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.

Relationship between carrot weevil (Coleoptera: Curculionidae) infestation, damage, and planting dates of parsley (Apiaceae)

2002 ◽  
Vol 134 (1) ◽  
pp. 125-135 ◽  
Author(s):  
Angel N. Torres ◽  
Casey W. Hoy
Keyword(s):  
Control Measures ◽  
Petroselinum Crispum ◽  
Initial Population ◽  
Life Stages ◽  
Seasonal Activity ◽  
Planting Dates ◽  
Listronotus Oregonensis ◽  
Carrot Weevil ◽  
The Impact ◽  
Root Feeding

AbstractSeasonal activity of carrot weevil, Listronotus oregonensis (LeConte), adults, eggs, larvae, and root feeding was studied in plots of parsley, Petroselinum crispum (Mill.) Nyman ex A.W. Hill, by sampling weekly from mid-May to the first week of September in 1998 and 1999. The initial population of overwintering adults, one complete generation, and at least a partial second generation were observed. The majority of eggs were deposited in June and most of the larvae were counted in July; the greatest damage was noticed from July onward. In both 1998 and 1999, the overall seasonal means of adults, eggs, larvae, and root feeding were significantly different among plots that were planted on different dates. Root feeding and all carrot weevil life stages sampled steadily decreased from the earliest to the latest planting. Most of the damage occurred in parsley plantings sown from late February until the third week of April. The number of eggs removed from parsley plants during the first cutting was significantly different among planting dates, but the impact of this removal may not be significant in infestation reduction. Results of this study will help parsley growers to target when control measures for carrot weevil will be most effective and which plantings are most likely to be damaged.

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.

Burning Nettle (Urtica urens) Germination and Seedbank Characteristics in Coastal California

Weed Science ◽  
2016 ◽  
Vol 64 (4) ◽  
pp. 664-672 ◽  
Author(s):  
Ran N. Lati ◽  
Shachar Shem-Tov ◽  
Steven A. Fennimore
Keyword(s):  
Seasonal Pattern ◽  
Field Studies ◽  
Growth Cycle ◽  
Germination Percentage ◽  
Effect Of Temperature ◽  
Optimal Timing ◽  
Base Temperature ◽  
Control Programs ◽  
Hand Weeding ◽  
Noxious Weed

Burning nettle is a noxious weed that commonly infests coastal California vegetable fields. Weed control programs for lettuce and fresh spinach grown in this area do not adequately control burning nettle, and escaped weeds that mature are highly problematic during hand weeding and harvesting. Information on the biology and ecology of burning nettle is limited, and work was conducted to develop information about this weed. The objectives of this study were to evaluate the effect of temperature on burning nettle germination and to determine its base temperature value, to characterize the germination pattern of this weed and seedbanks under local California coastal conditions, and to estimate the optimal timing for burning nettle removal by herbicides and physical methods. The upper optimal temperature for burning nettle germination was 22.8 C, but there was no difference in the final germination percentage between 4 and 22.8 C. The base temperature was determined to be 3 6 0.2 C, and this information allowed the development of temperature-based optimal control timing models. In the field, burning nettle emerged throughout the year without any seasonal pattern, and germinable seeds were also found in the seedbank throughout the year. Burning nettle was able to complete a growth cycle throughout the year in coastal California. Burning nettle has a short growth cycle that allows it to set viable seeds within 466 6 13 growing degree days (GDD), and this timing is critical for burning nettle removal by herbicides, cultivation, or hand weeding. The optimal timing for phenmedipham application at 180 g ai ha–1was estimated to be 205 GDD. The germination and seedbank field studies indicate why burning nettle is so well adapted to the mild climate of coastal California. However, results presented here suggest strategies to reduce the burning nettle seedbank, improve its control, and allow more efficient lettuce and fresh spinach production.

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.

Trapping of larvae of the cattle tick Boophilus microplus by Stylosanthes scabra under grazing conditions

1989 ◽  
Vol 40 (6) ◽  
pp. 1301 ◽  
Author(s):  
LJ Wilson ◽  
RW Sutherst ◽  
JD Kerr
Keyword(s):  
Laboratory Tests ◽  
Seasonal Pattern ◽  
Tick Control ◽  
Boophilus Microplus ◽  
Cattle Tick ◽  
Research Station ◽  
Morphological Attributes ◽  
Control Programs ◽  
Per Se ◽  
Stylosanthes Scabra

Several varieties of the leguminous genus Stylosanthes have the capacity to trap larvae of the tick Boophilus microplus. This capacity was assessed for S. scabra plants collected from grazed fields at two locations, Brian Pastures Research Station and 'The Springs' in central Queensland. Morphological attributes which may affect the capacity of plants to trap tick larvae were recorded. In laboratory tests, plants collected from Brian Pastures trapped 27% of larvae in summer and 12% in winter, whilst plants from 'The Springs' trapped an average of 12%, with no seasonal pattern discernible. The percentage of branches which were sticky was the major determinant of a plant's capacity to trap ticks. Variation in stickiness per se was less important. Frost and burning temporarily reduced tick-trapping capacity, but after four months, burnt plants trapped a higher percentage of larvae than unburnt plants due to the production of sticky regrowth. The implication of the results for the use of S. scabra in tick control programs is discussed.

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.

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