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.
Insects may be the cause of yellowed leaves on pepper plants. The most common culprits are root knot nematodes, aphids, whiteflies and spider mites. While the root knot nematodes may not be visible because they affects the roots, in severe cases they may cause pepper plants' foliage to yellow and stunt growth.