Efficacy of Two Bole-Injected Systemic Insecticides for Protecting Douglas-Fir From Damage by Douglas-Fir Tussock Moth and Fir Coneworm

Cook, Stephen P.; Sloniker, Benjamin D.; Rust, Marc

doi:10.5849/wjaf.13-002

Cited by 2 publications

(1 citation statement)

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“…Periodic outbreaks of O. pseudotsugata occur every 8 to 12 years when natural controls are unable to keep the population in check and can last 2 to 5 years, with defoliation contributing to growth loss, weakened trees, top-kill and tree mortality over large areas [5][6][7]. During an outbreak, suppression of O. pseudotsugata can be achieved with applications of chemical or microbial insecticides [5,8], bole-injected systemic insecticides [9], insect growth regulators [10], or mating disruption pheromones [7,11].…”

Section: Introductionmentioning

confidence: 99%

Impact of Biochar on Douglas-Fir Tussock Moth (Orgyia pseudotsugata Lepidoptera: Erebidae) Larvae Reared on Synthetic Diet

Rice-Marshall

Cook

Randall

2021

Insects

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The use of biochar as a soil amendment in forest ecosystems can be beneficial in the restoration of degraded soils. Forest insects such as the Douglas-fir tussock moth, Orgyia pseudotsugata (McDonnough) (Lepidoptera: Erebidae), may be exposed to biochar when the material is applied. Two experiments were conducted using biochar either (1) applied to the surface of the diet at three rates (0, 5, and 10 mg) or (2) incorporated into synthetic diet at four rates (0, 10, 20, and 40% volume/volume). The objective of both experiments was to determine if biochar on the surface or incorporated into a synthetic diet affected development and survival of O. pseudotsugata larvae. In both experiments, there was a significant decrease in estimated time to larval mortality in all biochar treatments compared to untreated controls. In the surface-applied biochar experiment, there was a significant difference in larval weight gain at day 12 between the control and 10 mg biochar treatments. In the experiment with biochar incorporated into the diet, mean larval weight at day 12 was highest in the low (10%) biochar treatment compared to all other treatments, although weight gain was only significantly different between the low- and high-concentration (40%) biochar treatments. Our results suggest that larvae, feeding on a low amount of biochar in the synthetic diet, may respond by engaging in compensatory feeding behavior. Fewer surviving larvae in the biochar treatment groups may contribute to the lack of significance found in the comparison of weight gain at day 24 in each experiment.

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Section: Introductionmentioning

confidence: 99%