A pygmy date palm (Phoenix roebelenii), a compact palm for zones 10 and 11, stays healthiest with constant water, full sun, and slightly acidic soil. The problems to watch for are palm leaf skeletonizer, scale, leaf spot, and bud rot.

What do common pygmy date palm problems look like?

Each problem leaves a distinct sign:

• Palm leaf skeletonizer: caterpillars that feed on fronds and can strip a palm bare
• Scale: small insects feeding on the fronds and trunk
• Leaf spot: brown, black, or tan patches with a darker margin, favored by wet, humid spells
• Bud rot: a wilting, discolored spear leaf, the newest central leaf, that may pull free

How are scale and leaf skeletonizer controlled on a pygmy date palm?

A different spray handles each pest. Scale is smothered on contact when the fronds and trunk are coated with Horticultural Oil Insect Spray, mixed at 1:100 for the growing season, while feeding larvae are sprayed with Garden Insect Spray with Spinosad at the first sign of caterpillar activity, staying effective for about 3 to 4 weeks. The oil's listed plants do not name palms.

Should cold damaged fronds be pruned from a pygmy date palm?

No. Pruning cold damaged fronds adds stress and opens the palm to infection, including bacterial bud rot, often linked to cold damage.

How are bud rot and leaf spot treated on a pygmy date palm?

Early, since bud rot is usually fatal, though prompt treatment improves the odds. Where cold has damaged the palm, wetting the terminal bud with Liquid Copper Fungicide Spray to the point of runoff, every 10 to 14 days for 3 to 4 treatments, helps guard against bud rot, and the spray is also listed for leaf spot on date palms.

Frequently Asked Questions

Does palm leaf skeletonizer attack other palms?

Yes. Its recorded hosts include cabbage palms (Sabal palmetto) and coconut palms.

Does overhead watering spread leaf spot?

Yes. Splashing water from rain and irrigation spreads leaf spot pathogens from leaf to leaf, so water aimed at the soil keeps the fronds drier.

Can copper spray harm a patio around a potted palm?

Yes. Copper can react with metal and masonry, and its directions warn against spraying cars, houses, or lawn furniture.

Can the spinosad spray be used in an organic garden?

Yes. It is OMRI approved by the Organic Materials Review Institute for organic gardening.