scholarly journals A note on the detection of the carrot weevil in Nova Scotia

2005 ◽  
Vol 74 (2) ◽  
pp. 113-115 ◽  
Author(s):  
J.-P.R. LeBlanc ◽  
G. Boivin
Keyword(s):  
Nova Scotia ◽  
North America ◽  
Daucus Carota ◽  
Spring Migration ◽  
Atlantic Canada ◽  
Vegetable Crops ◽  
Northeastern North America ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

The carrot weevil, Listronotus oregonensis [Coleoptera: Curculionidae], is a significant pest of vegetable crops in northeastern North America. However, the species had not been previously detected in Atlantic Canada. In 1985,1986, and 1988, attempts to detect this pest in Nova Scotia were unsuccessful. In 1992, in one of three carrot (Daucus carota) fields monitored using thigmotactic wooden-plate traps baited with fresh carrots, six individuals were captured during the spring migration of the inseetfrom overwintering sites into a carrot field near Great Village, Nova Scotia.

Degree-day models to predict carrot weevil (Coleoptera: Curculionidae) emergence and oviposition in Nova Scotia, Canada

2020 ◽  
Vol 152 (3) ◽  
pp. 374-388
Author(s):  
Suzanne Blatt ◽  
Deney Augustine Joseph ◽  
G. Christopher Cutler ◽  
A. Randall Olson ◽  
Scott White
Keyword(s):  
Nova Scotia ◽  
Adult Emergence ◽  
Hill Equation ◽  
Base Temperature ◽  
Degree Days ◽  
Eastern Canada ◽  
Leaf Stage ◽  
True Leaf ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

AbstractCarrot weevil, Listronotus oregonensis (LeConte) (Coleoptera: Curculionidae), is a pest of carrot (Daucus carota var. sativus Hoffmann; Apiaceae) throughout eastern Canada. Carrot weevil emergence and oviposition were monitored in commercial carrot fields in Nova Scotia. Cumulative degree days were calculated using a base temperature of 7 °C (DD7), and models were developed to predict cumulative emergence and oviposition using nonlinear regression. Cumulative emergence and oviposition were adequately explained as functions of DD7 by a three-parameter sigmoidal Hill equation. Our emergence model predicted initial and peak adult emergence at 35 and 387 DD7, respectively, with oviposition on carrot baits occurring as early as 42 DD7. Models were then validated to evaluate how well they performed. Oviposition on carrot plants began at the fourth true-leaf stage (342 DD7) and continued until eleventh true-leaf stage. Growers using these models can identify their window of opportunity to manage their carrot weevil populations targeting the majority of emerged adults before oviposition begins in the field.

Prize and Prejudice

1997 ◽  
Author(s):  
Faye Margaret Kert
Keyword(s):  
Nineteenth Century ◽  
Nova Scotia ◽  
North America ◽  
New Brunswick ◽  
Economic Impact ◽  
War Of 1812 ◽  
Atlantic Canada ◽  
Legal Evolution ◽  
Negative Reputation

This journal examines privateering and naval prizes in Atlantic Canada in the maritime War of 1812 - considered the final major international manifestation of the practice. It seeks to contextualise the role of privateering in the nineteenth century; determine the causes of, and reactions to, the War of 1812; determine the legal evolution of prize law in North America; discuss the privateers of Nova Scotia and New Brunswick, and the methods they utilised to manipulate the rules of prize making during the war; and consider the economic impact of the war of maritime communities. Ultimately, the purpose of the journal is to examine privateering as an occupation in order to redeem its historically negative reputation. The volume is presented as six chapters, plus a conclusion appraising privateering, and seven appendices containing court details, prize listings, and relevant letters of agency.

scholarly journals Floating Rowcovers Improve Germination and Reduce Carrot Weevil Infestations in Carrot

HortScience ◽  
2008 ◽  
Vol 43 (5) ◽  
pp. 1619-1622 ◽  
Author(s):  
Djamila Rekika ◽  
Katrine A. Stewart ◽  
Guy Boivin ◽  
Sylvie Jenni
Keyword(s):  
Early Development ◽  
Daucus Carota ◽  
Insect Control ◽  
Harvest Time ◽  
Emergence Time ◽  
Fresh Weight ◽  
Listronotus Oregonensis ◽  
Carrot Weevil ◽  
Leaves And Roots ◽  
Weevil Infestation

A lightweight agrotextile floating rowcover (10 g·m−2) designed for insect control was evaluated for its potential to reduce carrot weevil [Listronotus oregonensis (Le conte)] damage and to improve germination and carrot (Daucus carota L.) yield. The floating rowcover had no effect on total emergence and spread on emergence time but decreased emergence time by 0.5 day. Although floating rowcovers generally increased fresh weight of carrot leaves and roots during early development, no effect was detected late in the season and at harvest time. Carrot weevil damage of uncovered plants was 0.4 tunnels per root in 2006 and 2.0 tunnels per root in 2005. In both years, covering carrots with a floating rowcover for a period of 35 days after sowing reduced carrot weevil damage by 65% to 75%. In most years with low or medium carrot weevil infestation, the use of a rowcover could eliminate the use of insecticide to control this pest.

Radiometric age of the volcanics at Arisaig, Nova Scotia, and the Ordovician–Silurian boundary

1968 ◽  
Vol 5 (2) ◽  
pp. 311-317 ◽  
Author(s):  
Paul D. FullAgar ◽  
Michael L. Bottino
Keyword(s):  
Nova Scotia ◽  
North America ◽  
Isotopic Composition ◽  
Northeastern North America ◽  
Early Ordovician ◽  
Rock Samples ◽  
Lower Silurian ◽  
Best Estimate

Volcanics from the Arisaig-Antigonish district of northeastern Nova Scotia underlie fossiliferous Lower Silurian (Lower Llandovery) sediments. The minimum geologic age of the volcanics is Early Silurian, and the maximum geologic age probably is post-Early Ordovician. Twelve whole-rock samples of the volcanics were analyzed for rubidium, strontium, and strontium isotopic composition. The best estimate of the age of these twelve samples is 430 ± 15 m.y.; this is a maximum age or close to a maximum age for the Ordovician–Silurian boundary. This age plus the authors' results for the Silurian-Devonian boundary indicate that the Silurian Period in northeastern North America may have been shorter than generally has been estimated. Additional Silurian-age volcanics are being analyzed.

DESCRIPTION OF THREE NEWANAPHESSPECIES (HYMENOPTERA: MYMARIDAE), EGG PARASITOIDS OF THE CARROT WEEVIL,LISTRONOTUS OREGONENSIS(LECONTE) (COLEOPTERA: CURCULIONIDAE), AND REDESCRIPTION OFANAPHES SORDIDATUSGIRAULT

1997 ◽  
Vol 129 (5) ◽  
pp. 959-977 ◽  
Author(s):  
John T. Huber ◽  
Sylvain Côté ◽  
Guy Boivin
Keyword(s):  
New Species ◽  
Nova Scotia ◽  
Female Offspring ◽  
Egg Parasitoids ◽  
Reciprocal Crosses ◽  
First Report ◽  
Unidentified Species ◽  
Listronotus Oregonensis ◽  
Carrot Weevil ◽  
Anaphes Listronoti

AbstractThree new mymarid egg parasitoids of the carrot weevil,Listronotus oregonensis(LeConte) (Coleoptera: Curculionidae), are described:Anaphes coteiHuber from Nova Scotia;Anaphes listronotiHuber from Quebec; andAnaphes victusHuber from Quebec, Michigan, and Texas. A key to the species is given.Anaphes sorditatus(Girault), with which at least one of the new species was previously confused, is redescribed. Althoughlistronotiandsorditatuscannot presently be distinguished morphologically, they are biologically distinct and have different hosts. Crosses between malesordidatusand femalevictusyielded female offspring in 27% of the tests but none in the reciprocal crosses. The corresponding control crosses resulted in 90 and 30% female offspring. Mating did not occur in attempts to crosssordidatuswithlistronoti. On three occasions an unidentified species ofAnagruswas reared from field-collected carrot weevil eggs. This represents the first report of anAnagrusspecies from Curculionidae.

scholarly journals The First Record for Altai Fescue, Festuca altaica (Poaceae), in Nova Scotia, from an Eastern Alpine Site on Cape Breton Island

2017 ◽  
Vol 131 (2) ◽  
pp. 164-169
Author(s):  
Stephen Darbyshire ◽  
Sean Blaney ◽  
Sean Basquill
Keyword(s):  
Nova Scotia ◽  
North America ◽  
First Record ◽  
Grass Species ◽  
Southern Limit ◽  
Cape Breton Island ◽  
Northeastern North America ◽  
Alpine Habitat ◽  
Cape Breton

Altai Fescue, Festuca altaica Trinius, is an amphi-Beringian grass species also known from isolated, but widespread, locations in northeastern North America. The occurrence reported here, at the southern limit of eastern alpine habitat in Canada, represents the first for Nova Scotia.

scholarly journals The Christmas Cove Dyke of coastal Maine, USA, and regional sources for Early Mesozoic flood basalts in northeastern North America

2014 ◽  
Vol 50 ◽  
pp. 66 ◽  
Author(s):  
James Gregory McHone ◽  
Arthur M. Hussey ◽  
David P. West ◽  
David G. Bailey
Keyword(s):  
North America ◽  
New England ◽  
Coarse Grained ◽  
Atlantic Canada ◽  
Rift Basin ◽  
Font Size ◽  
Northeastern North America ◽  
Southern New England ◽  
Early Mesozoic ◽  
Central Atlantic

<p> </p><p style="margin: 1em 0px; line-height: 200%; text-indent: 0.5in;"><span style="line-height: 200%; font-family: 'Minion Pro','serif'; font-size: 12pt;">A large Early Mesozoic quartz tholeiite dyke has been mapped discontinuously for 190 km in southern coastal Maine, USA. Including its type locality at Christmas Cove (South Bristol, Maine, USA), the dyke has features of a generally ENE strike; dip usually steep to the SSE but abruptly turning very shallow in short sections; and widths of 9 to 35 m. </span><span style="line-height: 200%; font-family: 'Minion Pro','serif'; font-size: 12pt; mso-ansi-language: EN-US;" lang="EN-US">The dyke rock has a distinctive cross-columnar field appearance, and a subophitic to micro-porphyritic</span><span style="line-height: 200%; font-family: 'Minion Pro','serif'; font-size: 12pt;"> texture with abundant Ti-bearing augite, calcic plagioclase, scattered euhedral orthopyroxene phenocrysts, and coarse-grained glomerophyric clumps of augite with plagioclase. Several <sup>40</sup>Ar/<sup>39</sup>Ar whole-rock dates for this and associated regional dykes are close to 201 Ma, in agreement with ages of other Early Mesozoic dykes and basalts of the Central Atlantic Magmatic Province (CAMP). The geographic position, age, whole-rock chemistry, and petrography indicate that the Christmas Cove Dyke is co-magmatic or contiguous with the Higganum-Holden Dyke of southern New England, which was a source for the Talcott Basalt of the Early Mesozoic Hartford rift basin. The dyke system is a 700-km long fissure source for the earliest rift basin basalts preserved in northeastern North America, and it virtually connects the Hartford Basin and the Fundy Basin in Atlantic Canada. The Caraquet Dyke of New Brunswick and central Maine may be co-magmatic with the Buttress Dyke and Holyoke Basalt of southern New England, but lava from it is not preserved in Atlantic Canada or Maine.</span></p><p> </p>

scholarly journals Population genetic structure of the carrot weevil ( Listronotus oregonensis ) in North America

2022 ◽  
Author(s):  
Marianne Bessette ◽  
Dave T. Ste‐Croix ◽  
Jacques Brodeur ◽  
Benjamin Mimee ◽  
Annie‐Ève Gagnon
Keyword(s):  
Genetic Structure ◽  
North America ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

scholarly journals The detection of Anaphes sp. nov. [Hymenoptera : Mymaridae], an egg parasitoid of the carrot weevil in Nova Scotia

2005 ◽  
Vol 77 (2) ◽  
pp. 79-82 ◽  
Author(s):  
L.R.E. Hopper ◽  
J.-P.R. Le Blanc ◽  
G. Boivin
Keyword(s):  
Nova Scotia ◽  
Parasitic Wasp ◽  
Egg Parasitoid ◽  
Width Ratio ◽  
Length Width ◽  
Listronotus Oregonensis ◽  
Growth Chambers ◽  
Carrot Weevil ◽  
Anaphes Listronoti ◽  
A New Species

The wasps Anaphes victus (Huber) and Anaphes listronoti (Huber) [Hymenoptera : Mymaridae] parasitize 50% of the eggs of carrot weevil, Listronotus oregonensis (Le Conte) [Coleoptera : Curculionidae] in Quebec and in Ontario. Attempts to detect either of these egg parasites from exposed carrot weevil eggs in Nova Scotia were unsuccessful. However, 48 individuals of a new species of parasitic wasp, Anaphes sp. nov. [Hymenoptera : Mymaridae], were detected in carrot (Daucus carota) fields in Nova Scotia, using carrots infested in growth chambers with carrot weevil eggs. Anaphes sp. nov. is distinguishable from the other parasites of the carrot weevil by characteristics of the forewing. Anaphes sp. nov. has a forewing length : width ratio greater than 7 :3 while A. victus and A. listronoti have a forewing length : width ratio of less than 6 : 7.

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