STADIAL SUSCEPTIBILITY OF EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE), TO THE INSECT GROWTH REGULATOR DIMILIN®

1977 ◽  
Vol 109 (6) ◽  
pp. 893-894 ◽  
Author(s):  
J. Granett ◽  
A. Retnakaran
Keyword(s):  
Growth Regulator ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Insect Growth Regulator ◽  
Insect Growth ◽  
Eastern Spruce Budworm ◽  
Molting Process

Dimilin® 1-(4-chlorophenyl)-3-(2,6-difluorobenzoyl)-urea is an insect growth regulator which disrupts the insect's molting process. It has been field tested against eastern spruce budworm, Choristoneura fumiferana, with variable results (Dimond 1975; Retnakaran et al. 1976). In addition to fluctuations in many field parameters, innate variations in susceptibility to Dimilin during different stadia may influence efficacy. Retnakaran and Smith (1976) found that larvae during the 5th and 6th stadia were most susceptible.

scholarly journals EFFECT OF AN INSECT GROWTH REGULATOR ON NON-TARGET ARTHROPODS IN AN AERIAL APPLICATION AGAINST THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE), IN NEW BRUNSWICK, CANADA

1978 ◽  
Vol 110 (6) ◽  
pp. 561-567 ◽  
Author(s):  
B. Sechser ◽  
I. W. Varty
Keyword(s):  
New Brunswick ◽  
Growth Regulator ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Insect Growth Regulator ◽  
Aerial Application ◽  
Ant Colonies ◽  
Insect Growth ◽  
Field Samples ◽  
Juvenile Hormone Mimic

AbstractAirplane application of the insect growth regulator CGA 13353, a juvenile hormone mimic used experimentally against spruce budworm, Choristoneura fumiferana (Clem.), did not drastically reduce percentage parasitism in field samples of that host, but there was some evidence of susceptibility. Exploratory sampling of maple defoliators suggested that one species and its parasitoids suffered some mortality, but another species and its parasitoids did not. The treatment did not influence the viability of ant colonies.

LABORATORY AND FIELD EVALUATION OF A FAST-ACTING INSECT GROWTH REGULATOR AGAINST THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1982 ◽  
Vol 114 (6) ◽  
pp. 523-530 ◽  
Author(s):  
Arthur Retnakaran
Keyword(s):  
Growth Regulator ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Field Evaluation ◽  
Insect Growth Regulator ◽  
Contact Toxicity ◽  
Aerial Application ◽  
Insect Growth ◽  
Fast Acting ◽  
Meridic Diet

AbstractUC-62644, a moult-inhibiting insect growth regulator (IGR) belonging to the benzoylphenylureas, had an EC50 of 0.1 to 0.2 ppm in a meridic diet for the 3rd to 6th larval instars of the spruce budworm, Choristoneura fumiferana Clemens. The effects of the IGR were apparent in less than 48 h after ingestion and there was evidence for some contact toxicity. The larvae were unable to discriminate between IGR-treated and untreated diet. Experimental aerial application of the IGR revealed that at <70 g in 4.7 1/ha (1 oz in 0.5 U.S. gal/acre) it effectively controlled spruce budworm populations and afforded foliage protection. These results were comparable with those obtained with Matacil® applied at the recommended rate.

EFFECT OF A NEW MOULT INHIBITOR (EL-494) ON THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1979 ◽  
Vol 111 (7) ◽  
pp. 847-850 ◽  
Author(s):  
Arthur Retnakaran
Keyword(s):  
Growth Regulator ◽  
Laboratory Tests ◽  
Choristoneura Fumiferana ◽  
Field Tests ◽  
Spruce Budworm ◽  
Insect Growth Regulator ◽  
Control Agent ◽  
Uv Degradation ◽  
Good Potential ◽  
Greenhouse Tests

AbstractIn laboratory tests on the spruce budworm, Choristoneura fumiferana (Clemens), EL-494®, a new moult-inhibiting insect growth regulator, was found to be more active than Dimilin. The EC50 determined by diet tests was 0.205 ppm for the 3rd, 0.249 for the 4th, 0.287 for the 5th, and 0.486 for the 6th instars. Stadial sensitivity was not detected.In greenhouse tests this compound was found to be resistant to leaching and UV-degradation; the compound remained active on spruce foliage for at least 15 days. In preliminary field tests EL-494 showed good potential as a control agent.

Environmental degradation of the insect growth regulator methoprene

1975 ◽  
Vol 5 (3) ◽  
pp. 233-241 ◽  
Author(s):  
Gary B. Quistad ◽  
Luana E. Staiger ◽  
David A. Schooley
Keyword(s):  
Environmental Degradation ◽  
Growth Regulator ◽  
Insect Growth Regulator ◽  
Insect Growth

FACTORS AFFECTING ADULT EMERGENCE AND MATING BEHAVIOR OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1975 ◽  
Vol 107 (9) ◽  
pp. 967-977 ◽  
Author(s):  
C. J. Sanders
Keyword(s):  
Field Experiments ◽  
Choristoneura Fumiferana ◽  
Adult Emergence ◽  
Spruce Budworm ◽  
Field Conditions ◽  
Continuous Illumination ◽  
Degree Days ◽  
Factors Affecting ◽  
Eastern Spruce Budworm ◽  
Duration Of Copulation

AbstractLaboratory and field experiments indicate that the female spruce budworm (Choristoneura fumiferana (Clem.)) pupal stadium requires approximately 122C degree-days above a threshold of 7.2 °C (45°F), the male 124. Emergence time on any given day depends on temperature but is independent of photoperiod. Under field conditions male and female budworm mate only once per 24-h period. In the laboratory under continuous illumination females mate repeatedly and males readily mate a second time within a few hours, but the duration of the second copulation is abnormally long. The probability of multiple matings under field conditions is reduced by the restricted period of sexual activity coupled with the duration of copulation and the lower competitiveness of mated insects. Antennae are essential to the male for successful copulation.

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