Need your advice feels like citrus is dieing noticed more leaves with brown spots

Update another cause it might be plant is standing near window now because its already spring. Outside temperatures are still cold around 28F to 41F. And my parents like to open windows and let cold air in. Also i noticed that few leaves edges are brown. I though maybe cold air can cause these problems ?

What should i do to cure plant :(

Thanks for any advise

up
anyone?

Your leaves are nicer looking than mine and my are growing great. I hope you are worried over nothing but just in case spray it with a solution of 1 TBSP of dawn dish washing soap, Neam oil to direction, and 1 TBSP of wet-able sulfur to 1 gallon of water. Did you use a 5-1-1 type mix that people here brag about. If so you will have no problem with wet soggy soil.

I am also curious to your name of clip 3. I backpacked the Appalachian trail in 1990. I used a backpack tent known as a clip3. I was wandering if you to back pack and chose that name after the tent.

Steve

swfx and Steve, Z (6Bground,5B roof) Cincy,OH thank you for your comments

Citrus growing now many new shoots, doesnt look like plant is dying now. :) Brown spots are infected over all plant 4 leaves, after 1 week monitoring every leaf it looks like infection doesnt spread. Brown edges are probably from cold air that i mentioned in previous post.

I have probably found another cause for brown spots. After repoting plant i though that soil is abit too cold and i heated whole pot with electric heater. Probably its Edema that i caused. Roots were at higher temp than the leaves, roots sent additional water to leaves thinking its hot but its not. Is that possible? Need your opinions. Thanks

To Steve

Im not using 5-1-1 mix its quick drying i know its very good but for mine situation in summer i wont be home often so i need slower draining soil. I have chosen potting mix for citrus + added perlite for better air circulation. Watering is strict, i`m writing everytime i water or fertilize the plant. Always checking the soil it its dried enough so it can be watered again.

About the name clip3 i have chosen it randomly after forum moved. :)

Uploading more photos maybe it will help to define whats wrong.
Spots are rusty color, and leaf edges are much lighter color from lower surface of leaf "looks like somebody squashed with hands" These spots seems that not spreading to infected leaves . They are the same as i noticed them about 2 weeks ago.

mikerno_1micha
Nope its not pest issue. No one crawling or crawled up my tree. Plant always stays indoors. Not wetting at all in late Autumn or Winter, just washing once a month leaves from dust. In spring, summer period wetting the leaves when the soil is nearly dry. Never had such problem before.

Also got these on few leaves brown edge. Im 80% sure that its cold air damage. and about brown spots not sure what is it.