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 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.
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.
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.
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.
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.
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.
The fungal spore and pollen levels were generally low with the exception of a small spike for Pleospora, an allergenic spore that shares antigens with Alternaria and Stemphyllium. The low temperatures and rain would have contributed to the dearth of air spora.
The copious rain that fell over much of the Western Cape during the last week, washed fungal spores and pollen from the atmosphere. However, intermittent moderate levels of ascospores were seen.
The fungal spore rose in response to rain as ascospore levels increased. Some early winter pollen grains are appearing, such as daisy and cypress tree pollen, but these are present in low numbers.