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.
Here are the most common reasons for yellowing leaves: 1  Normal aging. 2  As many plants age, the lower leaves will turn yellow and drop off as a normal part of growth.3  This is especially true of foliage plants like dieffenbachia and dracaena. 4  In this case, don't worry.ellowing leaves can be caused by a number of conditions. If the cause is obvious, you can fix it immediately. If the cause isn't so obvious, try changing one thing at a time until you fix it. Even after you correct the problem, however, it's likely that yellow leaves will fall off with time.