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News and Opinion

Coverage of defoliation since May 4, 2020.

City of Hamilton and RBG aerial spray to reduce Spongy Moth population

"...Spongy Moths are an invasive species that feed on tree leaves and in some cases evergreen needles. The pesticide called BTK doesn't fully remove the caterpillars, it just regulates the population..."

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Guelph tells residents to be aware of spongy moth this spring

"...The city said they're an invasive species, previously known as gypsy moth, that feed off of tree leaves and whose caterpillars cause defoliation. Timea Filer, urban forestry field technologist, said the city recently did a survey and found Guelph's risk of defoliation is mild compared to other cities. “Last year, our risk for the populations of spongy moths was still lower than many of the surrounding municipalities that are having a lot more of an impact,” she said..."

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Forestry industry innovations benefit the environment and our rural regions Montreal Economic Institute

"...We must not ignore the fact that a healthy forestry industry can also maximize the capture of carbon by our forests. This is an important and often overlooked aspect of the fight against climate change, says Miguel Ouellette, Director of Operations and Economist at the MEI. By harvesting mature trees, we prevent them from decaying and releasing into the atmosphere all of the carbon accumulated throughout their lives, and we allow saplings to capture the carbon they need to grow..."

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Watch out, Vancouver the moths are coming

"...Yes, they look terrible. We all love our trees, she said. But the ecosystem is quite capable of bouncing back from this level of defoliation so this is definitely not a mothpocalypse..."

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COVID has been pest in battle against invasive species

"...The summer of 2020 was a challenge for those charged with dealing with invasive species, Ministry of Natural Resources says. While invasive species continued to spread in Algoma, the Invasive Species Centre was forced, due to COVID, to cancel all its public programs, including the annual garlic mustard pull. The Invasive Species Centre team has been “safe and well” and able to work from home throughout the pandemic, said Lauren Bell of the centre..."

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Moth invasion this summer expected to lead to outbreak next year in Kamloops

"...Just before the Inks Lake turnoff south of Kamloops, a reddish-brown blotch of trees is visible in the hills. It is the result of defoliation from a certain type of moth larvae, which eats coniferous tree needles..."

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Natural Resources staff to survey Gypsy moth invasion from air

"...Field staff with the Ontario government are weighing the damage being done in Eastern Ontario by what experts have dubbed the worst Gypsy moth invasion in this corner of the province in 30 years. To gauge the extent of the outbreak, the Ministry of Natural Resources and Forestry is taking to the air to get a bird’s eye view of the damaged forest canopy from the Gypsy moth caterpillar which is munching its way through the province this summer. Gypsy moth caterpillars are voracious eaters and are stripping local foliage of oak, maple and basswood trees as well as white pines in pockets from Belleville to Bancroft and eastward..."

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Tent Caterpillars Are Here… But Don’t Worry, They’re Not The Bad Kind

"...“We often think about the forest tent caterpillar and that is the one that causes the large-scale defoliation of poplar trees,” details Ross. “This other one, this eastern tent caterpillar, doesn’t generally cause that much damage. ”..."

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Sarnia targeting May 20 for gypsy moth spraying

"...The City of Sarnia has hired a company to spray gypsy moth caterpillars in May and June, in a bid to prevent tree defoliation in the city’s north. Zimmer Air Services has been contracted to spray biological pesticide Foray 48B Biological Insecticide Aqueous Suspension, with active ingredient Bacillus thuringiensis v. kurstaki (btk), across 63..."

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Recommended Reading

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Academic Research

Recent peer-reviewed papers about defoliation relevant to the latest news.

Functional stability of vegetation following biocontrol of an invasive riparian shrub

"...We found that community-weighted average trait values, species diversity and functional dispersion changed little in response to defoliation, and instead seemed to be responding to fluctuations in yearly precipitation..."

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Control effect of fungicide pyraclostrobin alternately applied with Bordeaux mixture against apple Glomerella leaf spot and its

"...Apple Glomerella leaf spot (GLS) is caused by Colletotrichum fructicola, which causes severe leaf spot symptoms and leads to early defoliation, resulting in considerable economic losses..."

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Paropsis atomaria larval feeding induces a chemical but not a physical response in Corymbia citriodora subsp. variegata

"...variegata, an important hardwood plantation taxon, to feedings by Paropsis atomaria larvae, a pest that causes severe defoliation in young trees..."

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Reaction-diffusion modeling of the spread of spruce budworm in boreal ecosystem

"...To develop a sustainable management of the boreal ecosystem, mathematical modeling approaches for the budworm outbreak have been progressed..."

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The use of biological liquid fertilizers against oak decline associated with Phytophthora spp.

"...Worldwide, multiple ecosystems are currently affected by global change because of important anthropogenic disturbances which have quickly increased levels of abiotic (e..."

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Multi-generational effects of simulated herbivory and habitat types on the invasive weed Alternanthera philoxeroides: implicati

"...The associations between stem anatomical structural parameters and biomass significantly differed between non-defoliation and defoliation treatments in the simulated aquatic habitat, but not in the simulated terrestrial habitat..."

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Assessment of the Condition of Coniferous Trees in Urban and Suburban Forests of the Krasnoyarsk City

"...In areas with a high and critical level of pollution, a decrease in the decorativeness of evergreen conifers was observed due to defoliation of needles starting from the second year of life..."

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Manatha albipes Moore (Lepidoptera: Psychidae), an emerging pest of banana and arecanut in South India, with notes on diagnosis

"...The larvae feed on the foliage of banana and arecanut and the stem of arecanut by scraping the tissue and cause severe drying and defoliation..."

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Physiochemical responses of Ailanthus altissima under the challenge of Verticillium dahliae: elucidating the decline of one of

"...Inoculated plants showed visible injuries starting from 2 weeks post inoculation (wpi), that progressively developed until a final severe defoliation..."

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The role of natural enemies in regulating the population of the outbreak species Orgyia trigotephras (Lepidoptera: Erebidae) in

"...The outbreak species, Orgyia trigotephras caused significant defoliation in northeastern Tunisia in 2005..."

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Estimation of cotton canopy parameters based on unmanned aerial vehicle (UAV) oblique photography

"...However, there are also some problems of low cotton defoliation rates and high impurity rates caused by unclear spraying amounts of cotton defoliants..."

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Artificial herbivory on Prunus avium: impacts on physiological leaf traits

"...Herbivorous insects from diverse feeding guild cause defoliation with different intensity and dissimilar tissue effects..."

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