EM-1 full strength eats PM for breakfast, lunch and dinner. I have yet to see it return on some bind weed that grows in my yard. I dont have pm on my cannabis because I foliar feed with it all summer, but I did spray at full strength to see if it would burn a smaller infant plant. There were no ill effect to smaller infant plants. So you mature plant should take it just fine. The ph of the EM-1 is 3.5.
EM-1 is not expensive at all. Check this link...
http://www.teraganix.com/EM-1-Microbial-Inoculant-Microbial-Inoculants-p/1000.htm
Good luck.....

KlipschGuy said:

Spray the leaves with 50 50 ratio milk and water. Enzymes in the milk will take care of it quick. How far are you into bloom? Depending on what week your I'd say your plants look hungry to me man.

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The reason milk works is because of the lactobacillus in the milk... With EM-1 you will not see the white residue left behind from the milk, possibly thinking its more PM, and the possible odor that can also occur.