Common insects that hurt and may kill your indoor plants as well as outdoors are thrips, mites, whiteflies, fungus gnats, budworms, and caterpillars. Mites are mostly seen in indoor grow rooms. While outdoor growers generally find that leaf-eating insects like caterpillars and budworms are their most threatening insect pests. Mites are tiny, mobile, and vicious. They travel from grow room to grow room . From the bodies and clothes of people who have come in contact with mites or were in other grow rooms. Mites live in nature as well as on dogs. Approximately 65% of indoor grow rooms are infected with mites. Mites puncture leaves and feed on plant juices.


Thrips are larger than Spider Mites with a more linear body shape. They feed on leaves and create white to yellowish marks on them.However the marks are closly together and solidly discolored than those left by mites. Thrips also leave black fecal debris on leaves.

Spider mite

Spider mites are common pest problems in plants in grow rooms and outdoors. Injury is caused as the mite feed, bruising the cells with their small, whiplike mouth and ingesting the sap or plant juices. Damaged areas appear marked with many small, light flecks, giving the plant a somewhat speckled appearance. Following severe infestations, leaves become discolored, producing a gray or bronze look to the plant. Leaves may ultimately become scorched and drop prematurely. Spider mites kill plants or cause serious stress to them, and we all know stress effects the flower!


Whiteflies are very easily seen than thrips or Spider Mites because they fly around plants. They are more prone when plants are shaken by gardeners. Whiteflies are pure white, and are about the size of the head of a ball point pen. Whiteflies drink plant juices or sap and leave residue on plant surfaces that provides sustenance for harmful fungi.


Budworms effect mainly outdoor grows and burrow into ripe flower clusters. Budworms also spin webs around flower clusters. They feed on flower clusters starting from the inside out. Their meals provide a vector for a pervasive fungal disease known as Botrytis or Gray Mold. Leaf-eating caterpillars are less hard to find than budworms because they spend all most all of their time on leaves. They tend to manipulate leaves before feeding on them. Leaf eating caterpillars feeding habits include eating small sections of leaf in between leaf veins, or just eating large chunks of leaf.

Fungus gnats

Fungus gnats and simlar species such as the crane fly all effect the soil and feed on the roots. Causing a decrease in the plants’ ability to take nutrients during feeding. Gnats are tiny and dark.

Viruses and bacteria

Viruses affect plants, not just people and animals.Some viruses can even jump from people to plants and visversa . Among the most seen viruses are “streak” and “mosaic” . These are viruses that cause swirling white and yellow discolorations on leaves. The discolorations are almost artistic however the leaves will wilt. There are several species of bacteria also known to attack Cannabis. Most of these bacteria manifest themselves as “blight” diseases that create spots on leaves, wilting, rotting, weak stems, and rapid decay of harvested material.While growing plants it is very import to research all the Viruses and bacteria to know that you are looking for.

Leave a Reply

Your email address will not be published. Required fields are marked *