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Final Pollen Count

Grass counts are moderate but grasses levels are decreasing at this sampling site. Tree and weed pollen counts are low. The fungal spore levels are similarly low.

Pollen counts have ended in Cape Town. It is hoped that sampling will continue in the spring months of 2017.

Grass counts continue to trend

Grass counts were consistently high throughout this spring period. Tree pollen levels were low, but there was a great variation in the pollinating trees. Weed pollen levels were low, as were fungal spore levels.

High grass, Alternaria and Epicoccum levels

High counts were consistently observed for grasses, Alternaria and Epicoccum during this sampling week. Tree pollen levels are diminishing but there is great variation in the flowering tree species. The pollen taxa include: cypress, pine, plane, gum, oak, olive and karee. Weed pollen levels are increasing as Erica, goosefoot, Parietaria, daisy and plantain pollinate.

High grass counts in Cape Town 2016

High grass levels were recorded on all sunny days during this sampling period. Rain washed pollen from the air for a short period and this would have offered relief to hay fever sufferers. Tree pollen levels have decreased, but many allergenic trees are still pollinating. Cypress, pine, plane and olive tree pollen was seen in low numbers. Weed pollen levels were low as were fungal spore levels, with the exception of Pleospora. This fungal spore is similar to Alternaria and Stemphyllium with which it shares antigens.

Grass pollen levels increase

Grass pollen levels continued to increase during the recent sampling period. Moderate levels for grasses were seen for every day without rain. Tree pollen levels were low but varied as cypress, plane,pine, olive and oak trees continued to pollinate. Weed  pollen and fungal spore levels remained low.

Grasses start their pollinating cycle

Grass pollen was moderate during the last sampling period at this site and was a constant present in the atmosphere on days without rain. Flowering grasses included wild oats, Italian Rye, winter grass and Bermuda grass. Tree pollen was inhibited by rain but cypress, elm, gum, oak, pine and plane trees are all pollinating. High fungal spore levels were seen, largely due to the high levels of ascospores after rain and Pleospora.

Trees begin to pollinate

Pine, plane, oak and cypress trees have begun their spring pollinating cycle. Rain is depressing the levels at times but on warmer days, significant levels are being seen. Weed and grass pollen levels are still low. Fungal spore levels fluctuate, according to temperature and precipitation, but are generally low with moderate spikes for ascospores.

Wet winter weather washes air spora from the air

The pollen and fungal spore counts all remained below the significant threshold during the recent sampling period. Rain regularly removed pollen and fungal spores from the ambient air. However, the constant low background presence of Cupressaceae (cypress pollen) as well as the small increases in Pleospora and Cladosporium indicate that seasonal changes are at play and that night temperatures are increasing.

Late winter levels

Trees are beginning their pollinating cycle. Cypress and pine tree pollen grains are appearing in the atmosphere in increasing numbers. Pleospora continues to dominate the fungal spore load and ascospore levels increase after rainfall so there has been a constant present of ascospores in the air for the past three weeks.

Low air spora levels

The most recent sampling period was extremely cold with rain. These conditions would have inhibited the proliferation of fungal spores. Pollen levels were similarly low, but the appearance of  Cupressaceae (cypress tree) pollen signals the approach of the end of winter.