Mature Palm Watering and White Scale in Southern California

Watering Established Palms

Gardener says minimal water for mature palms 3 miles from coast. Correct—established palms need little supplemental irrigation.

White Powder on Date Palms

Close-up photo shows mealybugs or scale (not powdery mildew).

Treatment

1. Buy horticultural oil (Ultra-Fine, Organocide).
2. Mix per label + ½ tsp dish soap per gallon (improves adhesion).
3. Spray thoroughly, let sit overnight.
4. Next morning, wash off oil and dead insects.
5. Repeat several times at 2-week intervals.

Scale is tough; persistence wins.