Weekly Report

20 March 2020

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

Cape Town

Grass pollen levels were very low during this period. Trees were similarly low and only white stinkwood (Celtis) was detected. Weeds were also low, consisting of goosefoot and the daisy family. Moulds were very low.

Johannesburg

Grass concentrations were higher throughout this sampling week occurring at the rate of >20 per day. Trees were very low and included the types: cypress, pine, eucalyptus and birch. Weeds were low and only goosefoot and the daisy family were detected. Moulds were low.

Pretoria

Grass concentrations were moderate to high throughout the week again occurring at the rate of >10 per day.  Trees were low but diverse and included jacaranda, white mulberry and bush willow. Low weed concentrations included: goosefoot and the daisy family. Moulds were low.

Bloemfontein

Grass counts were high, tree and weed pollen in the air was low and fungal spore loads were generally moderate again excepting the fungal spore Alternaria. High levels were consistently detected for this mould/fungal spore. Weed levels were low and only English Plantain and goosefoot were detected.

Kimberley

The grass level was high despite rain on four of the sampling days. Tree and weed pollen levels were very low. One eucalyptus (gum) and one kareeboom (Rhus/Searsia) pollen grain were detected. Weeds were also extremely low, with just one fern spore seen in the atmosphere. Moulds were low but ascospore levels increased after rain.

Durban

Grass levels were high, having increased since last week. Tree loads were also high, exceeding the critical limit. Moderate birch and low Eucalyptus counts were recorded. Weed levels were low, with ragweed absent for the first time in several weeks. Moulds were low relative to last week.

Port Elizabeth

The grass pollen level was extremely low, as was the tree level. Tree types detected were white stinkwood and waxberry. No weed pollen was detected throughout the week. Mould levels were generally low, but a strong spike for ascospores was seen

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