The pathogen is showing powdery lesion in lower/adaxial side of the leaf. Physically (see the image), it can be observed that leaf start yellowing from top position of branch and the symptom advances towards lower side and subsequently whole branch dies of. I addition to that, young flowers die immaturely.
either mildew disease or powdery disease ,however it can clear by make slide from these fungi under microscope then i can help you more.
I am not sure but to me it seems like as insect attack...some of leaf-sap succer. It is not my specialization...but ...trie to find it in some entomo -books.
I agree with Huda: I need a slide mount image in order to have a guess. It doesn't look like powdery mildew to me.
In order to know whether the plant leaf is infected with fungus, you should prepare wet mount preparations and examine the slide under light microscope in low and high power. You can easily study microscopic morphology of fungi and algae in PHOL (Pal, Hasegawa, Ono, Lee) stain or Narayan stain, which are developed by us in 1990 and 1998, respectively. You may please take the help of some books on Mycology to study the morphology. Good luck, Prof.Dr.Mahendra Pal Founder Director of Narayan Consultancy on Veterinary Public Health
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