I see this egg on cannabis leaves all the time but have never found an insect to correlate it to. This egg is MUCH smaller than the common spider mite egg; although they are both perfectly spherical this eggs seems to have some texture to it while spider mite eggs are smooth. Also, this egg appears in high concentration on sick plants and in lower/minimal concentration on healthy plants. I've tried hatching it out with no success but maybe my hatching techniques are not good. I am using a breathable tissue culture jar with a wet cotton ball to keep humidity up and incubating at approximately 70. I check leaves every couple days with no success.