Q.A white powder on palm
Was I right cutting all leaves off as person said 2 do? is there a home spray I can use for the part at the top ( new growth)and trunk? I have dogs and don’t want them 2 get poisoned.

A white powdery substance on palm leaves can be the result of insect activity. Before spraying anything, it's important to identify the cause to ensure the treatment will be effective. Whiteflies or mealybugs (a type of scale insect) are the most common causes. Here is how to identify and treat them:
https://www.gardeningknowhow.com/plant-problems/pests/insects/whitefly-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/mealybugs-control.htm
Neem oil is a good treatment for both types of insect:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm