For the last 5 years plus I've been applying Neem Oil to my plants 2 times a week just as many members here have, there is even a post on some members applying the oil with their watering ...well! relax you were right PROOF at last that adding Neem Oil to your watering can does encourage Cannabis to drink up the oil and is carried by the plant's sap,...sap drinkers try but just can't swallow it ...lol
...here:
A commercial neem formulation containing azadirachtin-A (AZ-A) was applied to the soil around the root system of potted aspen (Populus tremuloides Michx.) plants. The uptake, translocation, persistence and dissipation of the chemical in the plants were studied. The effect of foliar residues of AZ-A on two-spotted spider mite (Tetranychus urticae Koch) populations was also evaluated. The compound was taken up by the root system within 3 h and translocated in the stem and foliage within 3 days, confirming that AZ-A is systemic. The peak concentrations (μg/g, fresh weight) of AZ-A occurred at 10 days post-treatment, and were distributed in roots, stem and foliage in the ratio of 8.1:1.0:2.3, respectively. The rate of dissipation of AZ-A from the matrices was moderately rapid, and the residual concentrations on the last day of sampling (50 days post-treatment) in roots, stem and foliage were in the ratio 2.7:1.0:1.2, respectively. Control of mites by AZ-A residues in foliage was statistically significant, and the bioactivity declined within 30 days. The final residue of AZ-A in the soil after 50 days was about 25% of the initial value, with a half-life of dissipation of about 26 days.
http://www.sciencedirect.com/science/article/pii/026121949500026I
...here:
A commercial neem formulation containing azadirachtin-A (AZ-A) was applied to the soil around the root system of potted aspen (Populus tremuloides Michx.) plants. The uptake, translocation, persistence and dissipation of the chemical in the plants were studied. The effect of foliar residues of AZ-A on two-spotted spider mite (Tetranychus urticae Koch) populations was also evaluated. The compound was taken up by the root system within 3 h and translocated in the stem and foliage within 3 days, confirming that AZ-A is systemic. The peak concentrations (μg/g, fresh weight) of AZ-A occurred at 10 days post-treatment, and were distributed in roots, stem and foliage in the ratio of 8.1:1.0:2.3, respectively. The rate of dissipation of AZ-A from the matrices was moderately rapid, and the residual concentrations on the last day of sampling (50 days post-treatment) in roots, stem and foliage were in the ratio 2.7:1.0:1.2, respectively. Control of mites by AZ-A residues in foliage was statistically significant, and the bioactivity declined within 30 days. The final residue of AZ-A in the soil after 50 days was about 25% of the initial value, with a half-life of dissipation of about 26 days.
http://www.sciencedirect.com/science/article/pii/026121949500026I
