EFFECTS OF THE JUVENILE HORMONE ANALOG FENOXYCARB ON VARIOUS DEVELOPMENTAL STAGES OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (CLEMENS) (LEPIDOPTERA: TORTRICIDAE)

1992 ◽  
Vol 124 (1) ◽  
pp. 117-123 ◽  
Author(s):  
Barry J. Hicks ◽  
Roger Gordon
Keyword(s):  
Juvenile Hormone ◽  
Developmental Stages ◽  
Early Stage ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Larval Stages ◽  
Eastern Spruce Budworm ◽  
Adult Females ◽  
Juvenile Hormone Analog ◽  
Hormone Analog

AbstractThe effectiveness of topical applications of the juvenile hormone analog Fenoxycarb against selected developmental stages of the eastern spruce budworm, Choristoneura fumiferana (Clemens), was determined. Eggs at an early stage of embryogenesis (0–24 h old) were prevented from hatching and were more sensitive to the compound than older eggs (48–72 h old) and larval stages. Fifth-instar larvae displayed lethal morphogenetic effects following Fenoxycarb treatment, but third-instar larvae were refractory. Adult females constituted the most sensitive stage; treated insects laid eggs that failed to hatch. Untreated adult females that mated with Fenoxycarb-treated males also laid infertile eggs.

TOXIC EFFECTS OF A COMMERCIAL FORMULATION OF FENOXYCARB AGAINST ADULT AND EGG STAGES OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (CLEMENS) (LEPIDOPTERA: TORTRICIDAE)

1995 ◽  
Vol 127 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Roger Gordon
Keyword(s):  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Egg Hatch ◽  
Commercial Formulation ◽  
Eastern Spruce Budworm ◽  
Juvenile Hormone Analog ◽  
Hormone Analog ◽  
Water Based ◽  
Droplet Sizes ◽  
Egg Stages

AbstractGreenhouse trials were conducted to evaluate the effect of treating adult and egg stages of the eastern spruce budworm, Choristoneura fumiferana (Clemens), with Insegar, a water-based commercial formulation of the juvenile hormone analog fenoxycarb, or with water (controls) at droplet sizes and densities comparable to what would be achieved through aerial spraying of field populations. When adult moths were sprayed with the juvenoid at dosages equivalent to 15.5, 155.4, and 310.8 g AI/ha, approximately 90% of the eggs that were subsequently oviposited failed to hatch. The efficacy of the compound (60% suppression of egg hatch) was not as high when the egg stages were sprayed directly at 15.5 and 155.4 g AI/ha. Insegar did not affect the egg productivity of the moths.

A METHOD FOR REARING THE LARVAL STAGES OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA CLEMENS (LEPIDOPTERA: TORTRICIDAE), FOR PHYSIOLOGICAL STUDIES

1990 ◽  
Vol 122 (6) ◽  
pp. 1271-1272 ◽  
Author(s):  
Hemendra Mulye ◽  
Roger Gordon
Keyword(s):  
Population Dynamics ◽  
North America ◽  
Choristoneura Fumiferana ◽  
Insect Pest ◽  
Spruce Budworm ◽  
Forest Pest ◽  
Forest Insect ◽  
Larval Stages ◽  
Eastern Spruce Budworm ◽  
Physiological Studies

The eastern spruce budworm, Choristoneura fumiferana Clemens, is the most widely distributed and destructive forest insect pest in North America. Although much is known about the ecology, population dynamics, and impact of C. fumiferana on tree growth (Sanders et al. 1985), there is very little information available on the physiology of this forest pest. Physiological studies are crucial to the development of novel strategies for spruce budworm control.

EFFECTS OF SELECTED JUVENILE HORMONE ANALOGS ON SIXTH-INSTAR LARVAE OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA CLEMENS (LEPIDOPTERA: TORTRICIDAE)

1989 ◽  
Vol 121 (12) ◽  
pp. 1111-1116 ◽  
Author(s):  
Hemendra Mulye ◽  
Roger Gordon
Keyword(s):  
Juvenile Hormone ◽  
Choristoneura Fumiferana ◽  
Subsequent Development ◽  
Control Program ◽  
Spruce Budworm ◽  
Control Potential ◽  
Eastern Spruce Budworm ◽  
Hormone Analogs

AbstractThe effectiveness of seven insect juvenile hormone analogs (JHAs) in disrupting metamorphosis of the eastern spruce budworm, Choristoneura fumiferana Clemens, was determined by applying the compounds topically to early sixth-instar larvae and monitoring subsequent development. Fenoxycarb showed promising control potential, with an LC50 of 0.26 μg per insect. Relative lethal effectiveness, based on LC50 values, was Fenoxycarb > ZR9892 > ZR8487 > S-71639 > methoprene > ZR9582 > ZR10151. Some of the JHAs tested may be useful in an integrated spruce budworm control program.

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