off. Resonance experiments with a constant photophase of 12 h or 16 h and various scotophases of 4-80 h showed an hourglass-type photoperiodic response, where no rhythmicity was found. In another resonance experiment with constant scotophase of 8 h and various photo phases of 4-72 h, all individuals developed into cocoons. In the Bunsow experiment, the response curve showed two apparent peaks for diapause termination, one being 8 h after lights-off, and another 8 h before lights-on. However, there was no periodic rhythmicity, which again indicates an hourglass principle. The results lead to the conclusion that the same photoperiodic clock mechanism (a long-night measuring hourglass) is involved in both diapause induction and termination.

show abstract

Photoperiod in relation to diapause inLygus hesperusKnight

Cited by 57 publications

References 20 publications

The Same Photoperiodic Clock May Control Induction and Maintenance of Diapause in the Spider Mite Tetranchus urticae

The Same Photoperiodic Clock May Control Induction and Maintenance of Diapause in the Spider Mite Tetranchus urticae

Oviposition Behaviors and Ontogenetic Embryonic Characteristics of the Western Tarnished Plant Bug,Lygus hesperus

Photoperiodic clock of diapause termination in Pseudopidorus fasciata (Lepidoptera: Zygaenidae)

Contact Info

Product

Resources

About