Beet Curly Top Virus (BCTV) is a cannabis plant disease that may cause curling, twisting leaves, yellowing, and stunting. Often spread by leafhoppers.
Plant Problems Symptoms: Spots or markings
This picture is often misdiagnosed as Leafhoppers but it is cannabis leaf damage of a four-lined plant bug (Poecilocapsus lineatus), which make spots in clusters.
Planthoppers can attack and infest cannabis, leaving a unique cotton-like growth while they suck the life out of your plants! Planthoppers also spread plant diseases, so you want them away from your plants as soon as possible. Example of leaf damage from planthoppers. (Thanks to George4green for several of the awesome planthopper pics) Melanoliarus planthopper
Manganese deficiency can cause cannabis leaves to become yellow in between the veins, with mottled brown spots on the affected leaves. Learn how to treat it!
Tobacco mosaic virus causes strange mottling symptoms in the leaves, slow growth and reduced yields. Learn how to identify and treat TMV for good!
Cannabis leaf edges and tips turning yellow? Copper deficiency can cause dark, shiny leaves with purple or blue undertones. Learn how to spot and treat it!
Nutrient burn causes the tips of cannabis leaves to turn yellow or brown. The burnt tips are the result of too-high levels of nutrients. Learn how to fix it!
Discover how to finally beat root rot (brown or slimy roots) for good! The secret to curing and prevention is a supplement with a particular type of bacteria!
Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.
Boron deficiencies are rare and appear as brown blotches in the center of leaves. See what a cannabis boron deficiency looks like and learn how to treat it!