Weekly Report

15 July 2022

City
Overall Risk
Tree Pollen
Grass Pollen
Weed Pollen
Mould Spores

Summary

Pollen and fungal spore counts were low across South Africa, but tree pollen increased to moderate levels in Johannesburg.

Cape Town

Tree, grass and weed pollen levels were very low during this cold, rainy mid-winter period. Trees detected included the sumac family (Anacardiaceae), cypress (Cupressaceae), gum (Myrtaceae), sweet gum (Liquidambar sp.), yellowwood (Podocarpaceae), pine (Pinaceae) poplar (Populaceae) and waxberry (Morella sp.). Weeds included nettles (Urticaceae), erica (Ericaceae) sedges (Cyperaceae) and sorrel (Rumex sp.). Fungal spore loads were low but a spike was seen for the wet weather spore, Pleospora, which peaks in July.

Calvinia

The grass count was low. The only tree pollen detected was cypress (Cupressaceae) in low quantities. Low weed levels included the daisy family (Asteraceae), goosefoot (Chenopodiaceae), sorrel (Rumex sp.) and nettles (Urticaceae). Moulds were very low.

Johannesburg

Tree pollen increased to moderate levels because of elevated cypress (Cupressaceae) counts. Other tree species were birch (Betulaceae), mulberry (Moraceae), waxberry (Morella sp.), gum (Myrtaceae), yellowwood (Podocarpaceae), oak (Quercus sp.) and elm (Ulmaceae). Low weed pollen included only spurges (Euphorbiaceae) and fern spores (Polypodiaceae). Grasses and fungal spore counts were low.

Pretoria

Grass, weed and tree pollen levels were low. Tree pollen included birch (Betulaceae), Australian pine (Casuarina sp.), cypress (Cupressaceae), plane (Platanus sp.), oak (Quercus sp.) and karee (Rhus/Searsia sp.). The weeds recorded were the daisy family (Asteraceae), goosefoot (Chenopodiaceae), erica (Ericaceae), spurges (Euphorbiaceae) and fern spores (Polypodiaceae). Mould counts were low.

Bloemfontein

Courier delays meant no new data were available. The results from last week are repeated here. Low grass, weed and tree counts were seen. Trees included cypress (Cupressaceae), mulberry (Moraceae), gum (Myrtaceae) the sumac family (Anacardiaceae) and poplar (Populaceae). No weed pollen was detected. Moulds were extremely low.

Kimberley

There were very few pollen grains in the atmosphere during this sampling week. Tree pollen detected included the sumac family (Anacardiaceae) and cypress (Cupressaceae). Grasses and moulds were low and no weed pollen was detected.

Durban

Low grass, tree and weed counts were seen. Trees included the sumac family (Anacardiaceae), cypress (Cupressaceae), karee (Rhus/Searsia sp.), pine (Pinaceae), yellowwood (Podocarpaceae), poplar (Populaceae), gum (Myrtaceae), mulberry (Moraceae) and oak (Quercus sp.). The weeds detected were sedges (Cyperaceae), the daisy family (Asteraceae), plantain (Plantaginaceae), fern spores (Polypodiaceae) and nettles (Urticaceae). Fungal spore levels were low.

Gqeberha

Low grass counts were seen. Low tree loads included the sumac family (Anacardiaceae), bushwillow (Combretaceae), cypress (Cupressaceae), waxberry (Morella sp.), gum (Myrtaceae), pine (Pinaceae) and elm (Ulmaceae). Weeds were low and included the daisy family (Asteraceae), sedges (Cyperaceae) and nettles (Urticaceae). Moulds were very low.

 

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