Weekly Report

31 July 2020

City
Overall Risk
Tree Pollen
Grass Pollen
Weed Pollen
Mould Spores
Cape Town
Johannesburg
Bloemfontein
Durban
Pretoria
Port Elizabeth
Kimberley

Cape Town

Low levels of grass, tree and weed pollen were detected during this sampling week but the tree pollen is showing a slight increase especially for cypress and olive. Rhus/Searsia, mulberry and gum were also detected and Erica alone represented the weeds. Moulds were low.

Johannesburg

Grasses were low to moderate. Trees were high as significant levels were observed for cypress. Plane were low but are increasing and gum, Casuarina and Rhus/Searsia were low. Weeds were low but varied and included the daisy family, goosefoot, ferns, Euphorbia and Erica.

Pretoria

Grasses were low. Low tree pollen levels included cypress and pine. Only Stroebe represented the weeds which were also low. Moulds were very low indeed.

Bloemfontein

Grasses were very low during this sampling period, but activity was noted in the category of trees as cypress began its pollen release season and this taxon reached moderate levels at times. Low levels of olive were detected. Only Stoebe and Euphorbia were seen in the weed category and moulds were almost uniformly low. One small spike was seen for Cladosporium.

Kimberley

No grass pollen was detected at this site. Tree pollen was low but cypress and Rhus/Searsia pollen was detected in low numbers and weeds were very low and represented by just one Stoebe (slangbos) pollen grain. Moulds were very low but the constant low presence of Alternaria was noted.

Durban

The grasses were very low at this site. Tree pollen was scanty but pine, palm, Rhus/Searsia and cypress was detected in low numbers. Weed pollen types included only nettle. Moulds were low.

Port Elizabeth

Grasses were low during this sampling period. Tree pollen was low and included gum, pine, Casuarina and Anacardiaceae (the mango and cashew family). Weeds were low but showed much variation as the daisy family, sedges, Erica, Euphorbia, lilies, Protea, Artemisia (mugwort) and Caryophyllaceae (the pink or carnation family) all released pollen. Moulds were low but ascospores and Basidiospores showed small spikes indicating rain had fallen.

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