New growth has brown/yellow patches on it

[EnzoP]

Hi guys! Anyone have an idea as to what could be causing these brown/dry/yellow damage spots on the new frond that just opened last week and the new spear of my small Dypsis lutescens? 

I believe the spear is growing at a decent rate for indoors (first emerged last Thursday, 4 inches long today) but it’s not looking good. It even has a tear in it which I’ve never seen before. I have a feeling I may have overfed it as the spear also feels quite tender compared to the previous spear.

Conditions it is in:

- Large south-east facing window but I have to supplement with grow light over winter averaging 1500-2000 foot candles for 12-14 hours

- Temperatures are 21-24 celsius at night and 26-29 celsius during the day

- Humidity is consistently above 60% and have fans running 24/7 not directly on the plant

 

[Philly J]

Minor fungal damage that happened to the spear before it opened.  All good I wouldn’t worry 👍🏻🥰 and it got moved by Kew last year from Dypsis back to its old Chrysalidocarpus genus 😵‍💫 longer genus names are always fun hahaha