Imidacloprid is for sucking pests mainly, for chewing (like you are facing) use Byren's Belt: http://www.iraq.cropscience.bayer.com/e ... ductslider Its recently banned in America though, and Byren's American webpage had ton of information like detailed 200+ pests and how use Belt on them, so I hope above link will do job for you.
A disease observed in ' Raat ki Rani (Cestrum nocturnum)' and not in anyother plant in garden. This is 2nd plant that got this disease. The other one was also planted here but I had to remove it and started this one fresh but it is also got attacked by the same disease. It has made the plant ugly and highly hampered its ability to flower. Imidacloprid and Polytrin-c of Syngenta are regularly sprayed on this plant as they are sprayed to roses. Members are requested to identify disease and suggest remedy