EVALUATION OF MONITORING TECHNIQUES FOR THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (COLEOPTERA: CURCULIONIDAE)

1985 ◽  
Vol 117 (8) ◽  
pp. 927-933 ◽  
Author(s):  
Guy Boivin
Keyword(s):  
Treatment Recommendations ◽  
Oviposition Period ◽  
Insecticide Treatment ◽  
Monitoring Techniques ◽  
Listronotus Oregonensis ◽  
Carrot Weevil ◽  
Trap Catches

AbstractFive trap designs were evaluated for their efficiency in capturing overwintering adults of the carrot weevil, Listronotus oregonensis (Le Conte). Trap catches were compared with counts of oviposition and nutrition cavities found in carrots placed on the ground. A trap consisting of 22 wooden plates, separated by metal washers and placed over a carrot which was used as bait, proved to be the most efficient. The weevils crawl between the plates, feed on the carrot, and are collected by dismantling the trap over a pan. This technique provided a seasonal record of carrot-weevil activity comparable to that obtained with carrot sections and can be used to issue insecticide-treatment recommendations prior to the beginning of the carrot-weevil oviposition period.

Variability and inheritance of the chorionic tubercles on eggs of Listronotus oregonensis (Coleoptera: Curculionidae)

2003 ◽  
Vol 135 (6) ◽  
pp. 765-774
Author(s):  
Guy Boivin ◽  
Jean-Pierre Nénon
Keyword(s):  
Average Density ◽  
Oviposition Period ◽  
Isofemale Lines ◽  
Egg Survival ◽  
Crossing Experiment ◽  
Egg Parasitism ◽  
Listronotus Oregonensis ◽  
Carrot Weevil ◽  
Precise Role

AbstractThe tubercles present on the egg chorion of the carrot weevil, Listronotus oregonensis (LeConte), are described and their variability in density quantified between females. Tubercle density varied by a factor of six between females, from 19 000 to 115 000 tubercles per mm2. The average density of tubercles for a given female remained constant throughout its oviposition period. When isofemale lines were created, the average tubercle density remained constant from generation to generation, and crossing experiment suggested that tubercle density was transmitted by the female. Using isofemale lines with low and high densities of tubercles, no effect on egg survival in water or susceptibility to egg parasitism was found. Tubercle density and the heritability of this character suggest a probable reproductive advantage for females that produce eggs with this chorionic pattern even though the precise role of these traits remains to be determined.

Population variability of a native and an introduced herbivore of carrots (Apiaceae)

2017 ◽  
Vol 149 (5) ◽  
pp. 592-599 ◽  
Author(s):  
Robert J. Lamb ◽  
Guy Boivin
Keyword(s):  
Introduced Species ◽  
Native Species ◽  
First Generation ◽  
Population Variability ◽  
Psila Rosae ◽  
Native Populations ◽  
Listronotus Oregonensis ◽  
Carrot Weevil ◽  
Trap Catches

AbstractLong-term, twice weekly, trap catches of the native carrot weevil, Listronotus oregonensis (LeConte) (Coleoptera: Curculionidae), and the introduced carrot rust fly, Psila rosae (Fabricius) (Diptera: Psilidae), were used to test the hypothesis that native populations fluctuate less from year-to-year than those of introduced species, because the native species has had more time to adapt to temporal variability in its habitat than an introduced species. Variability in annual abundance was estimated for 33 years, and for 11-year or 16–17-year subsets of the 33-year time series. Temporal population variability was quantified as PV, a proportion between 0 and 1. The native carrot weevil had a PV of 0.39, less than that of the introduced carrot rust fly with a PV of 0.67, supporting the hypothesis. Generation 1 for both species showed a decline in PV over three decades consistent with the hypothesis that adaptation to variability in the habitat leads to lower PV. Over 33 years, the carrot weevil developed a second generation with a PV of 0.70, higher than that of the first generation, which is consistent with the hypothesis that adaptation is required to stabilise population dynamics in a new habitat, in this case a new temporally defined habitat.

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.

THE LIFE HISTORY OF THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (COLEOPTERA: CURCULIONIDAE) UNDER CONTROLLED CONDITIONS

1976 ◽  
Vol 108 (9) ◽  
pp. 931-934 ◽  
Author(s):  
P. Martel ◽  
H. J. Svec ◽  
C. R. Harris
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Larval Stage ◽  
Egg Production ◽  
Laboratory Studies ◽  
Preoviposition Period ◽  
Complete Life Cycle ◽  
History Of ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

AbstractLaboratory studies on the biology of the carrot weevil, Listronotus oregonensis (LeConte), were performed at 21° and 27 °C. At 21 °C females laid eggs for 88 days on carrot slices and 94 days on foliage. Egg production per female averaged 156 and 175 on slices and leaves respectively. Eggs hatched after 8.3 days incubation and the larval stage comprising four instars was completed in 19.1 days. The prepupal and pupal stages lasted 3.7 and 9.4 days respectively. The complete life cycle including an average preoviposition period of 17 days was 57.6 days. Development was more rapid at 27 °C, with the complete life cycle taking only 37 days.

RELATIONSHIP BETWEEN TEMPERATURE AND DEVELOPMENT OF THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (LeCONTE) (COLEOPTERA: CURCULIONIDAE), IN THE LABORATORY

1986 ◽  
Vol 118 (12) ◽  
pp. 1287-1290 ◽  
Author(s):  
A.B. Stevenson
Keyword(s):  
Polynomial Function ◽  
Rate Of Development ◽  
Complete Development ◽  
Cubic Polynomial ◽  
Listronotus Oregonensis ◽  
Excellent Description ◽  
Carrot Weevil ◽  
The Relationship

AbstractRates of development of selected stages and complete development of the carrot weevil, Listronotus oregonensis (LeConte), were determined in the laboratory at controlled temperatures ranging from 17.5 to 30°C. Within that range of temperature, rates of development increased with temperature. Fitting the data to a cubic polynomial function provided an excellent description of the relationship between temperature and rate of development for all stages as shown by R2 values of at least 0.98.

A COMPARISON OF THREE METHODS OF MONITORING THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (LECONTE) (COLEOPTERA: CURCULIONIDAE)

1997 ◽  
Vol 129 (1) ◽  
pp. 187-194 ◽  
Author(s):  
A.B. Stevenson ◽  
E.S. Barszcz
Keyword(s):  
Seasonal Pattern ◽  
Seasonal Activity ◽  
Carrot Root ◽  
Control Programs ◽  
Linear Relationships ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

AbstractThe carrot weevil, Listronotus oregonensis (LeConte), was monitored at 11 research or commercial carrot plantings at Holland Marsh, Kettleby, Ontario, using three methods, i.e. wooden plate (Boivin) traps to capture adults, carrot root sections placed in the soil to detect oviposition, and recording the numbers of adults present on carrot root sections. All three methods provided similar records of the seasonal pattern of adult activity. At most sites, thresholds used to determine the need for insecticide applications were reached or exceeded soon after the beginning of monitoring.There were significant linear relationships among the seasonal activity parameters generated by the three methods and between those parameters and percentage injury at harvest. Control programs that would have resulted from the use of each method are discussed.

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.

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.

Sign in / Sign up

Export Citation Format

Share Document