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.
Additional Considerations. Older leaves on the corn plant will naturally turn yellow and eventually drop off of the plant, so there is no cause for concern if this is the case. Excessive or improperly applied fertilizer can cause leaf tips and margins to turn yellow or brown. Low humidity can cause dry tips and edges.assangeana is a cultivar of Dracaena fragrans, commonly known as corn plant because of its narrow, arching foliage that resembles the leaves of a corn plant. Massangeana features a large yellow stripe down each leaf center.