Broccoli Plants
Q.

why does my broccoli have a white chalky substance on it?

Zone mn | mjresults added on August 24, 2012 | Answered

We live in MN. Why does my broccoli have a white chalky substance on it? We have an organic garden.

A.
A.Answers to this queston: Add Answer
Nikki
Certified GKH Gardening Expert
Answered on August 27, 2012

If they are chalky, it could be the type of water your are using. It may be mineral deposits building up on the leaves. Watering with a distilled water will stop this.

If they are fuzzy, this is mealybug and this article will help you treat it, as will neem oil, which is safe and effective: https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm

If it's more powdery in nature, then powdery mildew may be the problem. Neem oil will help with this too. Here is more info: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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