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Very high grass and fungal spore levels
During the past sampling week, rain occurred, providing ideal conditions for the proliferation of fungal spores. The warm, moist atmosphere favoured increases in fungal growth and Alternaria levels were very high (>200 spores/ cubic metre. Grass counts were high at both sites on days without rain. Rust spores increased. Tree pollen levels declined at both sites and weed pollen levels were consistently low.
High Grass pollen Counts
Grass pollen levels are now high at both sites on days without rain. The mean count is lower (moderate) at the Observatory site, but during the past sampling week grasses reached counts of up to 177 grains/cubic metre air. Tree pollen levels are decreasing, but pine, gum, olive cypress, Rhus (Karreeboom) and plane pollen grains are still present in low quantities. Weed pollen fungal spores are low. Spikes for Alternaria and Cladosporium were recorded after rain.
Grass Levels
Grasses are now pollinating in full force and grass pollen levels were consistently high in Table View. Intermittent rain washes pollen grains from the air, so this should afford hay fever sufferers some relief. Tree pollen is abating, but occasional moderate counts are still being recorded for olive, pine, oak, plane and gum trees. Weed pollen levels are low. High counts for Alternaria, an allergenic fungal spore were recorded at the Observatory (inland) site.
Grass pollen levels
The grass season is in full swing and moderate to high counts are being seen at both sites on days without rain. The tree season is waning but low levels of cypress, oak, olive, plane, pine and gum are still present in the atmosphere. Weed pollen levels are low. The total fungal spore level has decreased, but high levels are being measured for Alternaria, an allergenic fungal spore.
Tree and grass seasons overlap
The tree pollen season is waning, but moderate levels for plane, pine, cypress and gum were recorded during this sampling period. Grass pollen levels were higher on days without rain and weed pollen levels were consistently low. The fungal spore loads are heavier and Alternaria and Cladosporium levels increased during this sampling period.
Spring rain in the Cape helps allergy sufferers
The recent rain in Cape Town has scrubbed airborne pollen and fungal spores from the atmosphere, but it must be noted that as soon as the sun has dried pollinating grasses and trees, the pollen count will increase rapidly. Fungal spore levels will also increase following rain as many fungi prefer warm, moist conditions.
Oak, plane pollen counts in Cape Town
Oak and plane trees are now pollinating in earnest and pollen counts are moderate to high in inland areas. Other tree pollen in the atmosphere includes cypress, gum, olive, pine and willow. Grass pollen levels are low, bu approaching the significant threshold. Weed levels are low, but weed pollen (Fat hen, daisy) is evident at the coastal site. Fungal spore levels increase sharply after rain as ascospore levels rise on sunny days.
This website is currently being altered. Please be patient while this is being carried out. Spring pollination is under way as the trees move into their annual pollination cycle. Flowering trees include:- cypress, pine, olive, fig, mulberry, gum and poplar.
Cape Town Aerospora
The low temperatures and heavy rains that have fallen during this sampling period have depressed both the pollen and fungal spore levels. Early spring pollen taxa (cypress, olive and pine) that was appearing in the atmosphere has disappeared. Similarly, fungal spore levels have declined in response to temperatures that have fallen below their optimum range.
Snow on Cape mountains
The prolonged cold weather has depressed all pollen and fungal spore levels at both sites, with the exception of ascospores at Table View and Moraceae at the same site. It is clear that tree pollen is set to increase as soon as temperatures rise.