My secrets....my secrets....my secrets...all thrown aside for the good of XericWorld....
I've had great success with Merit. It's a systemic, and here's what I do:
(I've only done this with plants in pots, but you could do the same, in theory and with success for in-ground plants.
Place infected plant in water-holding tub or bucket.
Let the plant get REAL thirsty by withholding water til soil is dry. For a 15 gal plant I mix Merit with 2 gallons of water. Pour on plant, letting excess pool in tub or bucket. The dry soil will wick this water up til it's fully hydrated. Repeat this process 3 or 4 times.
For landscape plants, shut off irrigation to infected plant, get it thirsty, and put a 2 gallon bucket with small hole in bottom next to plant. Pour in Merit and water. Water/Merit will slowly leach into ground.
I took some Aloe Peglarae that were ate up with mite and actually submerged them, roots and all, in a 7 gallon tub with Merit for 12 hours.
My friend George says you only need to treat once a year, but I like the scorched earth policy, myself.
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