Everything going great and then.....

My outdoor grow was going fantastic until the last couple of weeks when a few problems started to appear. Now I believe that some of the lower fan leaves turning yellow is perfectly normal as the plant uses the stored energy as it starts to flower, however a couple of issues have surfaced leaving me a little baffled as there were no signs of any problems until this relatively late stage of vegetation and early flowering stage. This is my first grow so I am a little unsure how to diagnose these issues. The large burn like lesions i thought could be due to nutrient burn, however no nutrients have been added for quite some time. Plant is watered daily in the evening and overall still looks ok, but concerned the issue will intensify and affect its flowering stage. Also the weird white speckles on the leaves have left me a little confused as once again they have only appeared in the last couple of weeks. Added some photos and any help much appreciated.

im definitely no expert, but the third pic with the white spots looks like bugs. these might help, i reference them often....

https://www.rollitup.org/marijuana-plant-problems/216537-self-diagnose-your-plants.html

https://www.rollitup.org/view.php?pg=faq&cmd=category&id=90

i think the fact that u havent fed for a long time is your problem and/or overwatering

Indeed, you may want to look into watering it a little less, maybe. Or giving it a little light fert.
As for the white spots, do they come off easily, or are they incrusted in the leaves?

i think it would be worth your time to check the PH , are you on a water softener? it will remove mag. the plant needs

Thanks for the replies guys. I´m not using a water softener and the water in this area is fairly hard. Also the white marks are embedded in the leaves kind of like a very fine salt. Gonna give them a splash of fert this evening. With regards to watering, on the few occasions I haven´t watered them in the evening by lunchtime the next day they are wilting quite a bit. I´m in Barcelona, Spain and the temps have been very hot over the last few weeks. Could the wilting during heat also be due to lack of water consumption due to a nutes missing rather than simple heat fatigue. Thanks again.