[CANUFNET] Tree "Sexism" in Canada: Call for information & thoughts

Wed Mar 4 16:28:12 EST 2020

Just as an addendum,  ideally we should be encouraging native pollinators,
and not necessarily European imported honeybees.

A study of two species of native solitary bees in Toronto found that they
actually gathered most of their pollen resources from clover and from two
wind-pollinated tree species (*Quercus* and *Betula*) rather than insect
pollinated trees.

https://www.yorku.ca/bugsrus/resources/publications/2014%20MacIvor,%20Cabral%20and%20Packer.pdf

For general pollinator support, trees that produce plenty of both pollen
and nectar include maple (*Acer*), horse chestnut & buckeye (*Aesculus*),
and linden (*Tilia*).

[image: Edmonton_sig_RGB_S.jpg]

Mike Jenkins

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On Wed, 4 Mar 2020 at 13:45, owen croy via CANUFNET <canufnet at list.web.net>
wrote:

> Most trees used in urban hard surface areas do not produce enough fruit to
> be bothersome in the way that has been described.  e.g. elms, maples, oaks,
> iron-wood, ornamental cherries and plums, beech, hornbeam, Korean dogwood
> etc
>
> Many ornamental trees that produce fruit can and should be used in park
> settings and people's where there are no hard surfaces to become
> sticky/slippery/smelly, as they provide food for birds and look gorgeous
> when in bloom. Examples would be hawthorns, crab apple, some dogwoods, etc
>
> Nut-bearing trees should also be considered for park spaces and yards, as
> they can provide food for both animals and humans, and don’t impact people
> negatively when planted away from hard surface areas.
>
> Edible fruit-bearing trees should be planted by home-owners  and in
> community garden areas to be ‘slow’ food sources that do not have to be
> transported and can be picked ripe and consumed fresh.
>
> Most conifers planted as ornamentals have both sexes on the same tree
> (dioecious) so sex selection is not an issue.  However, those that produce
> large cones should be planted in garden beds to prevent nuisance issues
> from arising.
>
> Here in the coastal areas of British Columbia, pollen from native trees
> such as black cottonwood, growing in ravines and other natural areas, fills
> the air in the spring, probably in greater volumes than produced by
> non-native urban trees.
>
> We want to encourage pollinators, not discourage them, so plant females
> that flower!  As always, plant trees that are suitable for the spaces in
> which they will grow to maturity.
>
> Owen Croy
>
> On Wed, 4 Mar 2020 at 07:04, Rebecca Seltzer via CANUFNET <
> canufnet at list.web.net> wrote:
>
>> Hello everyone,
>>
>>
>>
>> We at Tree Canada just received some questions from a reporter at the
>> Guardian, and I thought it would be good to share with the wider urban
>> forestry community. Please do contact Ally Hirschlag directly with your
>> comments.
>>
>>
>>
>> *Context:*
>>
>> “Male trees are cleaner and easier to manage than female trees. Unlike
>> their female counterparts, distinctly male plants produce pollen but do not
>> produce seeds, pods and fruit, which fall to the ground and create mess.
>> Female trees also attract pests, including bees, because they provide a
>> source of food.” Source
>> <https://globalnews.ca/news/5403667/botanical-sexism-climate-change-asthma-allergies/>
>>
>>
>>
>> “Commercial horticulture produces vast numbers of all-male clonal
>> selections from dioecious plants […] Close to 100% of all the ash (
>> *Fraxinus)*, poplar (*Populus), *pistache *(Pistacia), *bay laurel *(Laurus),
>> *junipers* (Juniperus), *willows* (Salix), *gingko tree *(Gingko), *
>> Griselinia* (Griselinia), *mulberries* (Morus), *yellowwood*
>> (Podocarpus), *locust* (Gleditsia) *and logwoods *(Xylosma) *sold are
>> clonal males.” Source
>> <https://books.google.ca/books?redir_esc=y&id=pAJCDwAAQBAJ&q=clonal+males#v=snippet&q=clonal%20males&f=false>
>>
>>
>>
>> *The questions:*
>>
>>    - In Canada, has there been a significant proportion of entirely male
>>    trees or male clones planted in urban areas? Why has this trend been
>>    perpetuated?
>>    - Has this caused an uptick in pollen dispersal in urban communities?
>>    - Do you know of specific communities in Canada looking to lower
>>    their pollen count by adding more female trees and/or less allergy-causing
>>    pollinators?
>>    - What else are communities in Canada doing to combat worsening
>>    allergies in urban or suburban areas due to high tree pollen counts?
>>
>> *Contact information:*
>>
>> Ally Hirschlag
>>
>> ally.hirschlag at gmail.com
>>
>> 2013144322
>>
>>
>>
>> Thank you all!
>>
>>
>>
>> [image: TreeCanada Logo]
>>
>> *Rebecca Seltzer*
>>
>> Program Assistant | Assistante de Programme
>> treecanada.ca  arbrescanada.ca
>>
>> [image: Like Us On Facebook] <https://www.facebook.com/TreeCanada/>[image:
>> Follow Us On Instagram] <https://www.instagram.com/treecanada/>[image:
>> Follow Us On Twitter] <https://twitter.com/treecanada>
>>
>> *Donate*
>> <https://cause2give.unxvision.com/EDMWeb/DonationForm.aspx?FormID=5&LanguageID=1>*
>> | **Plant  with Tree Canada* <https://treecanada.ca/plant-with-us/>
>> *Faites un don*
>> <https://cause2give.unxvision.com/EDMWeb/DonationForm.aspx?FormID=5&LanguageID=2>*
>> | **Plantez avec Abres Canada*
>> <https://arbrescanada.ca/plantez-avec-nous>
>>
>>
>>
>>
>>
>

-- 

[image: Edmonton_sig_RGB_S.jpg]

Mike Jenkins

PEST COORDINATOR
ANIMAL CARE & PEST MANAGEMENT

CITIZEN SERVICES  |  COMMUNITY STANDARDS & NEIGHBOURHOODS

780-496-6395  OFFICE

780-918-7731  MOBILE

CITY OF EDMONTON

PEST MANAGEMENT

12312 - 107 ST

Edmonton AB T5G 2S7

All information contained in this email post is proprietary to the City of
Edmonton, confidential and intended only for the addressed recipient. If
you have received this post in error, please disregard the contents, inform
the sender of the misdirection, and remove it from your system. The
copying, dissemination or distribution of this email, if misdirected, is
strictly prohibited.

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