14 Nov 17 Larry Krieg (Australia - temperate climate)
Try looking up White blister (Albugo candida). I get this is my broccoli at times and it may be what you are observing. There are pictures on the website www.agric.wa.gov.au/broccoli/diseases-vegetable-brassicas?page=0%2C1
Cheers Larry
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This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. GardenGrow is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
We cannot help if you are overrun by giant slugs.