Anyone have this problem with their outdoor plants.. certian tops in random spots are getting this purple shit.. (its not a temp thing) ive seen multipal threads on the subject but none have nailed it down to a hard answer.. ive had it in past outdoor growa years ago.. starts like this then the leaves start deforming .. i ended up trashing those plants back then.. i would really like to prevent that with these..
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Beet Curly Top Virus (BCTV), named after the beet leafhopper, the insect that transmits the virus.
Cut it out asap, it can spread by contact. Side branches that later develop on the plant are largely symptom-free.
Some plants can overcome it on their own, but not usually.
See pdf for more details.
https://webdoc.agsci.colostate.edu/hempinsects/PDFs/Curly Top Beet Leafhopper 2020.pdf
I've been loving this Bioceres WP for prevention for caterpillars and hoppers, both can't stand the silica clay coating on the leaves. Hoppers and moths won't stay on the plant more than a few seconds.
Mixing Bt into it as well, and the clay dessicates any eggs or mites when it dries, so lots of modes of action going on.
I've been more vigilant about leafhoppers since seeing the spots they bit last year turn in to septoria almost a month later, as well as 2 plants with the purple tops and stunted growth.