My marijuana plants were thriving, but then they began showing tiny brown dots on their leaves. The plants seem sad. What’s going on?
When spider mites stick their proboscis in the leaves, they leave tiny brown dots. These creatures are about 1/32-inch long, look like brown/black dots, and can be found on the underside of leaves. If you really watch for a couple minutes, you’ll start to see them moving around. They aren’t technically insects and are related to spiders. They have gigantic families and can reproduce very fast. This allows them to ruin complete marijuana gardens very quickly if they aren’t checked. After the colony has gained in population, the spider mites will start building webs and walking around on them.
To get rid of them, try using pyrethrum at first. Unfortunately, many populations of spider mites are not susceptible to this because it’s been used ad nauseam. If that doesn’t help, try using Cinnamite. It is composed of cinnamon and will kill mites on contact. Many fatty-acid and soap sprays can help a lot as well. Neem oil is also effective.