What kind of disease is this.......and suggest cure

Yellowing of leaves is a normal aging process before leaf fall. But its too early for that. It is most likely to be a nutrition deficiency. You can do soil analysis and leaf analysis for that. Some chemicals like ethrel, some fungicide could make some leaves yellow. And for fruit dropping, cool climate can extend the June drop period (planofix could help). You can read this. https://web.extension.illinois.edu/cfiv/homeowners/070828.html

Hi Arvind Sharma there are Woolly Aphid at your apple tree. Have a look on the red sign in the picture Click on the green link to get more informations and control measures on the plantix libary.

Thank you for your advise......i have sprayed chloropyriphos 5 days ago....but i need cure for these yellowish leaf.............

Arvind Sharma for this spray sulpher by fmc or coppor oxychloride also work in this if you use coppor just use by fmc or syngenta 3 gm per 1 ltr do not use overdose coppor in high temprature just use 3 gm and if you using sulpher just 5 per 1 ltr of water

Thanks sir........

Arvind Sharma yellow leaf with black spot is marsonina.. You will go for tebuconazole.. For control of wolly apple aphid spray metasystox.. If you spray chlorpyriphos there is problem of mite in orchard...