scholarly journals Evaluating Aggregation Membership and Copulatory Success in the Stink Bug,Euschistus conspersus, using Field and Laboratory Experiments

2011 ◽  
Vol 11 (2) ◽  
pp. 1-9 ◽  
Author(s):  
Christian H. Krupke ◽  
Vincent P. Jones ◽  
Jay F. Brunner
Keyword(s):  
Laboratory Experiments ◽  
Stink Bug ◽  
Euschistus Conspersus ◽  
Copulatory Success

Outbreak of Eremothecium coryli Fruit Rot of Tomato in California

2000 ◽  
Vol 1 (1) ◽  
pp. 23
Author(s):  
G. M. Miyao ◽  
R. M. Davis ◽  
H. J. Phaff
Keyword(s):  
Lycopersicon Esculentum ◽  
Fruit Rot ◽  
Stink Bug ◽  
Ripe Fruit ◽  
Sacramento Valley ◽  
Eremothecium Coryli ◽  
Euschistus Conspersus

A ripe fruit rot of tomato (Lycopersicon esculentum) associated with stink bug (Euschistus conspersus) feeding caused extensive losses in the Sacramento Valley of California in 1998. Posted 16 August 2000.

A Stink Bug, Euschistus conspersus, Destructive to Deciduous Fruits in California

1952 ◽  
Vol 45 (2) ◽  
pp. 254-257 ◽  
Author(s):  
Arthur D. Borden ◽  
Harold F. Madsen ◽  
Arthur H. Retan
Keyword(s):  
Stink Bug ◽  
Euschistus Conspersus

Parasitoids of the Consperse Stink Bug (Hemiptera: Pentatomidae) in North Central Washington and Attractiveness of a Host-Produced Pheromone Component

2003 ◽  
Vol 38 (1) ◽  
pp. 84-92 ◽  
Author(s):  
Christian H. Krupke ◽  
Jay F. Brunner
Keyword(s):  
Field Experiments ◽  
Common Species ◽  
Host Finding ◽  
Pheromone Component ◽  
Stink Bug ◽  
North Central ◽  
Egg Masses ◽  
Verbascum Thapsus ◽  
Euschistus Conspersus ◽  
Study Sites

The parasitoid complex of the consperse stink bug, Euschistus conspersus Uhler, was investigated in a series of field experiments conducted in native vegetation surrounding commercial apple orchards in the state of Washington. Rearing of parasitoids from adult E. conspersus confirmed the presence of two tachinid species, Gymnosoma filiola Loew and Gymnoclytia occidentalis Townsend. Three species of scelionids were reared from fresh egg masses placed on mullein plants (Verbascum thapsus L.) with Trissolcus utahensis (Ashmead) being the most common species. Though some parasitism was recorded in all study sites by both tachinids and scelionids, overall levels of parasitism were low (<10%). Predation comprised the major source of egg mortality in the field. Bucket traps baited with the male-produced aggregation pheromone component, methyl (2E,4Z)-decadienoate, captured significantly more G. occidentalis than unbaited controls, suggesting that it may use this compound as a host-finding kairomone. A test comparing E. conspersus egg masses placed on baited vs. unbaited V. thapsus revealed no differences in the rate of parasitism by scelionid parasitoids.

Substrate-borne vibrational signals of the Consperse stink bug (Hemiptera: Pentatomidae)

2003 ◽  
Vol 135 (4) ◽  
pp. 555-567 ◽  
Author(s):  
Heather L. McBrien ◽  
Jocelyn G. Millar
Keyword(s):  
Pulse Duration ◽  
Stink Bug ◽  
Song Repertoire ◽  
Reproductive Behaviors ◽  
Short Pulses ◽  
Pulse Trains ◽  
Vibrational Signals ◽  
Repetition Time ◽  
Close Range ◽  
Euschistus Conspersus

AbstractThere is increasing evidence that short-range reproductive behaviors of phytophagous pentatomid bugs are mediated by vibrational signals. These signals have not yet been examined for bugs in the genus Euschistus, which contains several species native to the Americas. Substrate-borne vibrational signals (songs) were recorded from both sexes of the Consperse stink bug, Euschistus conspersus Uhler, an economically important agricultural pest in western North America. Females produced two songs (FS-1 and FS-2), each consisting of a series of frequency-modulated pulses with a pulse duration of 352 ± 105 (mean ± SD) and 163 ± 36 ms, respectively. Males produced four distinct songs, two composed of frequency-modulated pulses (MS-1 and MS-3), one consisting of narrowband pulses (MS-2), and one composed of a series of 1–6 short pulses, many of which were fused to form distinct pulse trains (MS-4). For both males and females, songs consisting of very short, frequency-modulated pulses (FS-2 and MS-3), with a mean pulse duration <170 ms, were emitted when the other member of the pair was silent. Songs made up of longer, frequency-modulated pulses (FS-1 and MS-1) were produced spontaneously and in response to songs from conspecifics. Pulses of MS-2 were produced by a male once a duet with a female had been initiated. This song had no frequency modulation and a longer mean pulse repetition time than MS-1. The two female songs and three of the male songs (MS-1, MS-2, and MS-3) were produced during the calling phase of mating behavior. Pulse trains of MS-4 were emitted during close-range courtship. During copulation males produced intermittent pulses of MS-1, the function of which is unknown. Dominant frequencies of all songs ranged from 102 to 136 Hz, comparable with those of other pentatomid songs. Although there were superficial similarities in the song structures of E. conspersus when compared with those of other pentatomid species, the song repertoire of E. conspersus was distinct and unique.

Field Attraction of the Stink Bug Euschistus conspersus (Hemiptera: Pentatomidae) to Synthetic Pheromone-Baited Host Plants

2001 ◽  
Vol 94 (6) ◽  
pp. 1500-1505 ◽  
Author(s):  
Christian H. Krupke ◽  
Jay F. Brunner ◽  
Michael D. Doerr ◽  
Andrew D. Kahn
Keyword(s):  
Host Plants ◽  
Stink Bug ◽  
Synthetic Pheromone ◽  
Euschistus Conspersus ◽  
Field Attraction

scholarly journals Outbreak of Eremothecium coryli Fruit Rot of Tomato in California

Plant Disease ◽  
2000 ◽  
Vol 84 (5) ◽  
pp. 594-594 ◽  
Author(s):  
G. M. Miyao ◽  
R. M. Davis ◽  
H. J. Phaff
Keyword(s):  
Tomato Fruit ◽  
Fruit Rot ◽  
Stink Bug ◽  
Ascomycetous Yeast ◽  
Eremothecium Coryli ◽  
Euschistus Conspersus ◽  
Dark Green ◽  
The University ◽  
Plastic Containers ◽  
Scientific Publishers

A ripe fruit rot of tomato (Lycopersicon esculentum) associated with stink bug (Euschistus conspersus) feeding caused extensive losses in the Sacramento Valley of California in 1998. Portions of several fields were abandoned at harvest due to fruit rot levels >30%. Symptoms included a soft, water-soaked rot often surrounding a firm, dark green island. Entire fruit sometimes became watery and soft. The ascomycetous yeast, Eremothecium coryli, characterized by spindle-shaped ascospores with long, thin, whip-like terminal appendages (1), was consistently isolated from diseased tissue plated on V8 or potato dextrose agar amended with tetracycline. Ripe tomato fruit were inoculated with a 0.1-ml suspension of 1.5 × 105 ascospores per ml injected to a depth of ≈4 mm to simulate stink bug probing. Fruit were placed in plastic containers and, in initial tests, were held at room temperature. In subsequent tests, inoculated fruit were maintained at constant temperatures of 20, 25, 30, or 35°C. Controls included inoculum either placed on the fruit surface or injected with sterilized water. Each treatment consisted of one to four fruit in two to four replications. All experiments were repeated. Lesions were visible within 5 days after inoculation and were >25 mm in diameter after 7 days. Progression of rot occurred at all temperatures but was fastest at 30 and 35°C. Controls remained symptomless. E. coryli was reisolated from infected fruit. This is the first documentation of field-level losses caused by E. coryli associated with stink bug feeding. Isolates are maintained in the Herman J. Phaff Collection of Yeast and Yeast-like Microorganisms at the University of California, Davis. Reference: (1) G. S. de Hoog et al. 1998. Eremothecium Borzi emend. Kurtzman. Pages 201-208 in: The Yeasts—A Taxonomic Study. C. P. Kurtzman and J. W. Fell, eds. Elsevier Scientific Publishers, Amsterdam.

Covering of cometary nucleus by refractory crust and its evolution into asteroid-like body

1999 ◽  
Vol 173 ◽  
pp. 365-370
Author(s):  
Kh.I. Ibadinov
Keyword(s):  
Laboratory Experiments ◽  
Cometary Nucleus ◽  
Sublimation Rate ◽  
Cometary Nuclei ◽  
Short Period Comet ◽  
Short Period ◽  
Brightness Decrease ◽  
Crust Thickness ◽  
Ice Sublimation ◽  
Period Comet

AbstractFrom the established dependence of the brightness decrease of a short-period comet dependence on the perihelion distance of its orbit it follows that part of the surface of these cometary nuclei gradually covers by a refractory crust. The results of cometary nucleus simulation show that at constant insolation energy the crust thickness is proportional to the square root of the insolation time and the ice sublimation rate is inversely proportional to the crust thickness. From laboratory experiments resulted the thermal regime, the gas productivity of the nucleus, covering of the nucleus by the crust, and the tempo of evolution of a short-period comet into the asteroid-like body studied.

When Does Voice Have to be More Than Only Listening? Procedural Justice Effects as a Function of Confident Leadership

2010 ◽  
Vol 9 (2) ◽  
pp. 69-78 ◽  
Author(s):  
David De Cremer ◽  
Maarten Wubben
Keyword(s):  
Procedural Justice ◽  
Interaction Effect ◽  
Laboratory Experiments ◽  
Negative Emotions

The present research examined how voice procedures and leader confidence affect participants’ negative emotions and willingness to withdraw. It was predicted that receiving voice would be valued out of instrumental concerns, but only when the enacting leader was high in confidence. Two laboratory experiments indeed showed an interaction between type of voice (pre-decisional vs. post-decisional) and leader’s confidence (low vs. high) on participants’ negative emotions and willingness to withdraw. In particular, post-decision voice only led to more negative responses than did pre-decision voice when the enacting leader was high in confidence. Negative emotions mediated this interaction effect of type of voice on willingness to withdraw. Implications for integrating the leadership and procedural justice literatures are discussed.

Sign in / Sign up

Export Citation Format

Share Document