Lung VQ Scan. Also known as lung or pulmonary ventilation (V) and perfusion (Q) scans. A lung VQ scan is an imaging test that uses a ventilation (V) scan to measure air flow in your lungs and a perfusion (Q) scan to see where blood flows in your lungs. It uses special x ray scanners outside of your body to create pictures of air and blood flow patterns in your lungs.
Yellow leaf spot, also known as leaf septoria, are caused by Septoria cannabis and S. neocannabina. These are fungal pathogens aimed specifically at marijuana plants. It is brought about by warm weather and rain and effect marijuana grown outdoors.
Tropical house plants need moisture, light and air to thrive. If any one of these factors gets out of balance, trouble occurs. Too much moisture can cause leaf spot and tip burn. Too much direct sunlight can blister the leaves. Too little air can cause the leaves to remain too moist, causing fungus to grow. Indoor plants generally prefer moist conditions with very little direct sunlight. So do most fungi. Air movement around and through your palm will help the plant's leaves dry off while moving the oxygen produced by the specimen. The dry leaf surface will not harbor fungus.