Looks like it's probably thrips.
Thrips
Thrips are really tiny, but can be seen by the naked eye. Some may have wings and some may not. Thrips reproduce rapidly, especially in tight places. That is what makes them hard to get rid of when using pesticides. The suck the sap right out of your plant with there piercing mouths, which makes the leaves look like they turned white. You can tell when you have thrips by taking a look at your leaves, the leaves will look as if there chlorophyll have been ripped right off the plant. Plants that are damaged can’t be healed thus making it harder for the plant to absorb light. SO if left untreated the thrips will kill the plants. Damage also can be seen by the greenish black specks of there poop they leave on leaves. Also the plants will show silver patchs from scar tissue. Depending on the severity at first, thrip damage might look like spider mite damage untill it increases in damage and then thrips case is for sure when you see the greenness replace with big parts of white.Thrips also can causes viruses to the plants and any larvae infected will breed more infected pests!. While they suck, the plants release honeydew which can contribute to mold on your plants.
Adults have wings but do not fly well, but rather jump more. There are different kinds of Thrips, some more resistant to chemicals. Thrips can also carry plant pathogens in there mouths and carry it to other plants increasing the chance for your plants to get infected. . If your plants are affected during late flowering or close to harvest, please try to use the safest means of control to be safe to your health.
Control
One good way to repel thrips for those growing outside is to use garlic, this is a good way to keep them away before you get them. The color yellow attracts the thrips and should be advised not to have this color around your grow.. If you already have them using neem oil, and or lady bugs can get rid of them. If the infestation is bad then you need to use biological solution like, pyrethrin-like insecticides.
Other Products include:
Chemicals
Hot Pepper Wax,Safer Yard & Garden Insecticide (which can be used right to the day of harvest),GNATROL( used in hydro in the water as well as soil),Doc's Neem Pest Soap,Safer Sticky Stakes,TR-11000 Pyrethrum.
Picture 1 is Thrip damage
Picture 2 is Thrip Larvae (Picture Contributed by: Flatt)
