Weekly Report

24 September 2021

City
Overall Risk
Tree Pollen
Grass Pollen
Weed Pollen
Mould Spores

Summary

High tree pollen counts were again seen in Cape Town (cypress, pine, gum and plane tree), Bloemfontein (hackberry, mulberry and plane tree) and Johannesburg (birch, plane and mulberry). Grass counts remain low across most of the country, but slightly higher in Bloemfontein. Overall Cape Town had the highest pollen index. Moulds / fungal spore counts were low at all sites.

Cape Town

High tree pollen levels, moderate weed levels and low grass levels were detected at this site. The dominant tree pollens were cypress (Cupressaceae) and pine (Pinaceae), while significant counts for plane (Platanus sp.) and gum (Myrtaceae) were also seen. Other tree pollen found included acacia (Acacia sp.), cedar (Cedrus sp.), hackberry (Celtis sp.), the pea family (Fabaceae), mulberry (Moraceae), olive (Oleaceae), yellowwood (Podocarpus sp.), poplar (Populus sp.), oak (Quercus sp.), karee (Rhus sp. / Searsia sp.), willow (Salix sp.) and elm (Ulmaceae). Weed pollen detected included the daisy family (Asteraceae), the carnation family (Caryophyllaceae), sedges (Cyperaceae), goosefoot (Chenopodiaceae), erica (Ericaceae), spurges (Euphorbiaceae), protea (Proteaceae), knotweed (Polygonaceae), buttercups (Ranunculaceae), the rose family (Rosaceae), English plantain (Plantago sp.) and nettles (Urticaceae). Mould levels were low.

Johannesburg:

High tree pollen levels were seen again during this sampling week as birch (Butulaceae), bushwillow (Combretaceae), cypress (Cupressaceae), Australian pine (Casuarina sp.), mulberry (Moraceae), ash (Fraxinus sp.), pine (Pinaceae), yellowwood (Podocarpaceae), plane (Platanaceae), oak (Quercus sp.) and karee (Rhus sp. / Searsia sp.) continued to flower. Plane, ash and mulberry dominated the pollen catch. Low weeds included the daisy family (Asteraceae), goosefoot (Chenopodiaceae), the carnation family (Caryophyllaceae) and erica (Ericaceae). Moulds and grasses were low.

Pretoria

Moderate tree counts and low grass and weed counts were detected. Tree pollen included significant levels of birch (Betulaceae), mulberry (Moraceae) and plane tree (Platanus sp.), with lower levels of hackberry (Celtis sp.), cypress (Cupressaceae), bushwillow (Combretaceae), coral tree (Erythrina sp.), ash (Fraxinus sp.), protea (Proteaceae), gum (Myrtaceae), pine (Pinaceae), yellowwood (Podocarpus sp.), poplar (Populus sp.), oak (Quercus sp.) and karee (Rhus sp. / Searsia sp.). The only weed pollen detected was from the carnation family (Caryophyllaceae) and spurges (Euphorbiaceae). Mould levels were low.

Bloemfontein

High tree pollen levels, moderate grass levels and low weed levels were seen. The dominant tree pollen types were from hackberry (Celtis sp.), mulberry (Moraceae), plane (Platanus sp.) and karee (Rhus sp. / Searsia sp.). Other abundant tree pollens were acacia (Acacia sp.), false olive (Buddleja sp.), cypress (Cupressaceae), waxberry (Morella sp.) and olive (Oleaceae), with low levels of pine (Pinus sp.) also seen. Weed pollen included only the daisy family (Asteraceae), goosefoot (Chenopodiaceae) and erica (Ericaceae). Mould levels were low.

Kimberley

Tree, grass and weed pollen levels declined to low levels during this sampling period. Trees detected were oak (Quercus sp.), karee (Rhus sp. / Searsia sp.), hackberry (Celtis sp.), pine (Pinaceae), mulberry (Moraceae) and cypress (Cupressaceae). Weeds included the daisy family (Asteraceae), pellitory-of-the-wall (Parietaria sp.) and knotweed (Polygonaceae). Moulds were extremely low.

Durban

Grass, tree and weed pollen levels were low during this sampling period. Tree pollen included acacia (Acacia sp.), the sumac family (Anacardiaceae), cypress (Cupressaceae), mulberry (Moraceae), plane (Platanaceae), pine (Pinaceae), Australian pine (Casuarina sp.), hackberry (Celtis sp.), bushwillow (Combretaceae), cypress (Cupressaceae), mulberry (Moraceae), gum (Myrtaceae), olive (Oleaceae), plane (Platanus sp.), yellowwood (Podocarpaceae) and oak (Quercus sp.).Weeds detected were erica (Ericaceae), spurges (Euphorbia sp.), fern spores (Polypodiaceae), knotweed (Polygonaceae), sorrel (Rumex sp.) and nettles (Urticaceae). Mould counts were low.

Port Elizabeth

Grass, tree, weed and mould levels were all low during this week. Trees detected included acacia (Acacia sp.), Australian pine (Casuarina sp.), cedar (Cedrus sp.), cypress (Cupressaceae), waxberry (Morella sp.), gum (Myrtaceae), olive (Oleaceae) and pine (Pinaceae). Weeds detected were sedges (Cyperaceae), the daisy family (Asteraceae), mugwort (Artemisia sp.), katstert (Anthospermum sp.), the carnation family (Caryophyllaceae), spurges (Euphorbiaceae) and erica/heather (Ericaceae). Moulds were low.

 

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